1. Input power supply, solar panels. Specification: 9-12V/2A max
2. Charging voltage preset value 8.4V
3. Output is connected to the heating plate. Specification: 8-9V/500-800mA
The reason for using this chip as a DCDC is that relying on the VINdpm of the charging IC, when the input source power is insufficient, it can limit the input source from being pulled short circuited.
Question:
1. According to the specifications, this chip has a battery detection function. The bat pin is directly connected to the heating element, and a large capacitor in parallel can be used to ensure the normal operation of the charging IC as an equivalent battery.
2. Debugging other charging chips, it was found that when the IINdpm setting is too large, the minimum charging current supported is also relatively high (such as IINdpm 3A with a minimum charging current of 1A and IINdpm 1A with a minimum charging current of 0.3A). If it is less than this value, the charging IC will intermittently switch. Currently, this IC is 3A, is there any such issue.