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.
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.
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
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
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
°C
°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.