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UCC5880-Q1: how much value blanking capacitor is used across the DESAT pin and ground

Kayala Naga Venkata Sandeep
Prodigy 50 points
Part Number: UCC5880-Q1
Other Parts Discussed in Thread: UCC5881-Q1

Tool/software:

Hello  TI

We planning use UCC5880-Q1,or UCC5881-Q1 gate driver  for the DESAT functionality how much value of blanking capacitor is used across the DESAT pin and GND2.and how much value of diode and resistor used in series with DESAT pin if we want use microchip SIC MOSFET  3300V, 25 mΩ N-Channel mSiCTm MOSFET MSC025SMA330B4N.

Thanks & Regards

K.N.V.SANDEEP

  • 0
    TI__Expert 7473 points

    Hi Sandeep,

    Thanks for reaching out. The blanking capacitor, CBLK, is used to slow down the charge time of the DESAT pin node during switching transitions to prevent false detections. RDESAT and DCLMP are used to protect the DESAT pin from large peak currents through the DDESAT junction capacitance during switching transitions. Note that the DCLMP diode remains on the left side of the RDESAT resistor to prevent large reverse current when the power device is in 3Q conduction mode. The DDESAT diode is chosen for fast reverse recovery to reduce losses due to high dv/dt on VDS. Sometimes, two DDESAT diodes are placed in series to help spread out the thermal energy, and prevent single point failures in the event of a latent defect causing one diode to fail. Values for these external components depend heavily on the power FET parameters and are often determined experimentally to achieve robust noise immunity and fast short-circuit intervention time. Typical value ranges for each component are listed below.
    • CBLK: 33pF to 330pF
    • RDESAT: 500Ω to 2kΩ
    • DCLMP: 30V to 40V fast response Schottky diode
    • DDESAT: 3300V+safety margin (overshoot) fast reverse recovery diode

    Best,

    Pratik Adibatla.