Fairchild FSD176MRT service manual

FSD176MRT — Green-Mode Fairchild Power Switch (FPS™)

FSD176MRT
Green-Mode Fairchild Power Switch (FPS™)

Features

 Advanced Soft Burst-Mode Operation for

Low Standby Power and Low Audible Noise

 Random Frequency Fluctuation for Low EMI
 Pulse-by-Pulse Current Limit
 Various Protection Functions: Overload Protection

(OLP), Over-Voltage Protection (OVP), Abnormal
Over-Current Protection (AOCP), Internal Thermal
Shutdown (TSD) with Hysteresis, Output-Short
Protection (OSP), and Under-Voltage Lockout (UVLO)
with Hysteresis

 Low Operating Current (0.4mA) in Burst Mode
 Internal Startup Circuit
 Internal High-Voltage SenseFET: 650V
 Built-in Soft-Start: 15ms
 Auto-Restart Mode

Description

The FSD176MRT is an integrated Pulse Width
Modulation (PWM) controller and SenseFET specifically
designed for offline Switch-Mode Power Supplies
(SMPS) with minimal external components. The PWM
controller includes an integrated fixed-frequency
oscillator, Under-Voltage Lockout (UVLO), Leading­Edge Blanking (LEB), optimized gate driver, internal
soft-start, temperature-compensated precise current
sources for loop compensation, and self-protection
circuitry. Compared with a discrete MOSFET and PWM
controller solution, the FSD176MRT can reduce total
cost, component count, size, and weight; while
simultaneously increasing efficiency, productivity, and
system reliability. This device provides a basic platform
for cost-effective design of a flyback converter.

September 2011

Applications

 Power Supply for LCD Monitor, STB, and

DVD Combination

Ordering Information

(2)

(4)

Frame

Open

(5)

Output Power Table

Operating

Part Number Package

FSD176MRTUDTU

FSD176MRTLDTU

Notes:

1. Pb-free package per JEDEC J-STD-020B.

2. The junction temperature can limit the maximum output power.

3. 230V

4. Typical continuous power in a non-ventilated enclosed adapter measured at 50C ambient temperature.

5. Maximum practical continuous power in an open-frame design at 50C ambient temperature.

AC

TO-220

6-Lead

U-Forming

TO-220

6-Lead

L-Forming

or 100/115VAC with voltage doubler.

Junction

Temperature

-40°C ~

(1)

+125°C

-40°C ~

(1)

+125°C

Current

R

DS(ON)

Limit

3.50A 1.6 80W 90W 48W 70W FSGM0765R

3.50A 1.6 80W 90W 48W 70W FSGM0765R

(Max.)

230VAC ±15%

Adapter

(4)

(3)

85~265VAC

Open

Frame

(5)

Adapter

Replaces

Device

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD176MRT • Rev. 1.0.0

Application Circuit

AC

IN

FSD176MRT — Green-Mode Fairchild Power Switch (FPS™)

V

O

V

STR

Drain

GND

Internal Block Diagram

V

burst

0.30V / 0.45V

FB

N.C. 5

V

4

CC

2.0uA
I

DELAY

tON<t

OSP

V

ref

(1.0μs)

90uA

I

FB

FB

V

CC

Figure 1. Typical Application Circuit

V

STR

6 3

Soft Burst

Random

OSC

Soft Start

PWM

3R

R

SQ

R

LEB(300ns)

V

CC

I

CH

V

ref

VCCgood

Q

Gate

Driver

7.5V / 12V

Drain

1

V

SD

7.0V

V

CC

V

OVP

24.5V

LPF

V

OSP

TSD

VCCgood

SQ

R

Q

V

AOCP

GND

2

Figure 2. Internal Block Diagram

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD176MRT • Rev. 1.0.0 2

Pin Configuration

FSD176MRT — Green-Mode Fairchild Power Switch (FPS™)

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name Description

1 Drain

2 GND

3 VCC

4 FB

5 NC No Connection

6 V

SenseFET Drain. High-voltage power SenseFET drain connection.

Ground. This pin is the control ground and the SenseFET source.

Power Supply. This pin is the positive supply input, which provides the internal operating

current for both startup and steady-state operation.

Feedback. This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable operation, a capacitor
should be placed between this pin and GND. If the voltage of this pin reaches 7V, the overload
protection triggers, which shuts down the FPS.

Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link.
At startup, the internal high-voltage current source supplies internal bias and charges the

STR

external capacitor connected to the V
source (I

) is disabled.

CH

pin. Once VCC reaches 12V, the internal current

CC

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD176MRT • Rev. 1.0.0 3

FSD176MRT — 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 parts to these levels is not recommended.
In addition, extended exposure to stresses above the recommended operating conditions may affect device reliability.
The absolute maximum ratings are stress ratings only.

Symbol Parameter Min. Max. Unit

V

V

STR

V

Drain Pin Voltage 650 V

DS

V

V

CC

V

Feedback Pin Voltage

FB

I

Drain Current Pulsed 12.8 A

DM

I

Continuous Switching Drain Current

DS

EAS Single Pulsed Avalanche Energy

PD

T

J

T

Storage Temperature

STG

ESD

Notes:

6. Repetitive peak switching current when the inductive load is assumed: Limited by maximum duty (D
and junction temperature (see Figure 4. ).

7. L=45mH, starting TJ=25C.

8. Infinite cooling condition (refer to the SEMI G30-88).

9. Although this parameter guarantees IC operation, it does not guarantee all electrical characteristics.

Pin Voltage 650 V

STR

Pin Voltage 26 V

CC

12.0 V

Total Power Dissipation (TC=25C)

-0.3

T

=25C

(6)

C

TC=100C

(7)

390 mJ

(8)

6.4 A

4.0 A

50 W

Maximum Junction Temperature 150

Operating Junction Temperature

Electrostatic
Discharge Capability

Human Body Model, JESD22-A114 4.5

Charged Device Model, JESD22-C101 2.0

(9)

-40

-55

+125

+150

MAX

C

C

C

kV

=0.74)

Figure 4. Repetitive Peak Switching Current

Thermal Impedance

TA=25°C unless otherwise specified.

Symbol Parameter Value Unit

JA Junction-to-Ambient Thermal Impedance

JC Junction-to-Case Thermal Impedance

Notes:

10. Free standing without heat sink under natural convection condition, per JEDEC 51-2 and 1-10.

11. Infinite cooling condition per Mil Std. 883C method 1012.1.

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD176MRT • Rev. 1.0.0 4

(10)

63.5 °C/W

(11)

2.5 °C/W

FSD176MRT — Green-Mode Fairchild Power Switch (FPS™)

Electrical Characteristics

TJ = 25C unless otherwise specified.

Symbol Parameter Conditions Min. Typ. Max. Unit

SenseFET Section

BV

Drain-Source Breakdown Voltage

DSS

I

Zero-Gate-Voltage Drain Current

DSS

R

Drain-Source On-State Resistance VGS=10V, ID =1A 1.3 1.6 

DS(ON)

C

Input Capacitance

ISS

C

Output Capacitance

OSS

(12)

V

(12)

V

tr Rise Time V

tf Fall Time V

t

Turn-On Delay V

d(on)

t

Turn-Off Delay V

d(off)

= 0V, ID = 250A

V

CC

V

= 650V, TA = 25C

DS

= 25V, V

DS

= 25V, V

DS

= 325V, ID = 4A, RG=25 30 ns

DS

= 325V, ID = 4A, RG=25 26 ns

DS

= 325V, ID = 4A, RG=25 16 ns

DS

= 325V, ID= 4A, RG=25 39 ns

DS

= 0V, f=1MHz 674 pF

GS

= 0V, f=1MHz 93 pF

GS

Control Section

f

Switching Frequency

S

f

D

MAX

D

MIN

Switching Frequency Variation

S

Maximum Duty Ratio V

Minimum Duty Ratio V

(12)

V

(12)

= 14V, V

CC

-25C < T

= 14V, V

CC

= 14V, V

CC

= 4V 61 67 73 kHz

FB

< 125C

J

= 4V 61 67 73 %

FB

= 0V %

FB

IFB Feedback Source Current VFB=0V 65 90 115

V

START

V

STOP

t

S/S

UVLO Threshold Voltage

After Turn-on, V

Internal Soft-Start Time V

V

= 0V, V

FB

STR

CC

= 40V, V

Sweep 11 12 13 V

= 0V 7.0 7.5 8.0 V

FB

Sweep 15 ms

CC

Burst-Mode Section

V

BURH

V

V

BURL

HYS

Burst-Mode Voltage V

0.26 0.30 0.34 V

150 mV

= 14V, VFB Sweep

CC

Protection Section

I

Peak Drain Current Limit

LIM

V

Shutdown Feedback Voltage V

SD

I

Shutdown Delay Current V

DELAY

t

Leading-Edge Blanking Time

LEB

V

Over-Voltage Protection VCC Sweep 23.0 24.5 26.0 V

OVP

t

OSP

V

OSP

t

OSP_FB

TSD

T

HYS

Output-Short

Threshold VFB 1.8 2.0 2.2 V

Protection

V

Thermal Shutdown Temperature

Hysteresis 60

Threshold Time

(12)

FB

Blanking Time 2.0 2.5 3.0

(12)(14)

di/dt = 300mA/s

= 14V, V

CC

= 14V, V

CC

Sweep 6.45 7.00 7.55 V

FB

= 4V 1.2 2.0 2.8

FB

300 ns

OSP Triggered when
t
(Lasts Longer than t

Shutdown Temperature 130 140 150

(12)

ON<tOSP

& VFB>V

OSP

OSP_FB

650 V

250

±5 ±10 %

0.39 0.45 0.51 V

3.15 3.50 3.85 A

0.7 1.0 1.3

)

Continued on the following page…

A

A

A

s

s

C

C

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD176MRT • Rev. 1.0.0 5

FSD176MRT — Green-Mode Fairchild Power Switch (FPS™)

Electrical Characteristics (Continued)

TJ = 25C unless otherwise specified.

Symbol Parameter Conditions Min. Typ. Max. Unit

Total Device Section

I

OP

I

OPS

I

START

I

CH

V

STR

Operating Supply Current,
(Control Part in Burst Mode)

Operating Switching Current,
(Control Part and SenseFET Part)

Start Current

Startup Charging Current V

Minimum V

Supply Voltage VCC = V

STR

Notes:

12. Although these parameters are guaranteed, they are not 100% tested in production.

13. Average value.

14. t

includes gate turn-on time.

LEB

V

= 14V, V

CC

VCC = 14V, V

=11V (Before VCC

V

CC

Reaches V

= V

CC

= 0V, V

FB

= 0V, V

FB

FB

FB

START

= 0V 0.3 0.4 0.5 mA

= 2V 1.1 1.5 1.9 mA

)

= 40V 0.7 1.0 1.3 mA

STR

Sweep 26 V

STR

85 120 155

A

Comparison of FSGM0765R and FSD176MRT

Function FSGM0765R FSD176MRT Advantages of FSD176MRT

Random Frequency Fluctuation

Operating Current 1.6mA 0.4mA Very low standby power

Built-in

Low EMI

© 2011 Fairchild Semiconductor Corporation www.fairchildsemi.com
FSD176MRT • Rev. 1.0.0 6