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BQ76952: LDO输出功耗大,外部NPN发热

Part Number: BQ76952

根据参考设计,电路上电50V有10mA的待机电流,经过断开REG1的3.3V输出,待机电流接近0mA。

测试REG1后面3.3V下负载实际电流为10mA。 即:REG有10mA(3.3V)负载时,输入B+ B-功耗为10mA(50V).NPN三极管则发热。

实际使用型号为BQ7695202(默认输出LDO1)

NPN三极管型号:FCX495TA(参考设计)和图纸型号 测试结果一致。