BQ24075: CHG is low but still no current flowing

Carlos van Rooijen

Prodigy 50 points

Part Number: BQ24075

Hello,

I asked a question before and I changed my design.
The following is happening.

CHG = low (red led is on)

TP3-gnd = 3.96V

iset-gnd = 0v

battery is 3.7v 3000mah

When I disconnect the battery CHG goes high (red led is off).

But when the battery is connected no current seems to be flowing while there should be 500mA pouring in.

This is my design:

Hope to hear from you soon!

Best,

Carlos

over 4 years ago

0 Anthony P Pham over 4 years ago

TI__Mastermind 23410 points

Hi Carlos,

Are you able to measure the current or measure the voltage at ISET (Charge Current Translator Function)? Can you try again with a lower battery voltage such as 3.3V?

0 Carlos van Rooijen over 4 years ago in reply to Anthony P Pham

Prodigy 50 points

I think that the ts resistor should be tied to gnd instead of 5v. Is that correct?

0 Anthony P Pham over 4 years ago in reply to Carlos van Rooijen

TI__Mastermind 23410 points

Hi Carlos,

Oh yes, my mistake I must've missed that in your last thread as well. Yes, that resistor should be tied to ground.

Apologies, please tie the resistor to GND.

0 Carlos van Rooijen over 4 years ago in reply to Anthony P Pham

Prodigy 50 points

I tied it to ground with some hotwiring and now it works. Thanks!

Power management

Power management forum

BQ24075: CHG is low but still no current flowing