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Dear Sir,
I wanted to understand the practical advantage of using Capacitor C42 (22nF) from output live to feedback optocoupler.
Also if I configure my output to 3.3V/30A , then in the feedback section TL431 with 2.5V reference or TLV431 with 1.24V reference which will give better regulation and good for a power supply.
A smaller reference or higher reference which will be better for the feedback section.
Thanks & Regards,
Nesh
Hi Nesh,
The capacitor increases the high frequency gain of the control loop by providing a low impedance path for high frequency signals around R12.
I would use the TLV341 with a 1.24V reference. The TL431 is a 2.5V reference and when used with a 3.3V output it leaves very little voltage to drive current through the forward Vf of opto-coupler diode.
Regards
Peter