LM26003: Check the VBIAS Pin of LM26003 for Inverting Applications

Louis Han15

Genius 4680 points

Part Number: LM26003

Hello

My customer designed inverting circuit using LM26003.

VIIN : +15V

VOUT : -12V

However, the maximum VBIAS voltage is 10V. Is it available to configure the circuit as shown below?

Best regards.

over 3 years ago

0 Daniel Li14 over 3 years ago

TI__Mastermind 27470 points

Cause Vout is -12V, which will make Vbias over voltage in your circuit. So suggest put a 8.2V or 9.1V zener connect to VBIAS and -12Vcc. And using a ~200ohm limit the current from GND to VBIAS. The resistor can’t be too large which will limit the current into the bias .

0 Louis Han15 over 3 years ago in reply to Daniel Li14

Genius 4680 points

Hi Daniel

Thanks for your support.

If not using the VBIAS pin, do i connect it to -12V?

Best regards.

+1 Daniel Li14 over 3 years ago in reply to Louis Han15

TI__Mastermind 27470 points

Hi Louis:

yes, connect to -12V is the right way.

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LM26003: Check the VBIAS Pin of LM26003 for Inverting Applications