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UCC28180: Vcc supply minimum value

Shyama Agrawal
Intellectual 860 points
Part Number: UCC28180

Hello,

The datasheet of UCC28180 says that Max Vcc Turn ON threshold is 12.1V. I was wondering if it would be okay to use a 12V supply with output tolerance +/- 100mV for it (Using a 12V fixed output LDO). 

The recommended VCC input voltage from a low-impedance source is recommended as VccOFF+1V leading to worst case scenario need of 11.3V which is not in sync with the above statement. Would you recommended going for a 12V supply with the above given specs for an automotive product?

  • 0
    TI__Mastermind 34465 points

    Hello 

    You will not be able to use a 12V supply with the UCC28180.
    The worst case high limit to VCC(ON) is 12.1V and that means you risk some of the parts not turning if your input has a lower limit 11.9V.

    The recommended operating conditions are misleading. You will need 11.9V minimum from your bias supply in order to start up the UCC28180 but once startup has occurred you can operate  at VCC(OFF) +1 . This value is 11.3V.

    I apologise for the confusion in the datasheet.

    Regards

    John