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Fairchild Semiconductor
Fairchild Semiconductor

7M0880 Datasheet

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FS7M0680, FS7M0880
Fairchild Power Switch (FPSTM)
www.fairchildsemi.com
Features
• Pulse by Pulse Current Limit
• Over load protection (OLP) - Latch
• Over voltage protection (OVP) - Latch
• Internal Thermal Shutdown (TSD) - Latch
• Under Voltage Lock Out (UVLO) with hysteresis
• Internal High Voltage SenseFET (800V rated)
• User defined Soft Start
• Precision Fixed Operating Frequency (66kHz)
Application
• PC power supply
• PDP
Table 1. Maximum Output Power
OUTPUT POWER TABLE
PRODUCT
230VAC ±15%(2)
Open Frame(1)
85-265VAC
Open Frame(1)
FS7M0680
80W (Flyback)
150W (Forward)
180W (Forward) (3)
65W (Flyback)
FS7M0880
110W (Flyback)
200W (Forward)
250W (Forward) (3)
85W (Flyback)
Notes: 1. Maximum practical continuous power in an open
frame design at 50°C ambient. 2. 230 VAC or 100/115
VAC with doubler. 3. When the cooling fan is used.
Description
The Fairchild Power Switch FS7M-series is an integrated
Pulse Width Modulator (PWM) and Sense FET specifically
designed for high performance offline Switch Mode Power
Supplies (SMPS) with minimal external components. This
device is an integrated high voltage power switching
regulator which combine an avalanche rugged Sense FET
with a current mode PWM control block. The PWM controller
includes integrated fixed frequency oscillator, under voltage
lockout, leading edge blanking (LEB), optimized gate driver,
soft start, temperature compensated precise current sources
for a loop compensation and self protection circuitry.
Compared with discrete MOSFET and PWM controller
solution, it can reduce total cost, component count, size and
weight simultaneously increasing efficiency, productivity, and
system reliability. This device is a basic platform well suited
for cost effective designs of flyback and forward converters.
Typical Circuit
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AC IN
FS7M-series
S/S
PWM
VFB Vcc
Drain
GND
Vo
Figure 1. Typical Forward Application
©2005 Fairchild Semiconductor Corporation
Rev.1.0.2
datasheet pdf - http://www.DataSheet4U.net/
Page 1

FS7M0680, FS7M0880
Internal Block Diagram
Vcc
3
Soft start 5
Vref
9V/15V
Reset
Vcc good
Vref
OSC
FB 4
Vcc
Idelay
Vref
IFB
2.5R
R
VSD
Vcc
Vovp
TSD
PWM
SQ
RQ
LEB
Vcc Reset
(Vcc<6V)
SQ
RQ
AOCP
Drain
1
Internal
Bias
Gate
driver
Vocp
2 GND
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Figure 2. Functional Block Diagram of FS7M0680 and FS7M0880
2
datasheet pdf - http://www.DataSheet4U.net/
Page 2

Pin Definitions
FS7M0680, FS7M0880
Pin Number
1
2
3
4
5
Pin Name
Drain
GND
Vcc
Vfb
Soft-start
Pin Function Description
High voltage power SenseFET drain connection.
This pin is the control ground and the SenseFET source.
This pin is the positive supply input. This pin provides internal operating
current for both start-up and steady-state operation.
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 7.5V, the over load protection triggers resulting in
shutdown of the FPS.
This pin is for the soft start. Soft start time is programmed by a capacitor on
this pin.
Pin Configuration
TO-3P-5L
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5.S/S
4.Vfb
3.Vcc
2.GND
1.Drain
Figure 3. Pin Configuration (Top View)
3
datasheet pdf - http://www.DataSheet4U.net/
Page 3

FS7M0680, FS7M0880
Absolute Maximum Ratings
FS7M0680
Parameter
Maximum Drain Voltage (1)
Drain-Gate Voltage (RGS=1M)
Gate-Source (GND) Voltage
Drain Current Pulsed (2)
Single Pulsed Avalanche Energy (3)
Avalanche Current (4)
Continuous Drain Current (TC=25°C)
Continuous Drain Current (TC=100°C)
Maximum Supply Voltage
Input Voltage Range
Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
Symbol
VD,MAX
VDGR
VGS
IDM
EAS
IAS
ID
ID
VCC,MAX
VFB
PD
Derating
TA
TSTG
Value
800
800
±30
24.0
455
20
6.0
3.8
30
-0.3 to VSD
150
1.21
-25 to +85
-55 to +150
FS7M0880
Parameter
Maximum Drain Voltage (1)
Drain-Gate Voltage (RGS=1M)
Gate-Source (GND) Voltage
Drain Current Pulsed (2)
Single Pulsed Avalanche Energy (3)
Avalanche Current (4)
Continuous Drain Current (TC=25°C)
Continuous Drain Current (TC=100°C)
Maximum Supply Voltage
Input Voltage Range
Total Power Dissipation
Operating Ambient Temperature
Storage Temperature
Symbol
VD,MAX
VDGR
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VGS
IDM
EAS
IAS
ID
ID
VCC,MAX
VFB
PD
Derating
TA
TSTG
Note:
1. Tj = 25°C to 150°C
2. Repetitive rating: Pulse width limited by maximum junction temperature
3. L = 24mH, VDD = 50V, RG = 25, starting Tj =25°C
4. L = 13µH, starting Tj = 25°C
Value
800
800
±30
32.0
810
15
8.0
5.6
30
-0.3 to VSD
190
1.54
-25 to +85
-55 to +150
Unit
V
V
V
ADC
mJ
A
ADC
ADC
V
V
W
W/°C
°C
°C
Unit
V
V
V
ADC
mJ
A
ADC
ADC
V
V
W
W/°C
°C
°C
4
datasheet pdf - http://www.DataSheet4U.net/
Page 4
Part Number 7M0880
Manufactur Fairchild Semiconductor
Description Search -----> FS7M0880
Total Page 18 Pages
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7M0880 datasheet
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