TPS65105: Power Sequence

FRANK1

Expert 8535 points

Part Number: TPS65105

Hi Team,

A customer has 2 power supplies in his design,

one coming from TPS65105PWP regulator.

Is there any way I can produce delay to AVDD?

Thanks for your advice.

over 4 years ago

0 Liaqat Khan over 4 years ago

TI__Mastermind 18550 points

Hello,

Please see application note linked below that describes a circuit to introduce delay for AVDD supply rail.

https://www.ti.com/lit/an/slva192/slva192.pdf?ts=1621475235875&ref_url=https%253A%252F%252Fwww.google.com%252F

Kind Regards,

Liaqat

0 FRANK1 over 4 years ago in reply to Liaqat Khan

TI__Expert 8535 points

Hi Liaqat,

My requirement is that I want TPS65015 regulator to turn ON after 10ms of power ON.

Is it possible to create delay with RC circuit only?

Kindly suggest.

Regards,

0 Liaqat Khan over 4 years ago in reply to FRANK1

TI__Mastermind 18550 points

Hi Frank,

From your earlier post, it appeared that you only wanted to change AVDD sequencing (VO1) with respect to VGH/VGL (VOUT2/VOUT3) and that is why I had sent the app. note.

If you want to delay the whole TPS65105 regulator turn on, please use TPS65105 EN signal to delay its turn on. You can use the same enable signal that is used for previous regulator but simply insert an appropriate RC delay in front of TPS5105 EN signal.

Kind Regards,

Liaqat

0 FRANK1 over 4 years ago in reply to Liaqat Khan

TI__Expert 8535 points

Hi Liaqat,

Thanks for your update.
1. Can I use 1.8V signal to enable the device?
2. is it possible to delay by pulling EN to Vin with RC delay? will it affect?

+1 Liaqat Khan over 4 years ago in reply to FRANK1

TI__Mastermind 18550 points

Hi Frank,

A1. Yes, customer can use 1.8V signal to enable the device (min. spec. for logic high is 1.5V)

A2. Yes, EN can be delayed by pulling it to VIN through a RC delay. Again, min spec. for logic high on EN/ENR is 1.5V.

Kind Regards,

Liaqat

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TPS65105: Power Sequence