Programming instructions

SMPS Transient Virtual
 National Instruments Corporation 12-7 Multisim Component Reference Guide
Internal error amplifier parameters:
 To view or change a component’s model parameters:
1. Double-click on the placed component and select the Valu e tab.
2. Click Edit Model to display the Edit Model dialog box.
3. View or edit the model parameters as desired. For more information on the Edit Model
dialog box, refer to the Multisim User Guide, or the Multisim helpfile.
12.1.5 HALF_VM
The HALF_VM is a generic model for Voltage Mode Half-Bridge PWM controllers. The
half-bridge converter is an isolated version of the buck converter. Due to the dual-switch
configuration, it is able to handle larger power than other single-switch versions.
Parameter Description
VHIGH Maximum output voltage
VLOW Minimum output voltage
ISINK Current sink capability
ISOURCE Current source capability
POLE First pole in Hertz
GAIN DC open-loop gain (default = 90 dB)
Pin No. Pin Name Description
1 OUT1 PWM signal Output 1 (MOSFET1 switch
signal)
8 GNF Voltage reference for OUT2
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)
ComponentRef.book Page 7 Thursday, December 7, 2006 10:12 AM