3W low cost and high efficiency constant voltage / constant current charger circuit design

Heng Jiaxing AO3401

Probe current voltage pin 420*4450 head diameter 5.0 over current current and voltage pin

1.5PF SOT23-6 Low Capacitance 5V Breakdown Voltage 6V SRV05

High-power led lamp beads 1W white light Sanan 30mil high power LED lamp beads imitation lumens

Photocoupler

Summary:

working principle

The LinkSwitch-LP flyback power supply can be used to convert an AC input voltage from 90 VAC to 265 VAC to a single isolated DC output voltage as shown. The power supply output is 2 V, 1.5 A (3 W) with constant voltage/constant current (CV/CC) characteristics. Typical applications include those that use a single rechargeable battery for an electric hair clipper and a repairer.

design feature

• High efficiency (>60% under full load)
• Low cost, low component count, compact and lightweight, alternative to linear power supply design
• No optocoupler required
• No constant current detection resistor required
• Extremely energy efficient
• Meets CEC/Energy Star 2008 requirements for working mode efficiency (requires 59%, up to 64%)
• Low input power at no load (less than 300 mW at 230 VAC AC input, 500 mW required)
• Excellent constant voltage/constant current characteristics at different temperatures
• Compliant with CISPR-22/EN55022 B conducted EMI limit, margin exceeds 8 dBμV

See the PDF document for details (click on the PDF file to download)