5W general input constant voltage/constant current charger power circuit

Published:2011/6/20 2:49:00 Author:TaoXi | Keyword: 5W, general input, constant voltage, constant current, charger, power circuit | From:SeekIC

The 5W general input constant voltage/constant current charger power circuit is as shown in the figure, this design uses the Power Integrations's LinkSwitch-II series product LNK-616PG. This design is very suitable for the cellphone or the USB charger applications such as the cell phone battery charger, the USB charger and the constant pressure/constant current applications. As the response of the voltage droping of the pin-FB, the switch frequency will reduce too, so as to realize the linear constant current output. The RCD-R ground-clamp circuit is composed of the D5, R3, R4 and C3, it can be used to limit the drain voltage peak which is caused by the leakage inductance. The resistor R4 has large value to avoid the drain voltage waveform oscillation which is caused by the leakage inductance, this can improve the voltage stability and reduce the EMI generation.



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/Power_Supply_Circuit/5W_general_input_constant_voltage_constant_current_charger_power_circuit.html

Print this Page | Comments | Reading(3)