Continue to Site

Welcome to

Welcome to our site! is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Should current sense (CS) pin of LLC controller be filtered?

Not open for further replies.


Should the over-current sense input pin (“CS” pin) of the ICE2HSO1G LLC controller be a filtered and smoothed out current sense signal or an unfiltered image of the actual LLC primary current?


I expect this signal to have high frequency noise filtering even of it isn’t heavily smoothed, but how heavily filtered should this signal be? Obviously there’ll be a loss of response time if its too heavily smoothed.

Page 8 of the ICE2HSO1G datasheet discusses the “CS” pin.
The datasheet (pg 8) states that if the CS pin voltage is less than a certain level then the LLC controller will go into low power missing cycle mode to improve efficiency…..this suggests that the datasheet is recommending that the CS pin is heavily filtered, as if it were not, then the CS pin voltage would repeatedly go into missing cycle mode as the unfiltered signal went up and down.

The attached Ltspice simulation shows the LLC converter with both filtered, and then unfiltered current sense signal.


  • LLC.txt
    11.5 KB · Views: 27

Not open for further replies.

Part and Inventory Search

Welcome to