TPS62901: TPS62901 is Blowing Up When Using 12V AGM Battery

Hi,

This device can be used with 12V battery.

What is your schematic?

Thanks,

Colin

Hi,

Completely randomly, my component glitches when I connect my board to a 12V lead-acid battery (NP7-12 Yuasa).

Thanks

Hi Richard,

Are you using long wires to connect it to the battery. If yes, you should add a large EC capacitor at the input.

Because the long wire acts like an inductor and resonates at the input. This can cause VIN to be greater than 17V and damage the device.

Colin

Hi Colin,
Thank you for your reply.
I am using short wires (30cm).
I will add a capacitor as you suggested, and I am also considering adding a resistor in series (20 Ohms) on the +12V to dampen the input signal.
What do you think?
Do you have any other ideas?
Thanks in advance.

Hi Richard,

I don't think 30cm is considered a short trace. I think it's a testing issue and won't occur in real applications.

It's better to add a 1 ohm resistor to the 12V trace and add an EC capacitor for damping.

Colin

In my real application, the installation will be identical.
I will try with the resistor and the capacitor.
Can I also add a freewheeling diode?