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Infineon CCM PFC products: Frequently asked questions – KBA236234

Infineon CCM PFC products: Frequently asked questions – KBA236234

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  1. Is the ISENSE pin current limited by both RCS + opamp input resistance in ICE3PCS01G PFC IC? If yes, what is the value of the opamp internal input resistance highlighted in the attached figure? Explain with an example of 40A allowable start-up inrush current what will be the ISENSE current.

    Infineon_Team_0-1663939007039.png

     


  2. Yes. In the ICE3PCS01G PFC IC, the ISENSE pin current is limited by both RCS + opamp input resistance. The value of opamp internal input resistance is 7kΩ. This resistor inside the IC that is connected in series with the ISENSE pin is large enough to limit the ISENSE current so that the inrush current during startup will be within the -1 mA – 1 mA range.

See the following example to allow maximum 40A inrush current during start-up.

The selected Rshunt value is 3 mΩ.

The voltage across the Rshunt is Vshunt = IINRUSH × Rshunt = 0.12 V

The current at the ISENSE pin = Vshunt/RCS + opamp = 17 µA, which is within the limit as specified in the datasheet.

  1. What are the possible solutions to reduce higher noise in power factor correction (PFC) choke?

Use a capacitor not more than 10nF at the ISENSE pin.

Improve the PCB layout such that the ICOMP capacitor GND does not share any path with another signal, but has a direct path to the IC GND pin.

Infineon resources:

Resources

Link

Infineon PFC controllers portfolio

Product brief

Product datasheet, reference designs, and application notes

CCM PFC IC product webpage

Design guide

Design Guide for Boost Type CCM PFC with ICE3PCSxx

Design tools such as estimator

Contact Technical Assistance Center

Developer community

Infineon technical support

 

Additional references:

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