BQ24610: 16V Input Normal work but 24V Input BQ24610 damage

tony li61324

Intellectual 500 points

Part Number: BQ24610

Hi Tier

I us BQ24610 encountera problem :

1、16V input work ok

2、24V input normal work, about 30 minutes later.Inductance and BQ24610 heating.until the device is damaged.

How to solve this problem？

over 7 years ago

0 ezhao over 7 years ago

TI__Genius 10240 points

Tony,

First, you want to check the PH node and make sure the voltage is not higher than 30V. It is more likely that the power loss is too high for 24V operation. The options to reduce the power loss are:
- use lower Rds-on FETs and lower DCR inductor
- improve PCB layout to increase the copper areas for FET heat dissipation.

0 tony li61324 over 7 years ago in reply to ezhao

Intellectual 500 points

Thank you for your reply.

1, test PH pin Vmax=28.4V using an oscilloscope .

2. Changed low rds the MOSFET. and changed low DCR inductor.

but the heat is still very large

0 ezhao over 7 years ago in reply to tony li61324

TI__Genius 10240 points

Tony,

It looks like the layout is the one of the reasons. The copper area for thermal dissipation is enough. The switching loss is increased for higher voltage operation. You can refer to the EVM and put enough copper area for thermal dissipation.

0 tony li61324 over 7 years ago in reply to ezhao

Intellectual 500 points

Thank you for your reply！

Whether you can supply source files about BQ24610 EVM。thanks！

0 tony li61324 over 7 years ago in reply to tony li61324

Intellectual 500 points

Three times PCB has the same problem

0 Kedar Manishankar over 7 years ago in reply to tony li61324

TI__Mastermind 24075 points

Hello Tony,
You can follow this link: www.ti.com/.../bq24610evm and scroll down to software for download.

Power management

Power management forum

BQ24610: 16V Input Normal work but 24V Input BQ24610 damage