Fairchild FSQ0170RNA, FSQ0270RNA, FSQ0170RNA, FSQ0270RNA Schematic

FSQ0170RNA, FSQ0270RNA

8-DIP

Green Mode Fairchild Power Switch (FPS™)

FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

October 2011

Features

 Internal Avalanche Rugged 700V SenseFET  Consumes only 0.8W at 230 V

Burst-Mode Operation

 Precision Fixed Operating Frequency, 100kHz  Internal Start-up Circuit and Built-in Soft-Start  Pulse-by-Pulse Current Limiting and Auto-Restart

Mode

 Over-Voltage Protection (OVP), Overload Protection

(OLP), Internal Thermal Shutdown Function (TSD)

 Under-Voltage Lockout (UVLO)  Low Operating Current (3mA)  Adjustable Peak Current Limit

& 0.5W Load with

AC

Applications

 Auxiliary Power Supply for PC and Server  SMPS for VCR, SVR, STB, DVD & DVCD Player,

Printer, Facsimile & Scanner

 Adapter for Camcorder

Related Application Notes

 AN-4134: Design Guidelines for Off-line Forward

Converters Using Fairchild Power Switch (FPS™)

 AN-4137: Design Guidelines for Off-line Flyback

Converters Using Fairchild Power Switch (FPS™)

 AN-4141: Troubleshooting and Design Tips for

Fairchild Power Switch (FPS™) Flyback Applications

 AN-4147: Design Guidelines for RCD Snubber of

Flyback

 AN-4148: Audible Noise Reduction Techniques for

FPS™ Applications

Description

The FSQ0170RNA, and FSQ0270RNA, consists of an integrated current mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V Sense FET. It is specifically designed for high-performance off-line Switch Mode Power Supplies (SMPS) with minimal external components. The integrated PWM controller features include: a fixed-frequency generating oscillator, Under-Voltage Lockout (UVLO) protection, Leading Edge Blanking (LEB), an optimized gate turn-on/turn-off driver, Thermal Shutdown (TSD) protection, and temperature compensated precision current sources for loop compensation and fault protection circuitry.

Compared to a discrete MOSFET and controller or RCC switching converter solution, the FSQ0170RNA, and FSQ0270RNA reduces total component count, design size, and weight while increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for the design of cost-effective flyback converters, as in PC auxiliary power supplies.

Ordering Information

Product Number Package Marking Code BV

FSQ0170RNA 8DIP Q0170RA 700V 100kHz 1 1 FSQ0270RNA 8DIP Q0270RA 700V 100kHz 7.2

FPSTM is a trademark of Fairchild Semiconductor Corporation.

DSS

f

OSC

R

DS(ON) (MAX.)

Application Diagram

Drain

GND

V

str

FB

V

CC

PWM

AC

IN

DC

OUT

I

PK

FSQ0x70RNA Rev. 1.01

8V/12V

V

ref

Internal

Bias

SQQ

R

OSC

V

CC

I

DELAY

I

FB

V

SD

TSD

V

ovp

Soft-Start

SQQ

R

2.5R

VCC good

V

CC

Drain

FB

GND

Gate

Driver

V

str

I

CH

V

BURL/VBURH

LEB

I

PK

Burst

Normal

PWM

V

CC

V

CC

VCC good

1

2 5

6,7,8

3

4

FSQ0x70RNA Rev. 1.00

FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

Figure 1. Typical Flyback Application

Output Power Table

Product

(1)

230V

Adapter

(3)

15%

AC

Open Frame

(2)

(4)

Adapter

85–265V

(3)

AC

Open Frame

(4)

FSQ0170RNA 14W 20W 9W 13W FSQ0270RNA 17W 24W 11W 16W

Notes:

1. The maximum output power can be limited by junction temperature.

2. 230 VAC or 100/115 VAC with doubler.

3. Typical continuous power in a non-ventilated enclosed adapter wi th sufficient drain pattern as a heat sink, at 50C ambient.

4. Maximum practical continuous power in an open-frame design with sufficient drain pattern as a heat sink, at 50 C ambient.

Internal Block Diagram

Figure 2. Internal Block Diagram

Pin Configuration

GND

V

CC

I

PK

V

str

8-DIP

FB

D

FSQ0x70RNA Rev. 1.00

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name Description

1GND

2V

CC

3FB

4I

5V

PK

str

6DrainSenseFET drain. High-voltage power SenseFET drain connection. 7DrainSenseFET drain. High-voltage power SenseFET drain connection. 8DrainSenseFET drain. High-voltage power SenseFET drain connection.

Ground. SenseFET source terminal on primary side and internal control ground.

Power Supply. Positive supply voltage input. Although connected to an a uxiliary transformer winding, current is supplied from pin 5 (V switch during start-up, see Figure 2. It is not until V threshold (12V) that the internal start-up switch opens and device power is supplied via the auxiliary transformer winding.

Feedback. The feedback voltage pin is the non-inverting input to the PWM comparator. It has a 0.9mA current source connected internally while a capacitor and opto-coupler are typically connected externally. A feedback voltage of 6V triggers overload protection (OLP). There is a time delay while charging external capacitor C

from 3V to 6V using an internal 5µA current source. This

FB

time delay prevents false triggering under transient conditions, but still allows the protection mechanism to operate under true overload conditions.

Peak Current Limit. This pin adjusts the peak current limit of the SenseFET. The 0.9mA feedback current source is diverted to the parallel combination of an internal 2.8k resistor and any external resistor to GND on this pin. This determines the peak current limit. If this pin is tied to V typical peak current limit is 0.8A (FSQ0170RNA), 0.9A (FSQ0270RNA).

Start-up. This pin connects to the rectified AC line voltage source. At start-up, the internal switch supplies internal bias and charges an external storage capacitor placed between the V

CC

the internal switch is opened.

) via an internal

str

reaches the UVLO upper

CC

or left floating, the

CC

pin and ground. Once the VCC reaches 12V,

FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

Absolute Maximum Ratings

Stresses exceeding the absolute maximum ratings may damage the device. The device may not function or be operable above the recommended operating conditions and stressing the part s to these levels is not recommended. In addition, extended exposure to stresses above the recommended operating conditions may affect device reli ability.

The absolute maximum ratings are stress ratings only

Symbol Characteristic Value Unit

V

DRAIN

Vstr Pin Voltage 700 V

V

STR

I

DM

E

AS

V

CC

V

FB

P

D

T

J

T

A

T

STG

Notes:

5. Non-repetitive rating: Pulse width is limited by maximum junction temperature.

6. L = 51mH, starting TJ = 25C.

Drain Pin Voltage 700 V

Drain Current Pulsed

(5)

Single Pulsed Avalanche Energy

(6)

FSQ0170RNA 4 FSQ0270RNA 8 FSQ0170RNA 50 FSQ0270RNA 140

mJ

Supply Voltage 20 V Feedback Voltage Range -0.3 to V

CC

Total Power Dissipation 1.5 W Operating Junction Temperature Internally limited C Operating Ambient Temperature -25 to +85 C Storage Temperature -55 to +150 C

A

V

FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

Thermal Impedance

TA = 25C, unless otherwise specified. All items are tested with the standards JESD 51-2 and 51-10 (DIP).

Symbol Parameter Value Unit



JA



JC



JT

Junction-to-Ambient Thermal Resistance Junction-to-Case Thermal Resistance Junction-to-Top Thermal Resistance

Notes:

7. Free standing with no heatsink; without copper clad.

(Measurement Condition - Just before junction temperature T

8. Measured on the DRAIN pin close to plastic interface.

9. Measured on the PKG top surface.

(7)

(8)

(9)

enters into OTP.)

J

80 C/W 20 C/W 35 C/W

Electrical Characteristics

TA = 25C unless otherwise specified.

Symbol Parameter Condition Min. Typ. Max. Unit

SenseFET Section

I

DSS

R

DS(ON)

C

ISS

C

OSS

C

RSS

Turn-On Delay Time

t

d(on)

t

Rise Time

r

Turn-Off Delay Time

t

d(off)

Fall Time

t

f

Control Section

Switching Frequency 92 100 108 KHz

f

OSC

f

OSC

Maximum Duty Cycle Measured at 0.1 x V

D

MAX

Minimum Duty Cycle 0 0 0 %

D

MIN

V

START

V

STOP

Feedback Source Current VFB = GND 0.7 0.9 1.1 mA

I

FB

Internal Soft-Start Time

t

S/S

(10)

Zero-Gate-Voltage Drain Current

Drain-Source On-State Resistance

(11)

Input Capacitance

Output Capacitance

Reverse Transfer Capacitance

FSQ0170RNA FSQ0270RNA 6.0 7.2 FSQ0170RNA

FSQ0270RNA 550 FSQ0170RNA 25 FSQ0270RNA 38 FSQ0170RNA 10 FSQ0270RNA 17 FSQ0170RNA FSQ0270RNA 20 FSQ0170RNA 4 FSQ0270RNA 15 FSQ0170RNA 30 FSQ0270RNA 55 FSQ0170RNA 10 FSQ0270RNA 25

Switching Frequency Variation

(10)

UVLO Threshold Voltage

(10)

V

= 700V, VGS = 0V 50

DS

= 560V, VGS = 0V,

V

DS

TC = 125C

= 10V, ID = 0.5A

V

GS

VGS = 0V, VDS = 25V, f = 1MHz

VDS = 350V, ID = 1.0A

-25C T

VFB = GND 11 12 13

= GND 7 8 9

FB

VFB = 4V 10 ms

200

8.8 11

250

12

85C±5 ±10 %

A

DS

55 60 65 %

FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

A



pF

ns

V

Electrical Characteristics (Continued)

= 25C unless otherwise specified.

T

A

Symbol Parameter Condition Min. Typ. Max. Unit

Burst-Mode Section

V

BURH

V

BURL

V

BUR(HYS)

Burst-Mode Voltage TJ 25C

Protection Section

I

LIM

t

CLD

T

SD

V

SD

V

OVP

I

DELAY

t

LEB

Peak Current Limit

Current Limit Delay Time

Thermal Shutdown Temperature

Shutdown Feedback Voltage 5.5 6.0 6.5 V

Over-Voltage Protection 18 19 V

Shutdown Delay Current VFB = 4V 3.5 5.0 6.5 A

Leading Edge Blanking Time

FSQ0170RNA di/dt = 170mA/µs 0.70 0.80 0.90 FSQ0270RNA di/dt = 200mA/µs 0.79 0.90 1.01

(10)

500 ns

(10)

125 140 C

(10)

200 ns

Total Device Section

IOP

I

V

CH

STR

Operating Supply Current (Control Part Only)

Startup Charging Current

V

Supply Voltage VCC = 0V 24 V

str

VCC = 14V 1 3 5 mA

= 0V,

V R

CC STR

<100k

(12)

Notes:

10. These parameters, although guaranteed, are not 100% tested in production.

11. Pulse test: Pulse width ≤ 300µs, duty ≤ 2%.

12. R

is connected between the rectified AC line voltage source and VSTR pin.

STR

0.5 0.6 0.7 V

0.3 0.4 0.5 V

100 200 300 mV

0.70 0.85 1.00 mA

FSQ0170RNA, FSQ0270RNA — Green Mode Fairchild Power Switch (FPS™)

A

Fairchild FSQ0170RNA, FSQ0270RNA, FSQ0170RNA, FSQ0270RNA Schematic [ru]

Specifications and Main Features

Frequently Asked Questions

User Manual