TPS5450: Please review schematic VIN:12V, VOUT:-5V

Katsu Matsunaga

Expert 7730 points

Part Number: TPS5450

Hi,

Please review below schematic which is VIN=12V and VOUT=-5V (negative voltage)

best regards,

Katsu

over 5 years ago

0 Iven Su over 5 years ago

TI__Expert 8245 points

Hi,

Can you specify what's the value of R10, C8, R9? Are they not populated? And what's part number of CR1? Thanks.

0 Katsu Matsunaga over 5 years ago in reply to Iven Su

TI__Expert 7730 points

Hi Ivan-san,

Thank you for your support.

let you know the value of components.

R10: open or 39ohm

C8: open or 1000pF (these are snubber circuit)

R9: open (to adjustment of output voltage)

CR1: M2FH3-5063 (ShinDengen)

best regards,

Katsu

0 Iven Su over 5 years ago in reply to Katsu Matsunaga

TI__Expert 8245 points

Hi,

For the 5V output, you can use a smaller inductor. I think 15uH should be fine. Besides, please make sure the RMS and saturation current of inductor can support your load. Thanks.

0 KENTA over 5 years ago in reply to Iven Su

Prodigy 20 points

Hi,

Thank you for your support.

The inductor has enough margin for the load current.

Because a predecessor chose it about the inductor, the reason is unclear.

(150uH)

Best Regards

KENTA

0 KENTA over 5 years ago in reply to Iven Su

Prodigy 20 points

Hi,

Thank you for your support.

The inductor has enough margin for the load current.

Because a predecessor chose it about the inductor, the reason is unclear.
(150uH)

Best Regards

KENTA.

0 Katsu Matsunaga over 5 years ago in reply to KENTA

TI__Expert 7730 points

Hi,

15uH inductor will be considered.

is there any other concern in the schematic?

Best regards,

Katsu

0 Iven Su over 5 years ago in reply to Katsu Matsunaga

TI__Expert 8245 points

Hi,

The TPS5450 setup is OK from schematic if CR1 also meets your load. Thanks.

Power management

Power management forum

TPS5450: Please review schematic VIN:12V, VOUT:-5V