TPS563200: TPS563200 Enable pin logic treshold

Jun Jinwook

Prodigy 25 points

Part Number: TPS563200

Hi my name is Jun

Now I am designing using TPS563200

DC_IN: 12V

DC-DC output: 3.3V

I want DC-DC output to operate after DC_IN: 6V

I tried to design by distributing the resistors on the EN pin

but I cannot choose the register value because Ven(L) and Ven(H) treshold value gap too big

please check how to do it

over 1 year ago

+1 Zixu Wang over 1 year ago

TI__Expert 8100 points

Hi Jun,

If you only want to have part started after Vin=6V, R148=51k and R179=10k would be ok for your application.

BTW, please remove C86 since large capacitor would cause delay for EN signal.

BRs

Zixu

0 Jun Jinwook over 1 year ago in reply to Zixu Wang

Prodigy 25 points

Thank you very much~!

0 Zixu Wang over 1 year ago in reply to Jun Jinwook

TI__Expert 8100 points

Hi Jun,

Sorry for my wrong result of calculation, I use 12V instead of 6V in EN threshold calculation.

For correct answer, R148=27.5k + R179= 10k or R148=55k + R179=20k

This would make sure that TPS563200 start after 6Vin.

BRs

Zixu

0 Jun Jinwook over 1 year ago in reply to Zixu Wang

Prodigy 25 points

Hi Zixu

Thank you for your reply

You suggest (R148=27.5k + R179= 10k or R148=55k + R179=20k) :

calculation) When Vin is 6V => EN pin is 1.6V

Real) DC-DC is already 3.3V output When EN pin is about 1.0V

I think below is same issue

how do I modify the resistor value?

0 Zixu Wang over 1 year ago in reply to Jun Jinwook

TI__Expert 8100 points

Hi Jun,

I will check it and give you feedback soon!

BRs

Zixu

+1 Zixu Wang over 1 year ago in reply to Jun Jinwook

TI__Expert 8100 points

Hi Jun,

Based on ds, 1.6V is guaranteed value to enable All parts. Due to variation between different parts, EN rising threshold could be different in each part.

So 1.0V could not be used as standard to guarantee all parts start. Please follow my advice on EN resistors.

BRs

Zixu

0 Jun Jinwook over 1 year ago in reply to Zixu Wang

Prodigy 25 points

Thanks a lot ~! Zixu

0 Zixu Wang over 1 year ago in reply to Jun Jinwook

TI__Expert 8100 points

Hi Jun,

Really welcome! If no further question, I will close the thread.

BRs

Zixu

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TPS563200: TPS563200 Enable pin logic treshold