TPS2559: Power management forum

Joanne Gu

Part Number: TPS2559

Our customer did a EN's drop time test about TPS2559. When they set EN signal had a 0.2ms drop, Vout did not have a response and still had a high level output.

So what is the pulse width requirement of EN pin to achieve power-off and power down?

over 2 years ago

0 Kuno Wu over 2 years ago

TI__Mastermind 18556 points

Hi Joanne,

Will reply to you soon.

Thanks,

Kuno.

0 Ziv Zhang over 2 years ago

TI__Mastermind 18031 points

The part doesn't have output discharge function.

As pulling down EN pin, short output to GND and validate whether VOUT voltage rise up or not.

0 Joanne Gu over 2 years ago in reply to Ziv Zhang

TI__Prodigy 160 points

Hi Ziv,

As the picture shows, when the time of pulling down is 2.9ms, Vout has a little drop. When the time of pulling down is 0.2ms, Vout still keep a high voltage.

"The part doesn't have output discharge function." Does this means even if a logic low voltage was given to EN pin, TPS2559 was turned off but still have a high output voltage because it didn't have discharge function?

0 Kuno Wu over 2 years ago in reply to Joanne Gu