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UCC27282-Q1: bootstrap diode

kura
Genius 4680 points
Part Number: UCC27282-Q1

Please let us know how much current rating of integrated bootstrap diode is ?

  • 0
    TI__Expert 5845 points

    Hey Kura,

    Thank you for your question regarding the UCC27282-Q1.

    For the bootstrap diode current maximums, the diode average current should be kept below 80mA. This average value can be found by using the switching frequency (Fsw) and the total charge Qg of the high side FET that is connected to the HO pin (I = Qg * Fsw). This device does not have an internal series resistance with the bootstrap diode but the diode's dynamic impedance (approximately 1.5 Ohms) helps to limit the peak forward current and prevents damage in most applications. This peak forward current would most often be experienced during startup. In high switching frequency (Fsw>1MHz) applications where a small low-side minimum pulse width is used, the peak diode forward and reverse current would be very high and so we would recommend an external Schottky bootstrap diode.

    Let me know if you have any further questions.

    Thank you,

    William Moore