BQ24610: No Charging in Circuit and always STAT1 LED ON

Thanks for your reply!

I am sending the graphics and circuit schematic you want in the attached rar file. I took the graphs in two different condition, with and without the battery connected, to show the change in the PH node. I did not add the charge current graph to the graphs as the charge current never occurred.

As seen in the graphics, the adapter voltage is 24 Volts and the battery voltage is 16.8 Volts. The VRECH value was adjusted according to the battery voltage by choosing the feedback resistors 910K and 130K.

As I mentioned in the previous message, the STAT 1 LED is on when the battery is connected or not. No charging current was observed in the circuit fed with the power supply

.8081.BQ24610.rar

Hi Yasin,

Our office is closed in observance the Presidents Day Holiday. We will get back to you by 02/23 after we return to the office.

Best regards,

Eric

Thanks for your reply!

With the change of REGN capacitor only REGN voltage dropped 6.80 to 6.40. No other changes were observed in the circuit.

Dear Yasin,

I am confused by your waveforms. What battery voltage is being applied to the circuit? What is the output voltage measuring (is it SRN)? If you applied a battery to the circuit then SRN should have the battery voltage on it.

In addition, can you try out another IC? The recommend operating condition for REGN is up to 6.5 V (and for Absolute Maximum it is 7 V), which was being exceeded previously. From the datasheet, "functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability."

Thanks,

Mike Emanuel

Please click "Resolved" if this answered your question.

In the sent waveform, the voltage of the SRP pin is sent as the adapter voltage. Sorry for misunderstanding.

When the SRN leg was measured, it was observed that it was equal to the adapter voltage. In another IC, the same problems were observed and the REGN voltage was read at the same value. While the REGN voltage is 6.8, there is another circuit whose charge cycle is working smoothly, is it possible that the problem in this circuit is elsewhere?

Dear Yasin,

Can you please explain which waveform is which? You said, "In the sent waveform, the voltage of the SRP pin is sent as the adapter voltage." Does this mean the SRP voltage is 26 V? If so, why is a 26 V battery being applied to a 16.8 V configuration? Please help me to understand more what each channel is and what voltage is being applied to the battery.

Thanks,

Mike Emanuel

The output voltage in the sent waveform is taken as equal to the SRP voltage. For the SRN pin voltage it's equals to battery voltage which is 16 Volt for last measure. Adapter voltage is 24 Volt and PH node waveform is same with the sent waveform.

In testing with another IC, it was observed that the SRP voltage was equal to 16V when the battery connected. While the battery was not connected, the SRP voltage again was measured around 920 mV.

When the battery voltage was discharged to 12V and tested, no change was observed in the charging cycle or charging current.

Dear Yasin,

When the battery is not connected the part should go through battery detection as shown in Figure 18 of the datasheet.

What is physically different between the board that is working and the board that is not working? We need to deep dive into this. What happens if you remove the IC from the board that does not work and replace it with the IC that does work?

Thanks,

Mike Emanuel

The difference between the two cards is that the NMOS and PMOS preferred in the circuits are different. The routes in the circuits and the placement of the components are also different from each other at some points.

I will have written the results obtained as a result of the IC replacement in another message during the day.

Dear Yasin,

I await your results.

Thanks,

Mike Emanuel

Sorry for the delay.

As a result of the change of ICs, there was no change in the card. The problems continues in the same way.

Yasin,

You said that the "NMOS and PMOS preferred in the circuits are different. The routes in the circuits and the placement of the components are also different from each other at some points." This seems like a board differences issue. Do all boards similar to the working board work and all boards different not? What happens if you place an IC from the non working board onto the working board? Does it work?

Regards,

Mike Emanuel

IC change does not affect the operation of the cards. Working cards continue to work, and non-working cards continue to not work.

Are the NMOS and PMOS preferences selected for the circuit whose schematics above correct? Since one of the main differences is those mosfets, we think that's the problem. Also, can we consider the circuit drawing differences between the two circuits as another problem?

NMOS used in the working circuit are NCE4009S, PMOS are IRF4905.

In the non-working configuration, NMOS is P54B4SN-5071 and PMOS is IXTA76P10T.