The threshold of IOUT OVER/UNDER VOLTAGE INDICAITON for LM3492HC

Atsushi Yamauchi

I would like to confirm the threshold for IOUT OVER/UNDER VOLTAGE INDICAITON.

For 0ver Voltage, the specification is VIOUT-OV. Is it correct?

And for Under Voltage, the conditons are minimum required voltage can regurate ILED and maximum CDHC pin voltage. In this case, how much is maximum CDHC pin voltage? And does the minimum required voltage depend on LEDs? Or is it decided by this IC?

I don't understood the threshold for IOUT UNDER VOLTAGE INDICAITON very well .

Couuld you please teach them?

Best regards,

Atsushi Yamamauchi

over 7 years ago

0 Clinton Jensen over 7 years ago

TI__Mastermind 25500 points

IOUT overvoltage indication occurs when VIOUT reaches or exceeds 6.5V. This could happen if LEDs in a string short so that IOUT has to absorb the extra voltage. IOUT undervoltage indication occurs when VIOUT is too low to keep the LED string in regulation. This could happen if an LED string opens or if the LED string voltage is just too high to reach regulation.

0 Atsushi Yamauchi over 7 years ago in reply to Clinton Jensen

Genius 4810 points

Dear Clinton-san,

Thank you for your response.
For IOUT undervoltage indication, does the threshold voltage depond on LED characteristics?
Can not the IC decide the threshold voltage, can it?

Best regards,
Atsushi Yamauchi

0 Clinton Jensen over 7 years ago in reply to Atsushi Yamauchi

TI__Mastermind 25500 points

It depends on the LED current. See the Electrical Characteristics table for the specs "VIOUTxx-MIN" with the "xx" being the different current levels.

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The threshold of IOUT OVER/UNDER VOLTAGE INDICAITON for LM3492HC