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FS6X1220R
Features

Fairchild Power Switch (FPSTM)
Description
The FS6X1220R is specially designed for an off-line DCDC converters with minimal external components. This device is a current mode PWM controller combined with a high voltage power SenseFET in a single package. The PWM controller includes integrated fixed frequency oscillator, line under voltage lockout, sleep on/off function, thermal shutdown protection, over voltage protection, pulse-by-pulse current limit and temperature compensated precise current sources for a loop compensation. Compared with discrete MOSFET and PWM controller solution, the FS6X1220R can reduce total cost, component count, size and weight simultaneously increasing efficiency, productivity, and system reliability. This device is well suited for DC to DC converter applications up to 40W of output power.
TO-220F-5L D2-PAK-5L

Current Mode PWM Control With a Fixed Operating Frequency (300kHz) Pulse by Pulse Current Limit Over Load Protection Over Voltage Protection Thermal Shutdown Built-in Auto-Restart Circuit Line Under Voltage Detection and Sleep on/off Function Internal High Voltage SenseFET (QFET) Supports Forward or Flyback Topology

Application
DC-DC Converter

1

1. Drain 2. GND 3. VCC 4. Feedback 5. Line Sense

Internal Block Diagram
Vcc 3 VLU
Line UVLO Vcc good 9V/15V

Drain 1

Line 5 Sense VSL
Vcc Idelay Vref IFB 28R OSC

Enable

Vref

Internal Bias

S

Q

FB 4
R VSD Vcc
S

R

Q

Gate driver

Q

Vovp TSD Line UVLO Vcc good
R Q

2 GND

Rev.1.0.2
2005 Fairchild Semiconductor Corporation

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FS6X1220RT DATASHEET