Download Sharp VL-DC1E Programming instructions

ComponentRef.book Page 6 Thursday, December 7, 2006 10:12 AM
Power
12.1.4 PUSH_CM
The PUSH_CM is a generic model for Current Mode Push-Pull PWM controllers. A pushpull converter is an isolated version of buck converter. Due to utilization of the transformer,
the output voltage of push-pull can be either higher or lower than the input voltage. Push-pull
converters are able to operate at a duty cycle close to 1.
Pin No.
Pin Name
Description
1
OUT1
PWM signal Output 1 (MOSFET1 switch
signal)
7
OUT2
PWM signal Output 2 (MOSFET2 switch
signal)
2
GND
Ground
3
COMP
Error amplifier output
4
FB
Output voltage feedback input
5
ISENSE
Switch current sensing (for current limit)
6
VOSC
Oscillator ramp signal output (provided for
ramp compensation purposes)
Generic PWM controller parameters:
Parameter
Description
REF
Internal reference voltage
PERIOD
Switching period
DEAD
Dead time between OUT1 and OUT2
RAMP
Ramp amplitude for compensation
VOUTHI
Driver output voltage high
VOUTLO
Driver output voltage low
ROUT
Driver output resistor
Multisim Component Reference Guide
12-6
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