Fairchild FSGM300N service manual

FSGM300N

FSGM300N — Green-Mode Fairchild Power Switch (FPS™)

April 2012

Green-Mode Fairchild Power Switch (FPS™)

Features

 Advanced Burst-Mode Operation for Low

Standby Power

 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

 Auto-Restart Mode  Internal Startup Circuit  Internal High-Voltage SenseFET: 650V  Built-in Soft-Start: 15ms

Applications

 Power Supply for LCD Monitor, STB and DVD

Combination

Description

The FSGM300N 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 FSGM series can reduce total cost, component count, size, and weight; while simultaneously increasing efficiency, productivity, and system reliability. This device provides a basic platform suited for cost-effective design of a flyback converter.

Related Resources

 Fairchild Power Supply WebDesigner — Flyback

Design & Simulation - In Minutes at No Expense

Ordering Information

(2)

(4)

Open

Frame

Replaces

(5)

Device

Operating

Part Number Package

FSGM300N 8-DIP

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.

or 100/115VAC with voltage doubler.

AC

Junction

Temperature

-40°C ~ +125°C

Current

Limit

1.60A

R

DS(ON)

(Max.)

2.2Ω

Adapter

Output Power Table

230VAC ± 15%

(4)

26W 40W 20W 30W FSFM300N

(3)

85-265VAC

Open

Frame

(5)

Adapter

Application Circuit

FSGM300N — Green-Mode Fairchild Power Switch (FPS™)

Internal Block Diagram

V

burst

0.5V / 0.7V

FB

N.C. 4

V

3

V

OSP

V

SD

6V

V

CC

V

OVP

24V

V

CC

I

DELAY

tON<t

OSP

ref

(1.0μs)

I

FB

LPF

Figure 1. Typical Application Circuit

V

Random

OSC

Soft-Start

PWM

3R

R

TSD

VCCgood

LEB(400ns)

Figure 2. Internal Block Diagram

STR

5 2

I

CH

V

ref

VCCgood

SQ

Q

R

SQ

Q

R

Gate

Driver

V

CC

7.7V / 12V

V

AOCP

Drain

6, 7, 8

FSGM300N

1

GND

Pin Configuration

FSGM300N — Green-Mode Fairchild Power Switch (FPS™)

Figure 3. Pin Configuration (Top View)

Pin Definitions

Pin # Name Description

1 GND

2 VCC

3 FB

4 NC No Connection.

5 V

6, 7, 8 Drain

STR

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 6V, 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 external capacitor connected to the V source (I

SenseFET Drain. High-voltage power SenseFET drain connection.

) is disabled.

CH

pin. Once VCC reaches 12V, the internal current

CC

FSGM300N — 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

STR

V

DS

V

CC

V

FB

I

DM

I

Continuous Switching Drain Current

DS

EAS

PD

Pin Voltage

STR

Drain Pin Voltage

VCC Pin Voltage

Feedback Pin Voltage

Drain Current Pulsed

Single Pulsed Avalanche Energy

(7)

Total Power Dissipation (TC=25°C)

(6)

TC=25°C

TC=100°C

(8)

Maximum Junction Temperature

T

J

T

STG

ESD

Operating Junction Temperature

Storage Temperature

Electrostatic Discharge Capability

Human Body Model, JESD22-A114 2

Charged Device Model, JESD22-C101 2

(9)

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.

650 V

26 V

-0.3 8.0 V

4 A

1.90 A

1.27 A

190 mJ

1.5 W

150

-40

+125

-55 +150

°C

kV

=0.83)

MAX

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

JT Junction-to-Top Thermal Impedance

Notes:

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

11. Free standing with no heat-sink under natural convection.

12. Measured on the package top surface.

(10)

80 °C/W

(11)

20 °C/W

(12)

35

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 1.8 2.2 

DS(ON)

C

Input Capacitance

ISS

C

Output Capacitance

OSS

(13)

V

(13)

V

=0V, ID=250μA

CC

V

=520V, TA=125°C

DS

=25V, VGS=0V, f=1MHz 515 pF

DS

=25V, VGS=0V, f=1MHz 75 pF

DS

tr Rise Time VDS=325V, ID=4A, RG=25 26 ns

tf Fall Time VDS=325V, ID=4A, RG=25 25 ns

t

Turn-On Delay Time VDS=325V, ID=4A, RG=25 14 ns

d(on)

t

Turn-Off Delay Time VDS=325V, ID= 4A, RG=25 32 ns

d(off)

Control Section

f

Switching Frequency

S

Δf

D

MAX

D

MIN

Switching Frequency Variation

S

Maximum Duty Ratio V

Minimum Duty Ratio V

(13)

V

(13)

-25°C < T

=14V, VFB=4V 61 67 73 kHz

CC

=14V, VFB=4V 71 77 83 %

CC

=14V, VFB=0V 0 %

CC

< 125°C

J

IFB Feedback Source Current VFB=0 120 150 180

V

START

V

STOP

UVLO Threshold Voltage

After Turn-on, V

V

=0V, V

FB

Sweep 11 12 13 V

CC

=0V 7.0 7.7 8.5 V

FB

VOP VCC Operating Range 13 22.5 V

t

Internal Soft-Start Time V

S/S

Burst-Mode Section

V

BURH

V

BURL

Burst-Mode Voltage VCC=14V, VFB Sweep

0.4 0.5 0.6 V

STR

=40V, V

Sweep 15 ms

CC

Hys 200 mV

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 22.5 24.0 25.5 V

OVP

t

OSP

V

OSP

t

OSP_FB

T

SD

Output-Short

Threshold VFB 1.4 1.6 1.8 V

Protection

V

Thermal Shutdown Temperature

Threshold Time

(13)

FB

di/dt=300mA/μs

=14V, V

CC

=14V, VFB=4V 2.0 2.7 3.4

CC

(13)(15)

400 ns

OSP Triggered when t

ON<tOSP

Blanking Time 2.0 2.5 3.0

(Lasts Longer than t

Shutdown Temperature 125 135 145

(13)

Sweep 5.5 6.0 6.5 V

FB

& VFB>V

OSP

OSP_FB

Hys Hysteresis 40

650 V

250

±5 ±10 %

0.6 0.7 0.8 V

1.44 1.60 1.76 A

0.7 1.0 1.3

)

Continued on the following page…

μA

μs

°C

FSGM300N — Green-Mode Fairchild Power Switch (FPS™)

Fairchild FSGM300N service manual

Specifications and Main Features

Frequently Asked Questions

User Manual