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UCC28070 Curreent sensing

Maurizio6434
Intellectual 295 points
Other Parts Discussed in Thread: UCC28070, THS4281

Is there any idea about to use UCC28070 with shunt resistors instead of transormers to sense the mosfet current?

Did anybody make such an attempt?

  • 0
    Prodigy 125 points

    Hi, Maurizio

    do you have any reference circuit with ucc28070 except that 300W from TI?

    currently im using this ic for 1kw power supply. can u help me?

    zdluo@asmpt.com

    thanks

  • 0
    Intellectual 410 points

    Hi  Maurizio,

    Yes. UCC28070 has current synthesize which  allow you to use resistor for current sensing. For amplifying I am using THS4281 in instrumental configuration and blanking puls .

    Duration of blanking puls depend on switching  frequency and  Qg chosen mosfet.  200-350ns blanking puls on raising and falling edge can keep you waveform clean from noises during transition time. Keep gain (THS4281) low and band-with high. There  is another elegant solution for current sensing. SI8503 from Silicon Labs. I tested this sensor and it works excellent  on 200kHz.    SI85XX works synchronously with   UCC28070 PWM output and need to be connected  with 22Ohm (max) resistor to pin# 3 of SI8503 to out of mosfet  gate driver.

    I hope i gave you idea to solve problem with current sensing.

    Dragan