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buck converter duty cycle control in hspice

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baltzois

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hi,
i have a buck converter and the switch is controlled by a pulse source. I have designed it in hspice . What i want to do is to control the pulse source with variable pulse width but hspice doesn;t give me that option. Can anybody tell me how to change pulse width in time ,and having the Vpp constant??
thank you
 

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You have to design the behavioural model of a PWM controller, e.g. from a ramp generator and a comparator.

Or use the simulation model of any real PWM controller of your choice.
 

baltzois

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well maybe i put it in a wrong way...i want to run one transient analysis where the duty cycle changes from 5 to 90% ...will the ramp generator help me??
thank you for your help!
 

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