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| LM5176-Q1: Is there a way to charge 3A CC-mode? -LM5176-Q1 | |
| Part Number: LM5176-Q1 I will design a battery charging circuit with the LM5176. I want to charge 3A CC-mode, is it possible? If Hiccup or Average Current Limit is off, the current will flow over 3A without limitation. And if I turn on the two functions, I think that the current will rise and the charging will end at 3A. In general, the battery will be charged by CC-CV, so the cut-off time will be very short. I cannot use Chager IC because I have to use AEC-Q100 certified product. As far as I know, BQ24616 etc. do not have AEC-Q100. Is there a way to charge 3A CC-mode? Vin: 10 ~ 16V, Vout: 14.6V / 3A, and there is an immutable fuse in the Vin line, so you must limit the current. | |
| Hi BAKE KI, Thank you for reaching out with your question and for considering the LM5176 in your design. The LM5176 can be configured to output a constant current using the average current limiting feature. Placing a resistor between the ISNS+ and ISNS- pin will limit the current when the voltage drop across the resistor is 50mV. Please let me know if you have any other questions. Thanks, Garrett | |
| Thank you so much for answering. The battery capacity is 7.2 Ah. What resistance should I use for 3A CC charging? If you use 0.015 ohm for the sensing resistance between ISNS + and ISNS -... Is 45mV when charging at 3A, and 51mV at 3.4A to cut off the current? If it is correct ... I think that as soon as the charging starts, the current will flow more than 3.4A, and the charging will end within a few seconds. | |
| Hi BAKE KI, It is possible to add multiple resistors in parallel to set a static current limit for the average output current. 17mOhm will set the typical output current to 3A Please let me know if you have any questions. Thanks, Garrett | |
| 3.3A CC-Mode operation was confirmed by applying a 15mΩ resistor. All thanks to you. Can the input current be maintained at 3A by changing the 15mΩ resistor position to Input? | |
| BAKE KI, Yes moving the resistor to the input voltage rail will be used to limit the input current. Thanks, Garrett | |