Programming instructions

Power
Multisim Component Reference Guide 12-6 ni.com
12.1.4 PUSH_CM
The PUSH_CM is a generic model for Current Mode Push-Pull PWM controllers. A push-
pull 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.
Generic PWM controller parameters:
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)
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
ComponentRef.book Page 6 Thursday, December 7, 2006 10:12 AM