Hi, TI expert
I am inquiring about a malfunction in a specific situation during the development review from the customer to BQ24610.
The currently configured Charger circuit and defective symptoms are as follows.
- The circuit diagram DC_PWR has a 19V 3.42A adapter power input.
- Although the 19V adapter is actually used, it should operate normally even with 18V power input considering voltage drop, etc.
- VBAT_PACK is using 4S2P 16.6V 6.4Ah.
1. During the initial development, the design was carried out as the attached circuit.
2. The actual ADT current limit and BAT maximum charging current are significantly below the resistance calculations (but there is no deviation per set)
3. We changed only the PCB (ES2_Board) because the PCB_Artwork was not carried out thinly on the SRP, SRN, ACP, and ACN sensing trace parts of the PCB.
(Refer to the "PCB change" tab in the attachment, ES2 is currently defective BD, ES0 is BD before PCB change)
3. During PCB_Artwork, SRP, SRN, ACP, and ACN sensing trace parts are thin, so only PCB (ES2_Board) was modified.
(Refer to the "PCB change" tab in the attachment, ES2 is currently defective BD, ES0 is BD before PCB change)
4. After changing the PCB, it operated with a current value similar to the actual setting.
5. However, the following symptoms of charging failure occurred.
- When the VSYS is loaded, the ACDRV switching, and the VSYS is powered by alternating adapter power and battery power.
- In the absence of the VSYS load, charging does not work when connecting the battery and the adapter.
7. This symptom occurs frequently when the adapter input is less than 18.5V (actual testing is conducted at 18V)
- For ES0_Board before PCB change, the adapter power input will operate without issue at 17.5V
8. There is no significant difference between the normal board and the defective board, the actual VCC (17V), ACN, ACP, SRP (14.4V), and SRN pin voltage.
(Please refer to the attached file.)
CHARGER_BQ24610RGET_Q_251029.xlsx
9. Bad board R1 → Normal operation with 0 ohm change (However, there is no significant difference between 0 ohm or 10 ohm or actual VCC pin voltage)
Q1) What is the cause of the malfunction?
Q2) Please let me know if there is any improvement plan.
Q3) And, I want to deliver the circuit diagram behind closed doors, so if you let me know your email address, I will send you the circuit diagram by e-mail.
Please let me know if you need additional tests or data.
Thank you.
