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| TC120_13 Datasheet, PDF (8/16 Pages) Microchip Technology – PWM/PFM Step-Down Combination Regulator/Controller | |||
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TC120
FIGURE 3-3:
SHUTDOWN CONTROL CIRCUITS
TC120XX03
SHDN
ON OFF
47K
SHDN/SS
2N2222
CSS
4.7nF
a) Using an Open Collector Device
SHDN
ON OFF
VIN CMOS
Gate
R1
TC120XX03
SHDN/SS
CSS
b) Using a Complementary Output Device
VIN
TC120XX03
RSS
SHDN/SS
CSS
c) Shutdown Not Used â with Pull-Up
FIGURE 3-4:
SOFT START TIMING
Shutdown
Signal
OFF
TC120XX03
SHDN/SS
CSS
4.7nF
d) Shutdown Not Used â No Pull-Up
ON
0.65V
SHDN/SS 0V
X
1.5msec
DS21365C-page 8
ï£ 2001-2012 Microchip Technology Inc.
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