TPS54140A: About enable control in Split-rail topology

teritama

Expert 1965 points

Part Number: TPS54140A

Hi team,

Our customer using TPS54140A by Split-rail, and want to control Enable with external signal.

The use condition is Vin=15, Vout=±14V

In my understanding It is needed level shifter circuit when control enable. Do you have reference circuit that use Split-rail and enable control.

Or are there recommend level shifter product in this case?

Best regards,

teritama

over 1 year ago

0 Ridge Lahti over 1 year ago

TI__Mastermind 18545 points

Hi teritama,

The EN level shifter in a split-rail design is the same as an inverting buck boost (IBB) design because the IC ground is referenced to -Vout in both cases. Please refer to Section 4.1 of the following application note for an example EN level shifter: https://www.ti.com/lit/an/snvaa61/snvaa61.pdf

For reference on the split rail topology, please refer to this application note: https://www.tij.co.jp/lit/an/slva616/slva616.pdf

Best regards,

Ridge

0 teritama over 1 year ago in reply to Ridge Lahti

Expert 1965 points

Hi Ridge,

Thank for reply.

About UVLO setting, in snvaa61 level shifter use resister divider(100kohm x 2).

When we want to adjust UVLO threshold, it is okay that change this divider register value?

Best regards,

teritama

+1 Ridge Lahti over 1 year ago in reply to teritama

TI__Mastermind 18545 points

Hello,

You can change the resistor divider.

Best regards,

Ridge

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TPS54140A: About enable control in Split-rail topology