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UCC27531: Max continuous clamping current

jean Eidesheim
Prodigy 20 points
Part Number: UCC27531

Hi support team, could you please give me the following information :   the max continuous input (or clamping) current that the circuit withstands on each output when the circuit is supplied or not. Or confirm that the circuit withstands continuous input current up to 20 mA between each output and GND or VDD. The D.S. is not very precise concerning the clamping protection : 'In many cases, the external Schottky diode clamps may be eliminated because the presence of the MOSFET body diodes offers low impedance to switching overshoots and undershoots '. I just need to know if the clamping (or body) diodes are efficient on both GND and VDD supply voltage, on each output, up to 20 mA (or more). Thanks in advance for reply. Cdlt Jean

  • 0
    TI__Genius 13445 points
    Hi Jean,

    Thanks for reaching out to the High Power Drivers team, my name is Mamadou Diallo supporting low-side drivers.

    The driver's output stage structure can withstand 20mA of continuous reverse current as well as short duration pulses through the low impedance path provided by the internal MOSFETs' body diodes. 20mA (too low of current) should not cause logic malfunction nor failure from the device.

    Having said, it is always good practice to have external clamping diodes for additional protection to prevent transients surge beyond the driver's capability. External Zener (or others) clamp diodes (GND-OUT pin- VDD) AND placed very closed to the driver's output pins.

    This should not cause problems so long as the driver is operating within the recommended operating conditions and that you're not expecting transients beyond the rated abs max VDD+0.3V on the output stage.

    Please let us know if you have further questions or press the green button if this addressed your inquiry.

    Regards,

    -Mamadou
  • 0 in reply to Mamadou Diallo
    Prodigy 20 points
    Hi Mamadou,

    Thanks for your very fast response. It addresses my inquiry.
    Regards
    Jean