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Part Number: BQ24650
We have designed our circuit based on BQ24650RVAR reference design. I have attached my charging circuit design. I Have pulled the Term_EN pin to ground so that solar supply continue to operate as buck converter for the load which is around 150mA@12V when solar input is available in order to avoid any battery discharge when sunshine is available. We are using lead acid battery(2.5AH). I have attached spec of my solar panel. We are finding that when the battery voltage reaches around 11.5V, there is steep discharge in the battery voltage which leads to discharge up to 4-5V in very small interval(less than 30min). It goes to deep discharge. Sometimes even if sun is available, battery discharges as battery charger doesn't supply current. During this time, charger goes to fault state. we could see that both Stat1 and Stat2 pins get high(led gets off).
Initially we thought it maybe problem with the solar panel(10W) that current supplied may not be enough for both battery charging and around 120mA load. so we tested with higher capacity(18W) solar panel which i have attached spec. We have observed that once the charger goes to fault state, it remains in fault state and doesn't overcome until the charger is power resetted. After it is power resetted, it regains supplying current to battery and load.
We have tested it on 5units and all units behaved the similar behavior.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
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In reply to kumar singh:
The fault conditions are given in the last row of Table 2 below (STAT1 and STAT2 both off).
The conditions which can cause charging to suspend (as well as all of the conditions that must be true in order for charging to resume) are listed in Section 8.3.7 of the datasheet.
More generally, the application report below provides advice which may be helpful to you.
Applications Engineer | Battery Charging Products
In reply to Angelo Zhang:
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