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Fairchild Semiconductor - Fairchild Power Switch (FPS)

Numéro de référence FS6X1220
Description Fairchild Power Switch (FPS)
Fabricant Fairchild Semiconductor 
Logo Fairchild Semiconductor 





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FS6X1220 fiche technique
FS6X1220R
Fairchild Power Switch (FPSTM)
www.fairchildsemi.com
Features
• 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
Description
The FS6X1220R is specially designed for an off-line DC-
DC 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 simulta-
neously 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
Internal Block Diagram
1
1. Drain 2. GND 3. VCC 4. Feedback 5. Line Sense
VLU
Line
Sense
5
VSL
Vcc
Idelay
FB 4
VSD
Vcc
Vovp
TSD
Line UVLO
Line UVLO
Vref
IFB 28R
R
OSC
Vcc good
Enable Vref
SQ
RQ
Vcc good
SQ
RQ
Vcc
3
9V/15V
Internal
Bias
Drain
1
Gate driver
2 GND
©2004 Fairchild Semiconductor Corporation
Rev.1.0.1

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