I am modelling ICE2PCS05 in PowerESim. I have trouble with frequency setup. The frequency is always about 65 kHz whatever I enter during initialization (I need 220 kHz). Because of this all components values computed for much smaller frequency than I need. All other values entered during initialization was accepted correctly. So what should I do to initialize circuit with 220 kHz?
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According initialization page's comment, user need change the frequency setting resistor to adjust the operating frequency.
Resistor value attached to FRB2 pin should be modified. Refer pictures
Thank You Guruprasad_A.
Changing resistor value had effect on PWM frequency. But I see that inductor value and compensation network didn't not changed with frequency.
I don't care about inductor value because I can calculate it by myself. But I can't calculate compensation network according to Design Guide for Boost Type CCM PFC with
ICE2PCSxx because it is sophisticated. For instance: there are calculations relied on PWM frequency, but in PowerEsim Ccomp is still same for any frequency.
So what should I do to force PowerEsim to recalculate inductor and compensation net values after frequency is changed?
Hi @Serj ,
I apologise for the delayed reply.
For this IC, we don't have any other design tools.
Refer to the "Design Guide for Boost Type CCM PFC with
ICE2PCSxx " to calculate the compensation value. And verify in S - Z loop tool in PowerSim.
I understand that there are no another design tools. My question was: is it correct that after changing PWM frequency using resistor at Rfb pin, choke and compensation network values stay intact?
Hi @Serj ,
Choke and compensation network values are calculated during initialization stage. It is necessary to manually modify the compensation network parameter after adjusting the PWM frequency with a resistor.
Please check my steps:
1. I press "New Design" button .
2. Press "Detail Spec" button.
3. In "Switching frequency" cell enter 220 kHz and press "Done"
4. Immediately after this, I see that frequency in popup windows are not same as I entered.
5. I change Rfreq value and I see that frequency has been changed but choke and compensation values hadn't.
So I conclude that PWM frequency have no effect on components values during initialization; and Rfreq have no effect on components after changing its value.
Are my steps correct?