Programming instructions

Power
Multisim Component Reference Guide 12-12 ni.com
12.1.8 FULL_VM
The FULL_VM is a generic model for Voltage Mode Full-Bridge PWM controllers. The full-
bridge converter is derived from the buck converter. By utilizing four operated switches, it is
able to deliver a larger amount of power.
Generic PWM controller parameters:
Pin No. Pin Name Description
1 OUT1 PWM signal Output 1 (Switch1 control signal)
8 GNF1 Voltage reference for OUT1
7 OUT2 PWM signal Output 2 (Switch2 control signal)
2 GND Ground (Voltage reference for OUT2 and
OUT4)
9 OUT3 PWM signal Output 3 (Switch3 control signal)
16 GNF3 Voltage reference for OUT3
15 OUT4 PWM signal Output 4 (Switch4 control signal)
3 COMP Error amplifier output
4 FB Output voltage feedback input
5 ISENSE Switch current sensing (for current limit)
Parameter Description
REF Internal reference voltage
PERIOD Switching period
DUTYMAX Maximum duty cycle
DUTYMIN MInimum duty cycle
RAMP Ramp amplitude for compensation
VOUTHI Driver output voltage high
VOUTLO Driver output voltage low
ROUT Driver output resistor
ComponentRef.book Page 12 Thursday, December 7, 2006 10:12 AM