FS6X1220R_05 Datasheet, PDF (1/14 Pages) Fairchild Semiconductor – Fairchild Power Switch (FPS)

FS6X1220R
Fairchild Power Switch (FPS^TM)
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
V_LU
Line
Sense
5
V_SL
Vcc
I_delay
FB 4
V_SD
Vcc
Vovp
TSD
Line UVLO
Line UVLO
Vref
I_{FB 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
©2005 Fairchild Semiconductor Corporation
Rev.1.0.2