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UCC25660: UCC256601 : LO, HO Pulse is not getting generated

Harshit Goel
Prodigy 10 points
Part Number: UCC25660

Tool/software:

Design Specs

Input voltage = 320V DC
Output Voltage= 48V DC, 5A

UCC25660DDBR IC is used and UCC25660X excel calculator has been used. Schematic has been attached.llc design.pdf

Operation
I have applied input voltage of 320V DC. After that i checked, at VCC(Pin 12) 12V is coming on the IC. 5v is generated at 5VP (Pin 8).

But LO (Pin11) and HO (Pin 15) are not generating pulses.

  • 0
    TI__Genius 15585 points

    Hi Harshit,

    You shouldnt apply negative voltage at the BW/OTP pin. Depopulate both R21 and R6 resistors. Also, you shouldnt use UCC256601 incase if you are connecting HV pin DC input as this controller activates x-cap discharge function. Please replace the controller with UCC256602.

    After you make these modification, measure BLK voltage. It needs to be higher than start threshold inorder to generate gate pulses.

    Regards

    Manikanta P

  • 0 in reply to Manikanta Pallantla
    Prodigy 10 points

    Hi Manikanta,
    Thanks for your suggestion.I will implement this in my circuit. Please help me to get the IC UCC256602 as it is in pre-production.Can you please provide me samples ?
    Thank You
    Regards
    Harshit

  • 0 in reply to Harshit Goel
    TI__Genius 15585 points

    Hi Harshit,

    You need to contact local FAE to get the samples. Let me know if you are not able to find one.

    Regards

    Manikanta P