TLV431: function of TLV431

Fred Cheng

Expert 5320 points

Part Number: TLV431

Hi team,

May I know what function does this TLV431 behave like? comparator or regulator?

if it's the regulator function , then what is the regulation voltage ?

Regards,

Fred

over 2 years ago

0 Walter Zollinger over 2 years ago

TI__Expert 7820 points

Hello Fred,

I believe from looking at the schematic, PRC229 is a 0 ohm resistor and PRC230 is not populated. This means that the TLV431 will behave as a regulator. The regulation voltage will be 1.24V.

Best,

Walter

0 Fred Cheng over 2 years ago in reply to Walter Zollinger

TI__Expert 5320 points

Hi Walter,

thanks a lot , so it's same as below picture right?

may I know in what scenario will we use TLV431 create regulated 1.24V?

I mean there lots of regulator solution solution out there. what's the advantage of TLV431 in terms of regulation

0 Walter Zollinger over 2 years ago in reply to Fred Cheng

TI__Expert 7820 points

Hello Fred,

Yes, it is the same as that circuit. The advantage of the TLV431 is the output is very accurate with low temperature drift. The output voltage accuracy for the TLV431A is 1% at 25C. The temperature drift is also very small.

Best,

Walter

0 Fred Cheng over 2 years ago in reply to Walter Zollinger

TI__Expert 5320 points

Hi Zollinger,

but we can't change the regulated voltage, right?

only 1.42V

+1 Walter Zollinger over 2 years ago in reply to Fred Cheng

TI__Expert 7820 points

Hi Fred,

The regulated voltage can be changed from 1.24V to 6V by changing the resistor values PRC229 and PRC230 according to this equation

In the current schematic, the regulation voltage is fixed at 1.24V

Best,

Walter

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TLV431: function of TLV431