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UCC2813-2: The question of turn on threshold in UCC2813-2

Part Number: UCC2813-2

Hi Experts:

My customer is using the UCC2813-2 for the power design , the turn on threshold is 12.5V, however, the maximum rating of VCC is 12V , so I have two questions:

1)  The start up voltage should be above the 12.5V which will beyond the maximum rating ,is it risk to damage the device.

2)  If the device has started up , should be also need to supply the voltage (if supplied from the output) which will above the 12.5V?

  • Hi Jason

    The UCC2813-2 has an internal clamp that tracks the UVLO turn-on level.

    The UCC2813-2 needs to be powered through a series resistor which will limit the current into the Vcc pin and clamp circuit to less than 30mA.

    The note 3, section, 7.1, page 4 states.

    "In normal operation VCC is powered through a current limiting resistor. The resistor must be sized so that the VCC voltage under

    operating conditions is below 12 V but above the turnoff threshold. Absolute maximum of 12 V applies when VCC is driven from a low

    impedance source such that ICC does not exceed 30 mA."