Fairchild FSDH0265RN, FSDL0165RN, FSDM0265RN, FSDL0365RN, FSDM0565R Design Manual

www.fairchildsemi.com

FPS™Fairchild’s Power Switch for

Switch Mode Power Supply

Design Guide

FPS

Fairchild Semiconductor

™

Design Guide

Building Block
Solutions for
Multi-Market
Applications

FPS™Design Guide

Table Of Contents

What is Fairchild Power Switch FPS™ .......................................................................................................5

FPS™ Integrated Solution .........................................................................................................................6

Green FPS™ – New FPS™ Family.............................................................................................................7

Green FPS™ Features and Advantages......................................................................................................8

Burst Mode Operation .......................................................................................................................9

Frequency Modulation for EMI..........................................................................................................10

Over Load Protection .......................................................................................................................11

FPS™ Core Products..............................................................................................................................12

Complete FPS™ Product Offering Sorted by Output Power.........................................................................13

Typical Applications ..............................................................................................................................14

Examples of Typical Application Circuits .............................................................................................15-26

1W Power Supply with Less Than 100mW Standby Power..................................................................15

Dual Negative Output Non-Isolated Flyback .......................................................................................16

2.5W Single Output Isolated Flyback Using FSD200 with KA431 Reference .........................................17

10W Single Output Isolated Flyback Using FSDM0265R and Zener Diode ...........................................18

10W Multiple Output Isolated Flyback Using FSD210 with Primary Side Regulation ...............................19

5W Buck Converter Using FSDL0165RN ...........................................................................................20

16W Multiple Output Isolated Flyback Converter Using FSDM0265RN.................................................21

180W–200W KA5Q1265RF Quasi-resonant Flyback with Input Power

Factor Correction Using FAN7527B/FQP13N50C.........................................................................22-23

40W Isolated Flyback Power Supply

.................................................................................................24

24W Single Output 48V DC/DC Flyback Converter ...........................................................................25

Secondar

y Side Synchr

onous Rectification in a Power Over Ethernet Application ...................................26

Design Tools .........................................................................................................................................27

Ordering Guide ....................................................................................................................................28

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3

FPS™Design Guide

What is Fairchild Power Switch (FPS™)

When you plug into a power receptacle anywhere in the world, more than likely the plug you are holding links
you to an off-line AC to DC power converter. The heart of today’s off-line converter is an integrated circuit (IC)
that not only contains the Pulse Width Modulation (PWM) circuitry and a power MOSFET converter that is
required for efficient conversion from AC to DC but also integrates a myriad of control and protection circuitry
that makes yesterday’s off-line converters bulky by comparison. Fairchild Power Switch (FPS™) is a family of
products that combines the avalanche rugged power SenseFET with state-of-the-art PWM circuitry to address a
variety of Switch Mode Power Supplies (SMPS).

An FPS™ IC contains protection against excessive heating within the converter, overloading of any DC output,
excessive currents that could damage the power MOSFET and excessive voltage of controlled DC output. These
necessary protection features are combined with advanced control features such as burst mode operation for
low standby power, a precision oscillator with frequency modulation to minimize EMI, and soft start.

Fairchild offers two design approaches:

1) Parallel dice, with SenseFET and PWM die side-by-side in one package,

2) Single die, monolithic design

The choice of these approaches allow cost-effective designs for a broad range of applications that include
chargers, adapters, set top boxes, VCR, DVD players, LCD and CRT TVs, LCD and CRT monitors, white goods,
PCs, notebooks and assorted household appliances.

The integration level is optimal and minimizes component count and saves board space. The FPS™ concept
provides cost-effective solutions for Flyback and Forward Converter topologies with outstanding reliability.

Combined with years of manufacturing expertise, these state-of-the-art off-line power switching solutions provide
the designers with the ability to do rapid production ramp-ups of their advanced SMPS design.

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5

FPS™Design Guide

+

–

~~

AC

Input

Vo

Softstart

Frequency
Setting

Current
Sensing

MOSFET
Drive

PWM

Controller

Startup
Resistor

MOSFET

UC3842

Comp

Vref

RtCt

Isense

Vfb

Vcc

Out

GND

FPS™ Integrated Solution

Optimally Integrated Solution for Off-Line Switch Mode Power Supplies

• Integrated features in a single package

– SenseFET

– PWM controller

– Gate drive circuit

equency oscillator

ecise fr

– Pr

• Additional functions

– Startup circuit with soft start

– Frequency modulation

– Burst operation

• Protection function

– Over load protection

– Over voltage protection

– Over current protection

ent limit

– Pulse by pulse cur

– Over temperature protection

r

6

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Green FPS™ – New FPS™ Family

Output Power GreenFPS™

Additional Features Application Example

Level Part Number

Low Power FSD200 Self biasing (FSD200) Charger

FSD210 Frequency modulation Auxiliary supply (for small display or controller

FS

DM311 Burst mode

boards in white goods for example)

FS

DL312 Built-in startup

Soft start

Medium Power

FSD1000 Auxiliary supplies PC main supply and PC auxiliary supply

(FPS with main power PWM integrated)

Burst mode

Programmable soft start

Internal startup

FS

DL0165RN Frequency modulation DVD player and auxiliary supply

FS

DH0265RN Built-in startup DVD player

FS

DM0265RN Soft start Digital Still Camera (DSC)

FSDL0365RN Burst mode DVD R/W

FSDM0365RN Programmable current limit LCD monitor

Digital Still Camera (DSC)

Set top box

FSDM0565R Bulit-in startup LCD monitor

FSDM07652R Soft start Notebook adapter

Burst mode Set top box

High Power FSCQ0765RT* Burst mode Color TV

FSCQ15658RT* Reducing IC current DVD receiver

Maximum frequency limit Plasma display panel

Soft start with fast settling

* Product in development

FPS™Design Guide

Green FPS™ is a New Family of FPS™ Products:

• Used in low standby power applications that meet the less than
att standar

1 W

• Suppor

• Integrated solution of multiple protection and control features built with the power

www

ts envir

switch MOSFET available in a very small package

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ds (i.e. EnergyStar)

onmentally friendly systems

7

FPS™Design Guide

Snubber

Circuit

Load

+

+

++

Feedback
Circuit

Control

IC

FPS™

FPS™ Parallel Dice Solution

(Side-by- Side)

GNDVccIpk FB

Drain

Drain

Vstr Drain

SenseFET

PWM

IC

FPS™ Single Die Solution

(BCDMOS)

GND

GNDVFB GND

Vstr

Drain

Vcc

Green FPS™ Features and Advantages

Simplified Application Cir

cuit for FPS

™

Featur

es

• Optimal Solution for Off-Line SMPS

• Integrated Avalanche Rugged SenseFET

• Pulse-by-Pulse Current Limiting

• Various Protection Functions
(Over Voltage, Over Load, Over
Current, Thermal Shutdown)

• Burst Mode Operation for Low
Standby Power

• Frequency Modulation for Reduced EMI

• Soft Start Function

• Operation Fr

equency Options

(50/70/100/134kHz)

• External Frequency Synchronization

• Quasi Resonant

Advantages

• Low Standby Consumption with Burst Mode Operation

• Fully Avalanche Rugged, 650V and 800V SenseFETs Improves Reliability

Reduced EMI with Fully Integrated Frequency Modulation

•

• Reduces the Total Bill-of-Materials Cost with Integrated Protection and Control Functions

oad Application Coverage with Extensive Exper

• Br

tise and Easy-to-Use Design T

8

ools

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FPS™Design Guide

Current

Waveform

Feedback

Waveform

Burst

Operation

Normal Operation

Not

Switching

Not

Switching

V

BURSTH

V

BURSTL

standby normal

standby normal

Burst Operation @ 85VAC Burst Operation @ 265VAC

Green FPS™ Feature – Burst Mode Operation

(Refer to schematic in Typical Application Circuit 40W Isolated Flyback Power Supply on page 24)

• In standby mode, outputs draw very little to no load current

• Output voltages increase causing the feedback voltage to decrease

• When the feedback voltage goes below VBURSTL threshold, switching stops in the FPS device
saving considerable power

• Depending on load current, the output voltages will eventually fall causing the feedback voltage to increase

• Once the feedback voltage crosses VBURSTH threshold, switching starts again

• A 5V output FSD210 board at 265V in no load standby consumes a mere 92mW

Below shows the waveforms of both normal and standby modes at the voltage extremes for the universal
voltage range.

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FPS™Design Guide

130kHz

131kHz

132kHz

133kHz

134kHz

135kHz

136kHz

137kHz

138kHz

2mS

A

B

C

130kHz134kHz

138kHz

Sawtooth

Waveform

Ton

Vfb

Vdrain

Idrain

A

B

C

100kHz Fixed Frequency

FSDH0165

134kHz with Frequency Modulation

FSD210

Peak Level Limit

Peak Level Limit

Peak Waveform

Quasi Peak Waveform

Green FPS™ Feature – Frequency Modulation for EMI

• Fixed frequency oscillators generate Electromagnetic
Interference (EMI) in a narrow band of the frequency spectrum

• Fairchild’s latest FPS devices modulate its frequency over a
±4kHz frequency range

• EMI is thus spread over a wider range of frequencies

• Allows simple EMI filters to be employed for meeting world
wide EMI requirements

• Refer to Application Note AN-4145 Electromagnetic
Compatibility for Power Converters for additional information

Below shows the frequency spectrum waveforms of a fixed frequency device versus a device that employs

equency modulation.

fr

10

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FPS™Design Guide

Shutdown

V

SD

V

t

t1

t2

Time Constant t2 =
(Cfb * (V

SD

-3V))/5uA

0

3V

OSC.

5uA

250uA

2.8R

R

Voffset

S

R

Q

Vck

FB

Vfb*

V

SD

S

Q

R

Vo

Cfb

Thermal

Shutdown

Reset

Shutdown

Secondary Side

LEB

Over Load Protection and

Auto-Restart @ 265VAC

Feedback Over Load

Protection Level @ 265VAC

Green FPS™ Feature – Over Load Protection

• Consider the load current increasing significantly in this overload scenario.

• The FPS increases its duty cycle within the limits of its pulse-by-pulse current limit.

• The output voltage falls and the feedback voltage rises in response.

• If it is just a momentary surge, then the output will rise after the surge and the feedback voltage will
resume its steady state.

• However, if it is not a surge, for example; if output is shorted to ground, then feedback voltage continues to rise.

• At 3V, the feedback voltage is pulled up with a small internal 5

µA current, allowing for adjusting the delay

as shown above.

• When the feedback voltage crosses the over load shutdown (VSD) threshold, the FPS stops switching.

• With the FPS not switching, bias current is not supplied to the FPS supply (VCC) storage capacitor.

• When the VCC voltage reaches its "under voltage lock out" threshold, the FPS is automatically restarted.

• The cycle will repeat until the fault is removed, providing a quick recovery from the overload condition to
normal operation.

Below are waveforms showing the over load protection and auto-restart occurring repeatedly for a static fault
condition and a close-up of the feedback voltage showing when the over load pr

otection is triggered and

switching stops.

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11

FPS™Design Guide

FPS™Core Products

Product/Function

t Typical Output Power Output Power Peak Current Drain Voltage Static Drain Source Switching Packages

Par
Number Applications (85 – 265Vac) (230Vac) ±15% Limit MAX On Resistance MAX Frequency

(W) (W) (A) (V) (Ω) (kHz)

FSD200 Charger 4.8 7.2 0.3 700 32 134 DIP-7L

FSD210 Charger 4.8 7.2 0.3 700 32 134 DIP-7L

FSDM311

FSD1000 PC 12.0 13.6 Adjustable 700 9 70 DIPH-12L

FSDL0165RN DVDP/STB 12.0 13.6 1.2 650 10 50 DIP-8L

FSDL312 PC Aux 12.0 13.6 1.2 650 10 50 DIP-8L

FSDM0265RN DVDP/STB 16.0 18.4 1.5 650 6 67 DIP-8L

FSDH0265RN DVDP/STB 16.0 18.4 1.5 650 6 100 DIP-8L

FSDL0365RN DVDP/STB 24.0 28.0 2.2 650 4.5 50 DIP-8L

FSDM0365RN DVDP/STB 24.0 28.0 2.2 650 4.5 67 DIP-8L

FSDM0565R LCD Monitor 48.0 56.0 2.3 650 2.2 67 TO-220F-6L

FSDM07652R LCD Monitor 60.0 68.0 2.5 650 1.6 67 TO-220F-6L

FS7M0680 PDP, PC 64.0 80.0 4.0 800 2.0 67 TO-3P-5L

FS7M0880 PDP, PC 88.0 104.0 5.0 800 1.5 67 TO-3P-5L

FS8S0765RCB CRT Monitor 64.0 80.0 4.0 650 1.6 sync TO-220-5L

FS8S0965RCB CRT Monitor 96.0 116.0 6.0 650 1.2 sync TO-220-5L

FS6S1265RE CRT Monitor 128.0 152.0 8.0 650 0.9 sync TO-3P-5L

FS6S1565RB CRT Monitor 160.0 192.0 9.7 650 0.65 sync TO-3P-5L

KA5Q0765RTH C-TV 80.0 104.0 5.0 650 1.6 QRC TO-220F-5L

KA5Q1265RF C-TV 160.0 184.0 8.0 650 0.9 QRC TO-3PF-5L

KA5Q1565RF C-TV 216.0 240.0 11.5 650 0.65 QRC TO-3PF-5L

PC Aux 7.2 7.2 0.6 650 19 67 DIP-8L

Function

Control Feature/Protection Mode

Control Feature Protection Mode

Part Soft Frequency Green FPS
Number Start Modulation Family Winding Mode Protection Shutdown Protection Protection Lock Out

FSD200 Internal Soft Start Yes Yes Not Needed Voltage Auto Restart Auto Restart No No No

FSD210 Internal Soft Start Yes Yes Needed Voltage Auto Restart Auto Restart No No Yes

FSDM311 Internal Soft Start No Yes Needed Voltage Auto Restart Auto Restart No Auto Restart Yes

FSD1000 Internal Soft Start No Yes Needed Current/Voltage Auto Restart Auto Restart No Latch Yes

FSDL0165RN Internal Soft Start Yes Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FSDL312 Internal Soft Start Yes Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FSDM0265RN Internal Soft Start Yes Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FSDH0265RN Internal Soft Start Yes Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

es Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

Y

No

t

t

No

No

nal Soft Star

FSDL0365RN

FSDM0365RN Internal Soft Start Yes Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FSDM0565R Internal Soft Start No Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FSDM07652R

FS7M0680 Soft Start No No Needed Current Latch Latch Latch Latch Yes

FS7M0880 Soft Start No No Needed Current Latch Latch Latch Latch Yes

FS8S0765RCB Soft Start No No Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FS8S0965RCB Soft Start No No Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

FS6S1265RE

FS6S1565RB

KA5Q0765RTH No No No Needed Current Auto Restart Latch Latch Auto Restart Yes

KA5Q1265RF

KA5Q1565RF No No No Needed Current Auto Restart Latch Latch Auto Restart Yes

Inter

nal Soft Start No Yes Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

Inter

Soft Star

Soft Start No No Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

™

Bias Feedback Over Load Thermal Over Current Over Voltage Under Volt.

No

No Needed Current Auto Restart Latch Latch Auto Restart Yes

Needed Current Auto Restart Auto Restart Auto Restart Auto Restart Yes

12

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FPS™Design Guide

Complete FPS™Product Offering Sorted By Output Power

Function

t Recommended Typical Output Power Output Power Peak Current Drain Static Drain Source Switching Packages

Par
Number

0 to 10W Output Power Range

FSD200 Charger 4.8 7.2 0.3 700 32 134kHz DIP-7L
FSD210 Charger 4.8 7.2 0.3 700 32 134kHz DIP-7L
FSDH0165D FSDM311 Charger 7.2 7.2 0.5 650 18 100kHz DIPH-8L
FSDM311 PC Aux 7.2 7.2 0.6 650 19 67kHz DIP-8L
KA5H0165RN FSDL0165RN Charger Aux 8.0 8.0 0.6 650 10 100kHz DIP-8L
KA5L0165RN FSDL0165RN Charger Aux 8.0 8.0 0.6 650 10 50kHz DIP-8L
KA5M0165RN FSDL0165RN Charger Aux 8.0 8.0 0.6 650 10 67kHz DIP-8L

10 to 50W Output Power Range

FSD1000 PC 12.0 13.6 Adjustable 700 9 70kHz DIPH-12L
FSDL0165RN DVDP/STB/VCR 12.0 13.6 1.2 650 10 50kHz DIP-8
FSDL312 PC Aux Power Supply 12.0 13.6 1.2 650 10 50kHz DIP-8L
KA5H0165R FSDH0265RN Charger Aux 12.0 12.0 0.6 650 10 100kHz TO-220F-4L
KA5H02659RN FSDH0265RN Aux Power Supply 12.0 13.6 0.9 650 6 100kHz DIP-8L
KA5L0165R FSDM0265RN Charger Aux 12.0 12.0 0.6 650 10 50kHz TO-220F-4L
KA5M0165R FSDM0265RN Charger Aux 12.0 12.0 0.6 650 10 67kHz TO-220F-4L
KA5M02659RN FSDM0265RN Aux Power Supply 12.0 13.6 0.9 650 6 67kHz DIP-8L
FSDH0265RN DVDP/STB/VCR 16.0 18.4 1.5 650 6 100kHz DIP-8L
FSDM0265RN DVDP/STB/VCR 16.0 18.4 1.5 650 6 67kHz DIP-8L
KA5H0265RC FSDM0365RN Aux Power Supply 20.0 24.0 1.2 650 6 100kHz TO-220-5L
KA5H0280R DVDP/STB/VCR 20.0 24.0 1.2 800 7 100kHz TO-220F-4L
KA5L0265R FSDL0365RN Aux Power 20.0 24.0 1.2 650 6 50kHz TO-220F-4L
KA5L0365RN FSDL0365RN DVDP/STB/VCR 20.0 24.0 2.2 650 4.5 50kHz DIP-8L
KA5M0265R FSDM0365RN Aux Power Supply 20.0 24.0 1.2 650 6 67kHz TO-220F-4L
KA5M0280R DVDP/STB/VCR 20.0 24.0 1.2 800 7 67kHz TO-220F-4L
KA5M0365RN FSDM0365RN DVDP/STB/VCR 20.0 24.0 2.2 650 4.5 67kHz DIP-8L
FSDL0365RN DVDP/STB/VCR 24.0 28.0 2.2 650 4.5 50kHz DIP-8L
FSDM0365RN DVDP/STB/VCR 24.0 28.0 2.2 650 4.5 67kHz DIP-8L
KA5H0365R DVDP/STB/VCR 32.0 40.0 2.2 650 4.5 100kHz TO-220F-4L
KA5H0380R DVDP/STB/VCR 32.0 40.0 2.2 800 5 100kHz TO-220F-4L
KA5L0365R DVDP/STB/VCR 32.0 40.0 2.2 650 4.5 50kHz TO-220F-4L
KA5L0380R DVDP/STB/VCR 32.0 40.0 2.2 800 5 50kHz TO-220F-4L
KA5M0365R DVDP/STB/VCR 32.0 40.0 2.2 650 4.5 67kHz TO-220F-4L
KA5M0380R DVDP/STB/VCR 32.0 40.0 2.2 800 5 67kHz TO-220F-4L
FSDM0565R LCD Monitor 48.0 56.0 2.3 650 2.2 67kHz TO-220F-6L

50 to 100W Output Power Range

FSDM07652R LCD Monitor 60.0 68.0 2.5 650 1.6 67kHz TO-220F-6L
FS6M12653RTC LCD Monitor 64.0 76.0 3.2 650 0.9 70kHz TO-220F-5L
KA5M0765RQC FSDM07652R LCD Monitor 80.0 96.0 5.0 650 1.6 67kHz TO-220-5L
FS7M0680 Plasma Display, PC 64.0 80.0 4.0 800 2.0 67kHz TO-3P-5L
KA5P0680C PC 64.0 80.0 4.0 800 2 Adjustable TO-220-5L
FS7M0880 Plasma Display, PC 88.0 104.0 5.0 800 1.5 67kHz TO-3P-5L
KA5M0965Q LCD Monitor 96.0 116.0 6.0 650 1.2 67kHz TO-3P-5L

60-160W Output Power Range

FS6S0765RCH FS8S0765RCB CRT Monitor 64.0 80.0 4.0 650 1.6 sync TO-220-5L
FS6S0965R FS8S0965RCB CRT Monitor 96.0 116.0 6.0 650 1.2 sync TO-3P-5L
FS6S0965RCB FS8S0965RCB CRT Monitor 96.0 116.0 6.0 650 1.2 sync TO-220-5L
FS8S0765RCB CRT Monitor 64.0 80.0 4.0 650 1.6 sync TO-220-5L
FS8S0965RCB CRT Monitor 96.0 116.0 6.0 650 1.2 sync TO-220-5L
FS6S1265RE CRT Monitor 128.0 152.0 8.0 650 0.9 sync TO-3P-5L
FS6S1565RB CRT Monitor 160.0 192.0 9.7 650 0.65 sync TO-3P-5L

50-220W Output Power Range

KA5Q0565RT C-TV 56.0 64.0 3.5 650 2.2 QRC TO-220F-5L
KA5Q0740RT C-TV 80.0 5.0 400 1.1 QRC TO-220F-5L
KA5Q0765RTH C-TV 80.0 104.0 5.0 650 1.6 QRC TO-220F-5L
KA5Q12656RT C-TV 120.0 144.0 6.0 650 0.9 QRC TO-220F-5L
KA5Q1265RF C-TV 160.0 184.0 8.0 650 0.9 QRC TO-3PF-5L
KA5Q1565RF C-TV 216.0 240.0 11.5 650 0.65 QRC TO-3PF-5L
FSCQ0765RT* C-TV 80.0 104.0 5.0 650 1.6 QRC TO-220F-5L
FSCQ15658RT* C-TV 160.0 184.0 8.0 650 0.65 QRC TO-220F-5L

48V DC/DC Flyback Converter

FS6X1220RT DC/DC Off-line 3.2 200 0.3 300kHz TO-220F-5L
FS6X1220RD* DC/DC Off-line 3.2 200 0.3 300kHz D2-PAK-5L

* In development

Replacement Applications (85-265Vac) (230Vac) ±15% Limit Voltage MAX on Resistance Frequency

(W)

(W) (A) (V) MAX (

Ω)

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FPS™Design Guide

80–250W

Output Power Range

50–100W

Output Power Range

10–50W

Output Power Range

0–12W

Output Power Range

FSCQ0765RT
FSCQ1265RT
FSCQ1565RT

FSD200
FSD210
FSDL312
FSD1000
FDSH321
FSDM311

FSDM0565R
FSDM07652RB

FSDH0265RN
FSDL0165RN
FSDL0365RN
FSDM0365RN
FSDM0265RN

Typical Applications

14

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Examples of Typical Application Circuits

85V-265VAC input

Lp = 1200uH 94/9/2 EF13 (on Vogt Fi324 core)

9V/100mA output

fsw=134kHz

1

2

VCC

5

DRAIN

7

VSTR

8

GND1GND2GND3VFB

4

3

1

4

5

6

1
2
3
4

CONN1

B2P3-VH

FS1

230V/250mA

R201
100R

0.125W

R105

10R

0.125W

R202
470R

0.125W

D201

EGP10D

R100

L100

C100
10uF
400V

C101
10uF
400V

C103

4.7uF
63V

C104
47uF
50V

+

L101

IC1
FSD210

M

D105

FDLL4148

T1

EF13 VOGT 6PIN

+

R101

Q1

BC847B

D202
BZX84C9

0.35W

C201
220uF
25V

+

D103
P6KE150A
Pm = 600W

D102
UF4007

+

CONN2
B4B-XH-A

D101

1N4007

1W Power Supply with Less Than 100mW Standby Power

Typical Application – Small home or factory automation appliances

FPS™Design Guide

This compact non-isolated flyback solution draws less than 100mW standby power over the whole input voltage range. This example
shows a 9V output system. Here the FSD210 is powered from an auxiliary winding rather than directly from the high voltage bus.
For output voltages of 12V and over, the device may be powered directly from the output winding. A low cost Zener diode circuit
provides the regulation reference.

• Less than 100mW standby power
– Ideal for applications permanently connected to an AC supply

• Overload protection circuit distinguishes between temporary and permanent overload
– Device does not shut down during load surge conditions
– Inherent short circuit protection

• Frequency modulation reduces EMI reduction circuitry
– Low cost, compact solution possible

Fairchild Devices Description

FSD210M Fairchild Power Switch (0.3A/134kHz)
P6KE150A Transient Voltage Suppressor (600W/150V)
EGP10D
BZX84C9 Zener Diode (9V)

Fast Recover

y Diode (1A/200V)

UF4007 Fast Recovery Diode (1A/1000V)
1N4007
FDLL4148 General Purpose Diode (10mA/100V)
BC847B General Purpose Transistor

General Purpose Diode (1A/1000V)

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15

FPS™Design Guide

85V-265VAC from appliance
input filter stage

Lp = 1500uH 100/11/10 EF13 (on Vogt Fi324 core)

Pin 3: Mains Ground
Pin 2: -5V/300mA
Pin 1: -12V/100mA

-5V/300mA, -12V/100mA output

fsw = 134kHz

1

2

VCC

5

DRAIN

7

VSTR

8

GND1GND2GND3VFB

4

3

1

4

5

6

1

2

3

CONN1

B2P3-VH

R201
100R

0.125W

D201

EGP10D

R100

L100

C100
10uF
400V

+

FS1

230V/250mA

D101

1N4007

C103
47nF
63V

D211

EGP10D

IC1
FSD200

M

T1

EF13 VOGT 6PIN

CONN2
B3P-VH

C201
220uF
25V

+

D106

FDLL4148

Q1

BC847B

D202
BZX84C5V1

0.35W

R202
470R

0.125W

L101

C101
10uF
400V

+

D103
P6KE150A

D102
UF4007

C104
1uF
50V

+

C211
220uF
25V

+

D100

1N4007

R101

Examples of Typical Application Circuits

Dual Negative Output Non-Isolated Flyback

Typical Application – Home appliance control board power supply

A dual non-isolated flyback is used to generate voltages which are negative with respect to the neutral power line. This is used in
applications where triacs are driven, such as in household appliances. A Zener diode, a bipolar transistor and a diode allow the
negative voltage to be regulated by the FPS™. The dual input diode helps to protect against line transients.

• Generation of two negative outputs referred to the input line

• High switching frequency reduces the required inductance

• Frequency modulation reduces EMI reduction circuitry

Fairchild Devices Description

FSD200M Fairchild Power Switch (0.3A/134kHz)
P6KE150A
EGP10D Fast Recovery Diode (1A/200V)
BZX84C5V1 Zener Diode (5.1V)
UF4007 Fast Recovery Diode (1A/1000V)
1N4007 General Purpose Diode (1A/1000V)
FDLL4148 General Purpose Diode (10mA/100V)
BC847B General Purpose Transistor

– Useful for applications using triacs

– More compact, lower cost core

– Split 400V input capacitor and input inductor sufficient in most cases

essor (600W/150V)

16

oltage Suppr

ransient V

T

childsemi.com/fps

.fair

www

Examples of Typical Application Circuits

24V/100mA output

Lp=1700uH 100/25 EF20 (on Vogt Fi324 core)

85V-265VAC from appliance
input filter stage

fsw=134kHz

1

4

8

5

1

2

VCC

5

DRAIN

7

VSTR

8

GND1GND2GND3VFB

4

1
2

2 3

1

1

23

4

FS1
230V/250mA

C206
33nF

50V

C104
33nF
50V

T1

VOGT EF20

D201

SB180

R101

C102

2.2nF
1000V

C300
YCAP
250V

R201
1K

0.25W

D100

1N4007

C101
10uF
400V

+

CONN1

B2P3-VH

R202
1K

0.25W

IC1
FSD200

M

C103
1uF
50V

+

R203

3K

0.25W

R204
91K

0.25W

CONN2

B2P-VH

L100

IC3
KA431LZ

IC2

H11A817A.W

D102
UF4007

D101

1N4007

R102
100K

0.6W

R205
11K

0.25W

C201
100uF
50V

+

C100
10uF
400V

+

L101

2.5W Single Output Isolated Flyback Using FSD200 with KA431 Reference

Typical Application – Isolated main or standby power supplies for household appliances

FPS™Design Guide

In this converter, isolation is provided by the transformer and the H11A817A optocoupler. Output accuracy is improved using the
KA431 voltage reference. The values R201, R203, C206, R204 and C104 set the closed loop control parameters and performance.
Using a Schottky diode is a cost-effective method of improving efficiency where needed.

• Feedback circuit using KA431 reference and H11A817A optocoupler
– More accurate regulation over line, load and temperature than with a Zener diode

• Schottky diode used in output stage
– Cost-effective means of improving efficiency

• Integrated soft start function
– Prevents power surges during switch-on time

Fairchild Devices Description

FSD200M Fairchild Power Switch (0.3A/134kHz)
KA431 2.5V Reference (2.5V)
H11A817A
SB180 Schottky Diode (1A/80V)
UF4007 Fast Recovery Diode (1A/1000V)
1N4007 General Purpose Diode (1A/1000V)

www

childsemi.com/fps

.fair

Transistor Optocoupler

17

FPS™Design Guide

85V-265VAC input

5V/2A output

Lp = 2400uH 114/9/4 EF20 (on Vogt Fi324)

fsw = 70kHz

1

2

8

63

4

1

2

1

23

4

VStr

5

Drain7Drain

8

GND

1

Vcc

2

VFB

3

Drain

6

Ipk

4

1
2
3
4

C101
22uF
400V

+

R103
10R

0.6W

L100

C202
220uF
50V

+

T1

VOGT EF20

CONN101

B2P3-VH

R104

4.7K

0.6W

IC2

H11A817A.W

C300

Y1

R201
120R

0.6W

R102
100k
2W

D104

1N4007

D101

1N4007

D102

1N4007

L101

L201

2.7uH

D106
1N4148

FS101

230V/3A

R101

C103

2.2nF
1000V

D103

1N4007

IC1
FSDM0265RN

D202

BZX84C

3V9

0.5W

C102
22uF
400V

+

C201
220uF
50V

+

C105
1uF
50V

D105
UF4007

C104
100nF
50V

CONN201

B4P-VH

D201

SB540

Examples of Typical Application Circuits

10W Single Output Isolated Flyback Using FSDM0265RN and Zener Diode

Typical Application – Power bricks and single-phase frequency inverters

The FSDM0265RN contains a PWM controller and a MOSFET on two different chips. The 650V MOSFET is fully avalanche rated
and tested which leads to increased system reliability. This application shows a cost reduced feedback circuit using a Zener diode.
R104 is used to reduce the current limit. Higher power parts in the green FPS™ family have a higher current limit and a lower R
than the lower power parts. Using a lower R

part increases the efficiency, particularly at low input voltages. So replacing a low

DS(on)

power part with a high power part increases the efficiency but also the current limit. If it were not possible to reduce the current limit,
the flyback transformer would have to be rated at the higher current limit, making it more expensive.

• FSDM0265RN has a fully avalanche rated MOSFET
– Robust performance under transient conditions

• Overload protection circuit distinguishes between temporary and permanent overload
– Device does not shut down during load sur

ge conditions

– Inherent short circuit protection

• Current limit may be lowered using an external resistor
– Increased flexibility in choice of range of FPS™ parts

Fairchild Devices Description

FSDM0265RN Fairchild Power Switch (1.5A/70kHz)
BZX84C3V9 Zener Diode (3.9V)
H11A817A Transistor Optocoupler
SB540
UF4007 Fast Recovery Diode (1A/1000V)
1N4007 General Purpose Diode (1A/1000V)
1N4148

Schottky Diode (5A/40V)

General Purpose Diode (10mA/100V)

18

www

.fair

DS(on)

childsemi.com/fps

Examples of Typical Application Circuits

195V-265VAC input

10W output

Lp = 2200uH EF20 (on Epcos N67 core)

Primary 81 turns

Vcc 7 turns

5V 3 turns

3.3V 2 turns

12V 9 turns

22V 11 turns

VFD 2 turns

fsw = 134kHz

Vcc

5

DRAIN

7

VSTR

8

GND1GND2GND3VFB

4

1

2

12

11

10

9 5

4

6

2

1

7

8

3

D15

1N4007

L1

2.2mH

0.09A

C14
100nF
50V

D17
12V

C11

22nF

50V

C9
100uF
16V

+

D8

1N4148

C5
10uF
50V

+

D2

1N4007

L2

2.2mH

0.09A

C7

4.7uF
400V

+

FS1
230V/1A

D1

1N4935

D5
BA159

R10
120R

D14

1N4007

D16

SB140

C2
22uF
35V

+

D6

1N4007

L3 FERRITE BEAD

C15
10uF
16V

+

IC1

FSD210M

Q4

BC546B

PL3

B2P3-VH

C8
1uF
50V

D3

P6KE200

C12
100uF
16V

+

D12

10V

0.5W

D9

1N4148

D7

12V

C13
100uF
16V

+

D13

SB140

C6

4.7uF
400V

+

D10

1N4935

C4
10uF
16V

+

TR1

EF20 EPCOS 12Pin

R11

560R

R3

68R

R101

R2

100R

C10

33nF

50V

C3
100nF
50V

C1

2.2nF
Y1

R1

100R

D4

1N4935

0

0

0

0

0

0

0

0

+3.3V/0.5A

+12V/50mA

FL2/VFD

FL1/VFD

+12VA/50mA

+5V/0.5A

-22V/50mA

-12VA/50mA

10W Multiple Output Isolated Flyback Using FSD210 with Primary Side Regulation

Typical Application – Set top boxes, decoders and small DVD players

FPS™Design Guide

Multiple output flyback converters are used in applications where power is supplied to diverse sub-systems such as drives, tuners,
audio stages and complex processor and logic circuits. Primary side regulation is used in this circuit to reduce the total cost. For this
power level and above it is more cost effective to use four diodes in a full bridge configuration than a single diode with a larger
capacitor. For high current outputs it is recommended to use a Schottky diode on the secondary side.

• Primary side regulation reduces system cost
– Cross regulation is good, total regulation worse than with an optocoupler solution

• Frequency modulation approach minimizes EMI circuitry
– Common-mode choke can be replaced by a simple dual capacitor, dual low cost inductor circuit

• Overload protection circuit distinguishes between temporary and permanent overload
– Device does not shut down during load sur

ge conditions fr

om drive unit

– Inherent short circuit protection

Fairchild Devices Description

FSD210M
BZX84Cxx Zener Diodes (10V, 12V)
P6KE200 Transient Voltage Suppressor (600W/200V)
SB140 Schottky Diode (1A/40V)
1N4935 Fast Recovery Diode (1A/200V)
1N4937
UF4007 Fast Recovery Diode (1A/1000V)
1N4007 General Purpose Diode (1A/1000V)
1N4148
BC546B General Purpose Transistor

www

childsemi.com/fps

.fair

Fairchild Power Switch (0.3A/134kHz)

Fast Recover

General Purpose Diode (10mA/100V)

y Diode (1A/600V)

19

FPS™Design Guide

Vout 15V/300mA

Vin 120Vdc-385Vdc

1

2

VStr

5

Drain

7

Drain

8

GND

1

Vcc

2

VFB

3

Drain

6

ILim

4

1

2

C201

4.7uF
50V

+

Q200
BC337-25

CONN1

B2P3-VH

R205
470R

0.25W

L210

820uH

0.3A

C104
22nF
50V

D102
UF4004

D200
15V

0.5W

R104
5K1

0.25W

D210

UF4004

IC1
FSDL0165RN

C211

4.7uF
50V

+

C101
22uF
400V

+

CONN2

B2P-VH

R204
100R

0.25W

Examples of Typical Application Circuits

5W Buck Converter Using FSDL0165RN

Typical Application – Industrial automation, household appliances, instrumentation

Buck converters are ideal in low power applications where a single non-isolated power output is required. The FSDL0165RN buck
circuit was measured to have an excellent efficiency of over 77% for 15V/100mA, 15V/200mA and 15V/300mA levels over the
input voltage range. Buck circuits need a minimum load. This circuit was measured to have a power consumption of less than
350mW with a 15V/10mA output load. The low 50kHz switching frequency option helps to keep the switching losses low. Voltage
accuracy was measured to be around ±6% over line, load and temperature for one board. The fully avalanche rated MOSFET
provides additional robustness against voltage transients needed in those industrial applications where buck converters are commonly
used. The current mode control simplifies the feedback control circuit which supports both discontinuous and continuous current
modes. The device's frequency scaling helps to reduce the EMI caused by the switching.

Buck conver

•

ter using FSDL0165 has high efficiency and low standby power

– Ideal replacement for 50Hz transformer solutions

• FSDL0165RN has a fully avalanche rated MOSFET
– Robust performance under transient conditions
Current mode control maximizes operating flexibility

•
– Low component count for feedback control circuit
– Same circuit operates in DCM and CCM

nal soft star

t featur

e helps

• Current limit may be lowered using an external resistor

• Good control of start-up surge
– Inter

• Frequency modulation helps to reduce EMI
– Cost saving in external filter circuit

Fairchild Devices Description

FSDL0165RN Fairchild Power Switch (1.2A/50kHz)
BZX84C15 Zener Diodes (15V)
UF4004 Fast Recovery Diode (1A/400V)
BC337-25 General Purpose Transistor

20

www

.fair

childsemi.com/fps

Examples of Typical Application Circuits

85V-265VAC input

16W output

Lp = 1000uH EF25 (on Vogt Fi324 core)

Primary 80 turns
Vcc 14 turns
5V 6 turns

3.3V 4 turns

6.6V 8 turns
12V 14 turns

1

6

7

8

9

10

5

3

4

VIN

3

GND

1

VOUT

2

-~

~

+

VStr

5

Drain7Drain

8

GND

1

Vcc

2

VFB

3

Drain

6

ILim

4

1

2

VIN

3

GND

1

VOUT

2

1

23

4

2 3

1

C11
220uF
16V

+

R201
220R

0.6W

T1

C7
1000uF
16V

+

D103
1N4148

R110

D12

SB360

L3

56uH

D14

SB360

IC4
FAN1112D

DF10M
BR101

R205

5.6K

0.6W

R103
22R

0.6W

C14
220uF
16V

+

C9
100nF
63V

R202
1K

0.6W

IC1

FSDM0265RN

C103
10uF
50V

+

FS1
230V/3A

C102
10nF
1000V

R102
10k
2W

C15
47uF
25V

+

CONN1

B2P3-VH

D15

SB180

C110
275V

C2
100nF
63V

C12
2200uF
16V

+

C10
100nF
63V

R203

2.2K

0.6W

L4

56uH

C104
33uF
50V

C206
100nF
100V

IC5
FAN1616AS25

T3

C101
47uF
400V

+

IC2

H11A817A

R105

2.2k

0.6W

C5
100nF
63V

C16
2200uF
16V

+

IC3
KA431LZ

C300
250V

R204

1.2K

0.6W

D13

SB330

D102
UF4007

0V

0V

0V

0V

0V

0V

0V

0V

0V

0V

0V

0V

0V

0V

0V

12V/100mA

6.6V/0.7A

5V/1.2A
(incl 2.5V load)

2.5V

3.3V/1.2A
(incl 1.2V load)

1.2V

16W Multiple Output Isolated Flyback Converter Using FSDM0265RN

Typical Application – Set top boxes, decoders, and small DVD players

Industrial and communications applications using FPGAs and complex logic chips

FPS™Design Guide

The isolated, multiple output application shown is suited to applications requiring all of the common logic supply voltages: 5V, 3.3V,

2.5V and 1.2V. The flyback architecture is easily expandable: two additional outputs at 12V and 6.6V are shown in this application.

The design is scalable to higher power levels by changing the size of the FPS™ device and the transformer. The FSDM0265RN uses
current mode control which provides excellent response to line and load transient conditions. The flexible overload protection can
distinguish between a temporary current surge and a longer term overload condition. The over current latch is a current limit which
is active even during the blanking time. This pr

•

•

• Current limit may be lowered using an external resistor

Fairchild Devices Description

FSDM0265RN Fairchild Power Switch (1.5A/70kHz)
FAN1112D Voltage Regulator (1.2V/1A)

AN1616AS25

F
H11A817A Transistor Optocoupler
KA431 2.5V Reference (2.5V)
DF10M Bridge Rectifier

www

FSDM0265RN has a fully avalanche rated MOSFET with overcurrent latch
– Robust performance under transient conditions
– Device switches of
Overload pr
– Device does not shut down during load surge conditions
– Inherent short circuit protection

– Incr

.fair

eased flexibility in choice of range of FPS™ parts

childsemi.com/fps

f if there is a secondary diode short

otection cir

cuit distinguishes between temporar

oltage Regulator (2.5A/0.5A)

V

ovides additional system r

y and permanent overload

obustness against a secondary diode short circuit condition.

Fairchild Devices Description

SB180
SB330 Schottky Diode (3A/30V)
SB360 Schottky Diode (3A/60V)
UF4007
1N4148

21

Schottky Diode (1A/80V)

Fast Recover

y Diode (1A/1000V)

General Purpose Diode (10mA/100V)

FPS™Design Guide

123

45

678

1322

21

20

19

18

14

17

15

13

16

9

7

6

3

11

14

1

2

1

2

Drain1GND2Vcc3FB4Sync

5

1
2
3
4
5
6
7
8
9

1

23

4

R318
470K

0.25W

R306

10R

0.25W

L241
10uH

5A

FAN7527B

L201
10uH

5A

C230
470pF
1000V

C220
470pF
1000V

R106
600R

0.25W

C305

470nF

630V

C242
1000uF
50V

+

D201

EGP20D

R301
1M2

0.25W

R108

68K

0.5W

C309
1nF
25V

R308
470K

0.25W

C105

3.3nF
50V

C114
630V

R204
250K

0.25W

R204

D303
1N4148

C200

470pF
1000V

L231
10uH

5A

C231
100uF
200V

+

Q301

FQP13N50C

C212
1000uF
50V

+

R206
4K7

0.25W

T1

EF42 VOGT

C101
220uF
450V

+

C307
1uF MLCC
50V

C103
47uF

50V

+

VR201
30K

FS1
230V/3A

C201
1000uF
50V

+

L221
10uH

5A

BEAD101
FERRITE BEAD

BD100

-+

R118

68K

0.5W

R305
22K

0.6W

D241

FYPF0545

T301

VOGT EF25 PFC

D105

1N4937

D302

EGP30J

C241
1000uF
50V

+

VR301
10K

D211

EGP20D

R307

0.3R

0.6W

R110

S10K275

CONN3
B2P-VH

C104
47nF

50V

CONN1

B2P3-VH

D231

EGP20K

R105
470R

0.25W

C111
630V

C112
630V

C221
1000uF
50V

+

R201
1K

0.25W

IC1
KA5Q1265RFYDTU

F

C400

CONN2
B9P-VH

C210

470pF
1000V

C240
470pF
1000V

D103

1N4937

C202
1000uF
50V

+

L211
10uH

5A

C206

100nF

100V

D221

FYPF0545

R311
1M

0.25W

LF100

R309
6K

0.25W

D304
8V2

0.5W

D10
1N49376

C110
250V

R302

20K

0.25W

D108

1N4007

R103

10R

0.25W

C222
1000uF
50V

+

R202
1K

0.25W

C113
630V

IC3

KA431LZ

NTC100

2R

C232
100uF
200V

+

C211
1000uF
50V

+

C107
680pF
1600V

R203

39K

0.25W

IC2

H11A817A

High/Low

Examples of Typical Application Circuits

180W-200W KA5Q1265RF Quasi-resonant Flyback with Input Power Factor Correction Using FAN7527B/FQP13N50C

Typical Application – Color Televisions

22

www

.fair

childsemi.com/fps

FPS™Design Guide

Examples of Typical Application Circuits

180W-200W KA5Q1265RF Quasi-resonant Flyback with Input Power Factor Correction Using FAN7527B/FQP13N50C

Typical Application – Color Televisions

The circuit shown consists of a PFC stage built around the FAN7527B/FQP13N50C/EGP30J circuit and the quasi-resonant PWM
stage built around the KA5Q1265RF/T1 circuit. This circuit is suited for input voltages in the range from around 195V to 265V.

The transition mode PFC stage generates a DC bus voltage of around 400V. The purpose of the stage is to reduce the harmonic con­tent of the input current drawn from the AC supply as required by the EN61000-3-2 standard. An additional benefit is that the input
power factor is very high.

The KA5Q1265RF circuit generates the required output voltages using a multiple output flyback configuration. The device operates in
discontinuous mode and detects the point where the secondary current has dropped to zero. The device then switches on after a
delay set by the circuit around C105. As the delay is chosen to be at the first minimum of the primary side voltage ring as it
changes from Vin+ nVoto V
frequency is therefore asynchronous and varies with the load. This reduces the visible effect of switching noise on the television
screen. Fixed frequency switching noise would be seen as diagonal lines on the screen. The turns ratio is chosen to be unusually low
for a standard flyback because the output voltage on the main winding is exceptionally high. This keeps the reflected voltage nV

- nVothe device is switched on at a low voltage, which reduces the switching loss. The switching

in

low.

o

If the load on a quasi-resonant flyback circuit is reduced, the switching frequency increases which causes a reduction in efficiency.

The KA5Q series has a burst mode of operation. In normal operation the High/Low signal is High. When this signal which is typically
supplied by a microcontroller is Low, the current increases through the optocoupler, the feedback voltage goes to ground and the
device enters burst mode. In this case the output voltages drop until the voltage supplied to the chip through the auxiliary winding
drops to around 12V. The device remains in hysteretic burst mode until the feedback voltage increases. In this low power mode, the
PFC chip is deactivated via D304. In normal operation, the auxiliary winding voltage is around 24V, so there is sufficient voltage to
power up the PFC chip. In burst mode, the FPS™ voltage is between 11V and 12V, so the FAN7527B chip is deactivated, as its supply
voltage is around 8V lower than this.

• Complete PFC and PWM solution for a color television power supply
– High efficiency (typically 90% at full load)
– High power factor and low input current harmonics

• Quasi-resonant mode ideal for TV applications
– High efficiency due to lower voltage switching
– Asynchronous switching is not at constant frequency
– Slower dV/dt causes lower internal radiated interference

• Supports low power standby
– Hysteretic burst mode for KA5Q1265RF device

AN7527B PFC contr

– F

Fairchild Devices Description

KA5Q1265RF Fairchild Power Switch (8A/quasi resonant)

AN7527B Transition mode PFC controller

F
FQP13N50C High Voltage MOSFET (13A/500V)
EGP30J Fast Recovery Diode (3A/600V)
1N4937 Fast Recovery Diode (1A/600V)
GBU4M Bridge Rectifier (4A/1000V)
BZX85C8V2

oller deactivated at low power

Zener Diode (8.2V)

child Devices

Fair

Description

KA431 2.5V Reference (2.5V)
H11A817A Transistor Optocoupler
EGP20D

Fast Recover

y Diode (1A/200V)
EGP20K Fast Recovery Diode (1A/600V)
FYPF0545 Fast Recovery Diode (5A/45V)
1N4007 Fast Recovery Diode (1A/1000V)
1N4148 General Purpose Diode (10mA/100V)

www

.fair

childsemi.com/fps

23

FPS™Design Guide

5V

12V

85V-265VAC Input

Primary 36 turns
Vcc 8 turns
5V 3 turns
12V 7 turns

40W output

Lp = 520uH EER3016

Vfb

4

Vcc

3

GND

2

Drain

1

NC

5

Vstr

6

12

7

8

10

3

2

2

1

4

56

13

4 2

DB101

2KBP06

C103
100uF
400V

+

C205

47nF

50V

C201

1000uF

25V

+

R104

5R

L201

C102

220nF

275VAC

R101

560K/1W

D101
UF4007

LF101:23mH

C105
22uF
50V

+

D102

1N4148

ZD101

22V

C101

220nF

275VAC

C204

1000uF

10V

+

R201
1K

R105
40K
1W

R102
40K
1W

C104
100uF
400V

R206
56K
2W

R202

1.2K

IC301

H11A817A

R204

5.6K

R205

5.6K

IC101
FSDM07652R

C203

1000uF

10V

+

L202

RT101

IC201

KA431

C202
1000uF
25V

+

CONN1

B2P3-VH

T1:EER 3016

C301

4.7nF

YCAP

- +

F101
FUSE

C106
47nF
50V

D201

MBRF10100

D202

MBRF1045

R203

10K

Examples of Typical Application Circuits

40W Isolated Flyback Power Supply

Typical Application – AC Input Industrial Control, LCD Monitor

This shows a higher power isolated flyback application, sharing the same features as many of the lower power applications. A
lower inductance value is used to ensure that the associated leakage inductance is also kept low in this application, remembering
that snubber losses are proportional to the leakage inductance and to the square of the current.

obust and improves system reliability

FPS containing PWM IC with co-packaged MOSFET solution is ver

•

y r
– Fully avalanche rated switch
– Over current protection for secondary diode short circuit
– Over voltage protection

• Current mode control gives excellent line and load regulation
egulation

child Power Switch (2.5A/70kHz)

Fair

General Purpose Diode (1A/1000V)
General Purpose Diode (10mA/100V)

– Better r

• Overload protection distinguishes between temporary and permanent overload

Internal soft start reduces inrush current and output overshoot on turn on

•

Fairchild Devices Description

FSDM07652R
H11A817A Optocoupler
KA431 2.5V Reference (2.5V)
1N4007
1N4148
KBP06M Bridge Rectifier Diode (1.5A/600V)

24

www

.fair

childsemi.com/fps

Vfb

4

Vcc

3

GND

2

Drain

1

L&S

5

3

2

2

1

4

5

1

2

1

2

1

2

6

10

R104
5K1

0.25W

CONN1

B2P-VH

R101
200k

C203
10nF

50V

R2011KR202

1K

R204
15K

R205

3.9K

IC101
FS6X1220RT

C201
220uF
25V

C202
220uF
25V

+

R105

18R

R102
18R

D201

MBRF10100

D102

1N4148

IC201

KA431

CONN2

B2P-VH

C103
12nF
50V

+

R203

33k

R103
300K

0.5W

C105
47nF
50V

C104
47nF
50V

C102
1nF
50V

C101
47uF
100V

+

+

CONN3

B2P-VH

D101
UF4004

PC

H11A817A

36V - 72V

DC input

12V/2A output

Sleep Mode

On/Off Control

Primary 40 turns
Vcc 18 turns
12V 12 turns

Lp = 22uH EPC19

T1: EPC19

Examples of Typical Application Circuits

24W Single Output 48V DC/DC Flyback Converter

Typical Application – 48V DC Input Industrial Equipment, Central Office, Basestations, Routers

FPS™Design Guide

The Fairchild Power Switch family is also useful in DC input applications. Here the FS6X1220 has a 200V MOSFET with R

DS(on)

of
less than 0.3W. The topology is very similar to the AC input flyback topology. One important difference is the additional L&S pin­which serves two functions. First, if the voltage drops below 2.55V, the device stops switching. If the voltage drops below 1.8V, the
device goes into a shutdown mode which consumes only 300µA in the Vcc line.

• Flyback solution for this power level has good efficiency at a reasonable cost architecture can easily be expanded

to support multiple outputs

• Dual function shut down pin

– Undervoltage lockout below 2.55V
– 300µA shutdown below 1.8V

• Full protection features of FPS family integrated on chip

cuit, overvoltage, temporary overload are no problem fully avalanche rated part

t cir

– Shor

Fairchild Devices Description

FS6X1220RT Fairchild Power Switch (3.2A/300kHz)
UF4004 Fast Recovery Diode (1A/400V)
1N/FDLL4148
H11A817A Optocoupler (CTR = 80% – 160%)
KA431 Shunt Regulator

www

childsemi.com/fps

.fair

General Purpose Diode (10mA/100V)

25

FPS™Design Guide

1
2

Drain

1

GND

2

Vcc

3

Vfb

4

L&S

5

7

4

1

10

6

5

8

3

1
2

NC

1

C

2

E

3

NC4GND

5

COMP

6

FB

7

LED

8

R22 (NS)

390R

0.6W

C2
100nF
250V

R1

30K

Q10

FDS7088N7 or

FDZ5047N

D1
SB380

T1

C11
330uF
16V

+

R21
1K

C3
1nF
25V

U1

FS6X1220RT

R15
K6
1W

R17
K6
1W

R2
120K

R10
10K 1%

C7

4.7nF
25V

R8
330R

C13 (NS)

330pF

C12
47uF
100V

+

C9
330uF
16V

+

D2

MMBD914

C4
22uF
50V

+

D3

ES2B

R5

22R

0.6W

C6

4.7nF
25V

C8
330uF
16V

+

J1

Vout 3.3V/4A

R14
K6
1W

R9
3k 31%

C8
100nF
250V

U5
FOD2741A

C5
47nF
50V

30V-57V
DC Input

3.3V/4A
Output

Examples of Typical Application Circuits

Secondary Side Synchronous Rectification in a Power Over Ethernet Application

Typical Application – Power Over Ethernet, 48V DC Input Industrial Equipment

This solution is a interesting development of the 24W power supply concept. Here, synchronous rectification maximizes the
efficiency of the power supply by using a MOSFET instead of a diode. Instead of having a loss of around 0.5V to 1.0V
across a diode, the drop is now around 0.1V to 0.15V. This lead is to a 4% point increase in efficiency. An auxiliary winding
drives the MOSFET.

Also shown in Fairchild’s FOD2741A which combines the optocoupler and reference functionality into one chip. All relevant nodes
are accessible: LED drive, reference drive and the reference voltage itself.

Implementation of Power over Ether

•
– Cost effective solution

• High efficiency further improved by synchronous rectification
– Four percentage points more efficiency lowers overall system power load
FOD2741A combines optocoupler and r

•
– Lower component count and manufacturing costs

Fairchild Devices Description

FS6X1220R
FOD2741A
FDZ5047N BGA MOSFET (30V/2.9m
SB380
ES2B General Purpose Diode (2A/100V)

T Fairchild Power Switch (3.2A/300kHz)

MMBD914

Optocoupler + Refer

Schottky Diode (3A/80V)

General Purpose Diode (200mA/100V)

net with low component count

eference in one chip

ence

Ω)

26

www

.fair

childsemi.com/fps

Design Tools

FPS™Design Guide

AC to DC Designer

• Download from website at

www.fairchildsemi.com/designcenter/acdc

• Allows quick and easy fly-back design process.

• Provides a lookup into a database of available devices.

Gives a first-stab design for practical optimization.

•

• Can be used with controllers other than FPS.

Application Notes and Demo Boards

• To download Application Notes and articles,
visit:

www.fairchildsemi.com/fps

• Demoboards – available for a wide range of
applications. Contact your local sales representative.

www

.fair

childsemi.com/fps

27

FPS™Design Guide

Ordering Guide

childsemi.com/fps

.fair

www

28

Notes

FPS™Design Guide

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childsemi.com/fps

29

For a complete listing of sales representatives and sales offices,
visit www.fairchildsemi.com/cf/sales_contacts/

Americas

Fair

child Semiconductor
Customer Response Center
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Tel: [phone]
Fax: [phone]

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Di W

ang Commercial Centre
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e

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Fax: [phone]

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Hong Kong Ltd.
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The Gateway II
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Hong Kong
Tel: [phone]
Fax: [phone]

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Fairchild Semiconductor Srl
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Japan

Fairchild Semiconductor Japan Ltd.
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Tokyo, 102-0076 Japan
Tel: [phone]
Fax: [phone]

Fairchild Semiconductor Japan Ltd.
Osaka Office
Shin-Osaka Meiko Building 8F
4-3-12, Miyahara, Yodogawa-ku
Osaka, 532-0003 Japan
Tel: [phone]
Fax: [phone]

Korea

Fairchild Korea Semiconductor, Ltd.
Bucheon Of
82-3, Dodang-Dong,
Wonmi-Ku, Bucheon,
Gyounggi-do, 420-711

ea

Kor
Tel: [phone]
Fax: [phone]

Fairchild Korea Semiconductor, Ltd.

fice

Suwon Of
Saemaeul-hoi Building,
1122-12, Ingye-Dong,
Paldal-gu, Suwon-si,
Gyunggi-do, 442-070
Korea

el: 82-31-231-3100

T
Fax: [phone]

uck

fice

Fairchild Korea Semiconductor, Ltd.
Gumi Office
4F Saero-net Building
274-9, Songjeong-dong
Gumi-si, Gyungsang-buk-Do,
730-090, Korea
Tel: [phone]
Fax: [phone]

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#20-01/03 Shaw House
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Fax: [phone]

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SE-171 48 Solna
Sweden
Tel: [phone]
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Taiwan

Fairchild Semiconductor
Hong Kong Ltd. Taiwan Branch
18 F-A, No.167
Tun Hwa North Road
Taipei 10500, Taiwan
Tel: [phone]
Fax: [phone]

UK

child Semiconductor Ltd.

Fair

face House

Inter

face Business Park

Inter

ootton Bassett

W
Swindon SN4 8QE
United Kingdom
Tel: [phone]
Fax: [phone]

The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use
and is not intended to be an exhaustive list of all such trademarks: ACEx™,

™, ActiveAr

world.

EnSigna™, FACT™, FACT Quiet Series™, FAST®, FASTr™, FPS™, FRFET™, GlobalOptoisolator™, GTO™,
HiSeC™, I2C™,

oPak™, MICROWIRE™, MSX™, MSXPr

Micr
PACMAN™, POP™, Power247™, PowerSaver™, PowerTrench®, Programmable Active Droop™, QFET®,
QS™, QT Optoelectronics™, Quiet Series™, RapidConfigure™, µSerDes™, RapidConnect™, SILENT SWITCHER®,
SMART START™, SPM™, SuperFET™, Stealth™, SuperSOT™-3, SuperSOT™-6, SuperSOT™-8, SyncFET™, The
Power Franchise™, T

Lit. No. 600301-003

ray™, Bottomless™, CoolFET™,

i-Lo™, ImpliedDisconnect™, ISOPLANAR™, LittleFET™, MICROCOUPLER™, MicroFET™,

®

inyLogic

, TINYOPTO™

CROSSVOLT™, DOME™, EcoSP

o™, OCX™, OCXPr

ruTranslation™, UHC™, UltraFET

T

2004 Fair

©

Across the board. Around the

o™, OPTOLOGIC

®

, VCX™

child Semiconductor, All Rights Reserved

2

ARK™, E

®

CMOS™,

, OPTOPLANAR™,