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UCC28740: Please tell me about transient responsiveness of UCC28740.

Part Number: UCC28740

My customers are considering UCC 28740 with the following specifications.

◎Customer's specifications are here.◎

Input Voltage: 154 V to 480 V @ AC

Output Voltage: about 12V

Output Power: 12.5 W @ MAX

Fsw: 100 kHz to 120 kHz

Control Mode: Voltage or Current

Operating temperature: -40 to 70 ° C

◎Load variation is here.◎

Period: 1 sec

Steady load: 0.3 A @ 990 msec

Heavy load: 1.0 A @ 10 msec

<Question>

What is the transient variation of the 12V output under this load condition?

Please help me!

Best regards,

Pokkun (Masumi Sekiguchi)

  • Pokkun,

    Thanks for the interest here.

    Transient response is mostly dependent on output capacitance and loop response. For loop it usually uses opto-coupler so can be limited by that.

    What specification do you need to meet?

    Regards

    John