Discharge circuit of HT46RB50 in USB charger - Power Circuit - Circuit Diagram

Industrial Router Crystal 3.2*2.5mm 3225 26M (26.000MHZ) 12PF 10PPM 20PPM 30PPM

MOS power IC full range

Photocoupler

The discharge circuit uses an NPN transistor 8050. When the PA1 outputs a high level (set to about 4.3V), the current between the BEs of the NPN transistor 8050 is Ibe=(4.3V-0.3V)/1K=4mA, and the NPN transistor 8050 is provided. The magnification of 100, then the rated current between the NPN transistor 8050C-E is about 400mA. The battery voltage is set to 1.2 V. Since the voltage between CEs when the NPN transistor 8050 is turned on is 0.3 V, the discharge current is ICe = (1.2 V - 0.3 V) / (5 + 1) = 150 mA.