PowerPSoC as boost psu

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PowerPSoC as boost psu

Postby Terrence » Thu Jun 03, 2010 7:59 am

Hi All,

I'm thinking of using a PowerPSoC as a boost supply, say 25V 100mA, from an input of 3V, or similar.
I have a few questions.

1. Does anyone have an example or apppnote. I can't seem to find one on the Cypress site.
2. Does any software tool exist, that one may use to simulate the power psoc as a boost convertor, other than what is available as the boost configuration wizard in PD?
3. As the PP is normally used for HB LED driving, which is normally associated with a fair amount of acceptable ripple, would the PP be able to produce a worthwhile PSU?

Thank you for any responses.
Terrence
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Re: PowerPSoC as boost psu

Postby yzr » Sun Jun 06, 2010 4:55 pm

Terrence,
The PowerPSoC chip needs a minimum of 5V for operation.
If the CSA is used for current sensing, a minimum of 7V is needed on the CSA.

If your Boost is a Constant Current type, then you can take two approaches.
a) Regulate the input current using the channel CSA. Use a second sense resistor to monitor output current and regulate the input current using a software loop.
b) Regulate the output current using the channel CSA. In this mode, you will need to use the Modulator to generate the Boost drive signal.

If your Boost is a Constant Voltage type, then you can use an external voltage divider and bring the feedback loop into the PPSoC via a FN pin.

The App Note http://www.cypress.com/?docID=21163 shows how a buck-boost is setup. The same approach can be used for a Boost also.

Eitherways, the PPSOC needs a min of 4.75V to operate.

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Re: PowerPSoC as boost psu

Postby Terrence » Mon Jun 07, 2010 12:22 am

Thanks yzr.

While waiting for a reply, I have realised that my requirment could be met by any PSoC (other than the VCC restriction on PP), as it is a simple constant Voltage supply.
I guess I could easily maintain a software control loop.

regards.
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