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UCC25630-1EVM-291: UCC25630-1EVM-291

Alex Abramovitz
Prodigy 30 points
Part Number: UCC25630-1EVM-291
Other Parts Discussed in Thread: UCC256303, UCC256301, UCC25600

Dear support,

to avoid dealing with high voltage I've tried operating the UCC25630-1EVM-291 as dc to dc converter

providing it with separate  Vcc =15 V  through TP21, and 3.5 v to TP6 as an artificial BLK signal.

Also, as suggested in the datasheet, I've grounded HV pin (TP12 shorted to TP13).

Still the controller won't wake up. (RVCC=0, no switching, no power consumption from Vcc source.)

Please advice.

  • 0
    TI__Mastermind 27135 points
    Hi Alex,

    You would need to swap out the controller to UCC256303 if you plan to ground the HV pin. The device will not wake up because UCC256301 waits for VCC to charge up to 26V before enabling RVCC.

    I should also mention that this EVM is designed to run off 390V input. If you change the input voltage, then the converter will likely have issues maintaining regulation.

    What are you trying to power? If you can share your design spec, I can suggest something that might be more suitable for your design.

    Best Regards,
    Ben Lough
  • 0 in reply to Benjamin Lough
    Prodigy 30 points
    Thanks Ben!
    Eventually I intend to operate the board from 250-400 vdc input.
    My objective is attaining high voltage/ high frequency AC from across the T1 transformer's primary (pins 1-3) as my output.
    I hope to regulate the frequency and magnitude of the output voltage manually by injecting a dc voltage through J4
    (while disabling the output rectifiers and the feedback path)
    I also would like to switch the AC output on/off by an external clock.

    Before modifying the board I'd like to see it switching.
    So with , say 50vdc at the input for safety reasons, what signals should I provide/where in order to just awaken it.

    Thanks,
    Alex
  • 0 in reply to Alex Abramovitz
    TI__Mastermind 27135 points
    Hi Alex,

    I think UCC25600 is going to be easier to implement what you are looking to do. UCC25630x uses the resonant capacitor voltage to decide when to terminate the HO/LO gate pulses and if the resonant capacitor voltage has some distortion on it, then it will affect the switching behavior.

    www.ti.com/.../ucc25600evm

    Best Regards,
    Ben Lough