Over Current Limiting Operation of LM2842

takahiko yokota

Mastermind 7135 points

Other Parts Discussed in Thread: LM2842, LM2841, LM2840

I have three questions about over current limit operation of LM2842.

1. Short circuit protection

LM2842 has Short circuit protection.

Does it operate by hiccup mode when this device become short circuit?

2. Current protection mode

Does it this device stop the output that it monitors peak current every cycle and if when it exceeds the current limit value?

3. Switch Current Limit vs. SHDN Pin Voltage

As long as I watched fig 9 of datasheet, I think this device can drop current limit value by dropping SHND pin voltage by zener diode.

Is this attitude correct?

Best regards,

Yokota

over 7 years ago

0 Anston Lobo over 7 years ago

TI__Genius 16025 points

Yokota,

We are looking into your request now.

Thanks,
Anston

0 Arief Hernadi over 7 years ago in reply to Anston Lobo

TI__Mastermind 23815 points

Yokota-san,

Please allow us some time to check this on the EVM to answer some of your questions.
As for the 3rd question, SHDN pin vs Current Limit, we do not recommend to use this method to adjust the current limit. I would use the appropriate part either LM2840/LM2841/LM2842 for your application depending on your load current

Thanks
-Arief