TPS56C215: Power-Up Sequence

T Kishi

Genius 4425 points

Part Number: TPS56C215

My customer has question.

In Figure 27, it is stated that VREG 5 rises when the threshold of EN is exceeded.

This behavior is correct?

If VREG 5 is an internal power supply, I think that PGOOD output is Hi-Z unless VREG 5 rises.

In that case, when EN = Low, the output of PGOOD becomes Hi - Z, but is my understanding correct?

Regard

T Kishi

over 7 years ago

0 Andy Chen over 7 years ago

TI__Mastermind 34835 points

Hi,

Normally there should be minimum VIN for valid PGOOD output which maybe below 2V, let me check it with designer and update you later.

0 Andy Chen over 7 years ago

TI__Mastermind 34835 points

The gate of PGOOD open drain FET is always pull up to VIN, so once VIN is higher than gate threshold, the PGOOD is intend to be low Z no matter what's EN level or VREG5 status is, it will be high-Z only when output is in regulation.

Power management

Power management forum

TPS56C215: Power-Up Sequence