TPS23754: TPS23754PWP for short-circuit detection,

John Lin41

Part Number: TPS23754

When the TPS23754 for short-circuit detection,
Although the IC turns off, without output voltage, but still have output current,
and PWM is still oscillating, the PWM frequency has not changed.
Only the Duty H/L ratio is changed.
PR9(Rcs)=0.13，Io=5.xA，Vo=2V
PR9(Rcs)=0.26，Io=4A，Vo=0.09V

I would like to ask:
1. How can i modify, there will without output voltage and current when short-circuit.
2. What is the mechanism of PWM when short circuited? Change the Duty H/L ratio? Change the PWM frequency?
3. What is the CS calculation formula?

If need schematic plan, please provide email.

over 7 years ago

0 Darwin Fernandez over 7 years ago

TI__Mastermind 41770 points

Hi John,

Given the US holiday, this post may be delayed; however, an answer will be posted as soon as possible. Thanks!

0 Eddie Chou over 7 years ago in reply to Darwin Fernandez

TI__Expert 6190 points

Hi Team,

Any update? thanks.

Eddie Chou

0 Eddie Chou over 7 years ago in reply to Eddie Chou

TI__Expert 6190 points

Hi Team,
We informed customer that TPS23754 may enter to hiccup mode if overcurrent. however customer would like to know how TPS23754 send an alarm signal to CPU while the power source is not enough. thanks.
Eddie Chou

0 Thomas Amlee over 7 years ago in reply to Eddie Chou

TI__Genius 9230 points

Hi Eddie,

Is the CPU on the PD or PSE side of the cable? If it is on the PD side, is the CPU be powered by the secondary side of the power converter?

The PSE should throw a flag if an overcurrent event is triggered.

- Tom