BQ24618:not running

Martin Kovacik

Prodigy 20 points

Part Number: BQ24618
Other Parts Discussed in Thread: BQ24610

Tool/software:

Hello, I made two series charger with BQ24618 and not working neither version for type 5S, Uin=24V.

Output voltage is still 1,8V on pin PH.

I checked everything and I don't know how to proceed.

Thanks.

9 months ago

0 Christian Moyer 9 months ago

TI__Mastermind 31396 points

Hello Martin,

I'm reviewing your schematic, I will provide an update after I gather more information.

Best Regards,

Christian.

0 Martin Kovacik 9 months ago in reply to Christian Moyer

Prodigy 20 points

Hello Christian,

I did some measuring: If is Vcc from 8V to 10V, then output curves HI drv and LO drv are correctly. If Vcc>10V, then curves HI drv is damaget too much and BQ... turns off.

0 Christian Moyer 9 months ago in reply to Martin Kovacik

TI__Mastermind 31396 points

Hello Martin,

Why do you have a 100kohm resistor pulling the gatedrive to GND:

Please follow the recommend schematic checklist:BQ24610_BQ24650_Schematic_Checklist (36).pdf

The BQ24610 is similar to BQ24618, so this schematic checklist can be used for this device as well.

Best Regards,

Christian.

0 Martin Kovacik 9 months ago in reply to Christian Moyer

Prodigy 20 points

Hello Christian, this is to prevent Q1+Q2 from accidentally opening.

Next problem is with high temperature on Q1, when is it without load.

Thanks for schematic, I will check it.

Martin

+1 Christian Moyer 9 months ago in reply to Martin Kovacik

TI__Mastermind 31396 points

Hello Martin,

Please follow the BQ24618 layout guidline:Layout Guidelines and Example (5).pdf

Best Regards,

Christian.

Power management

Power management forum

BQ24618:not running