Programming instructions

SMPS Transient Virtual
 National Instruments Corporation 12-9 Multisim Component Reference Guide
12.1.6 HALF_CM
The HALF_CM is a generic model for Current Mode Half-Bridge PWM controllers. The
half-bridge converter is an isolated version of the buck converter. Due to the dual-switch
configuration, it can handle larger power than other single-switch versions.
Generic PWM controller parameters:
Pin No. Pin Name Description
1 OUT1 PWM signal Output 1 (SWITCH1 control
signal)
8 GNF Voltage reference for OUT2
7 OUT2 PWM signal Output 2 (Switch2 control 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
DUTYMAX Maximum duty cycle
RAMP Ramp amplitude for compensation
VOUTHI Driver output voltage high
VOUTLO Driver output voltage low
ROUT Driver output resistor
ComponentRef.book Page 9 Thursday, December 7, 2006 10:12 AM