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www.fairchildsemi.com
FSDM07652R
Green Mode Fairchild Power Switch (FPSTM)
Features
• Internal Avalanche Rugged Sense FET
• Advanced Burst-Mode operation consumes under 1 W at
240VAC & 0.5W load
• Precision Fixed Operating Frequency (66kHz)
• Internal Start-up Circuit
• Pulse by Pulse Current Limiting
• Abnormal Over Current Protection (AOCP)
• Over Voltage Protection (OVP)
• Over Load Protection (OLP)
• Internal Thermal Shutdown Function (TSD)
• Auto-Restart Mode
• Under Voltage Lock Out (UVLO) with hysteresis
• Low Operating Current (2.5mA)
Built-in Soft Start
OUTPUT POWER TABLE
230VAC ±15%(3)
85-265VAC
PRODUCT
Adapt- Open Adapt- Open
er(1) Frame(2) er(1) Frame(2)
FSDM0565R 60W
70W
50W
60W
FSDM07652R 70W
80W
60W
70W
Table 1. Notes: 1. Typical continuous power in a non-ven-
tilated enclosed adapter measured at 50°C ambient. 2.
Maximum practical continuous power in an open frame
design at 50°C ambient. 3. 230 VAC or 100/115 VAC with
doubler.
Application
• SMPS for LCD monitor and STB
• Adaptor
Description
The FSDM07652R 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, internal 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 simulta-
neously increasing efficiency, productivity, and system
reliability. This device is a basic platform well suited for cost
effective designs of flyback converters.
Typical Circuit
AC
IN
Vstr Drain
PWM
Vfb Vcc Source
Figure 1. Typical Flyback Application
DC
OUT
©2005 Fairchild Semiconductor Corporation
Rev.1.0.6

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FSDM07652R
Internal Block Diagram
N.C 5
0.5/0.7V
Vfb
4
Vcc
Idelay
+
-
Vref
IFB
Soft start
Vcc
3
8V/12V
Switching disable
2.5R
R
Vcc good
Vstr
6
Istart
Vref
OSC
PWM
SQ
RQ
LEB
VSD
Vcc
Vovp
TSD
Vcc good
SQ
RQ
AOCP
Drain
1
Internal
Bias
Gate
driver
Vocp
2 GND
Figure 2. Functional Block Diagram of FSDM07652R
2

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Pin Definitions
FSDM07652R
Pin Number
1
2
3
4
5
6
Pin Name
Drain
GND
Vcc
Vfb
N.C
Vstr
Pin Function Description
This pin is the high voltage power Sense FET drain. It is designed to drive the
transformer directly.
This pin is the control ground and the Sense FET source.
This pin is the positive supply voltage input. During start up, the power is sup-
plied by an internal high voltage current source that is connected to the Vstr pin.
When Vcc reaches 12V, the internal high voltage current source is disabled and
the power is supplied from the auxiliary transformer winding.
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 6.0V, the over load protection is activated resulting in shutdown of the
FPSTM.
-
This pin is connected directly to the high voltage DC link. At startup, the internal
high voltage current source supplies internal bias and charges the external ca-
pacitor that is connected to the Vcc pin. Once Vcc reaches 12V, the internal cur-
rent source is disabled.
Pin Configuration
TO-220F-6L
6.Vstr
5.N.C.
4.Vfb
3.Vcc
2.GND
1.Drain
Figure 3. Pin Configuration (Top View)
3