TPS61391: Maximum Current Output

Joshua Salinas

Part Number: TPS61391

Hello Team,

A design requires a voltage of ±80V to power an amplifier. Looking at the TPS61391 datasheet and EVM, it seems this part will work.

If I'm using the EVM as reference and outputting ±80V, what's the maximum output current the device can support? Figure 2 in the datasheet says the maximum current is 8mA at ~40V.

Is this true at 80V? Should we expect similar currents at -80V?

Regards,

Josh

10 months ago

0 Lei Zhong 10 months ago

TI__Genius 12640 points

Hi Joshua,

What's the input voltage for TPS61391 in the application to power the amplifier?

Vin is needed to calculate the max Iout.

Regards

Lei

0 Joshua Salinas 9 months ago in reply to Lei Zhong

TI__Genius 9140 points

Hello Lei,

Input voltage will be 5V.

Regards,

Josh

+1 Lei Zhong 9 months ago in reply to Joshua Salinas

TI__Genius 12640 points

Hi Joshua,

While converting from 5V to 80V, the max Iout is around 24mA.

If a charge-pump is used to generate +80V and -80V, then the total max Iout from +/- 80V is around 24mA. Suppose the output current is distributed equally, then 12mA at +80V and 12mA at -80V.

Regards

Lei

0 Joshua Salinas 9 months ago in reply to Lei Zhong

TI__Genius 9140 points

Hello Lei,

Thank you for your response!

Regards,

Josh

Because of the Thanksgiving holiday in the U.S., TI E2E™ design support forum responses may be delayed from November 25 through December 2. Thank you for your patience.

Power management

Power management forum

TPS61391: Maximum Current Output