PTN04050C: Used in inverting application

TISL

Expert 3795 points

Part Number: PTN04050C
Other Parts Discussed in Thread: TPS82130

Dear support,

Could you confirm if this power module could support inverting applications, such a 3Vin to -12Vout?

Regards,

over 2 years ago

0 TISL over 2 years ago

TI__Expert 3795 points

Anyone?

0 Wenhao Wu over 2 years ago in reply to TISL

TI__Genius 9046 points

Hi Sir,

You may need to look for a buck module. Buck can convert positive to negative with inverting buck-boost topology and boost can convert negative to positive.

TPS82130 can do this, but you still need to double check with relevant Buck team for this request.

See below application note for further details:

Using the TPS6215x in an Inverting Buck-Boost Topology

-Wenhao

0 David_Daniels over 2 years ago in reply to TISL

TI__Genius 16640 points

You can use a step down converter or module to get -12V from 3V.

Use the equation 1, 3, 4 and 5 in https://www.ti.com/lit/an/slva317b/slva317b.pdf to convert the inverting spec to step down specs.

Use equation 3 to determine the minimum vin spec of the step down.

use equation 1 to determine the device max voltage device max voltage needs to greater than Vin max + /Vo/

use eq 4 and 5 Make sure the minimum current limit of device is high enough for output current

Using vin min, vin max and Io (Iclx1.3 to 1.5) to narrow search.

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PTN04050C: Used in inverting application