Circuit design of 1.2W, non-isolated dual output power supply for white goods

Probe domestic double-head probe 038-BB-5.7L The shape of the two ends of the needle is outside the pointed needle

0603 white

Summary:

The following circuit provides two outputs: –5 V and +7 V. The load is referenced to the –5 V output to produce 5 V and 12 V outputs, 5 V drive control circuit, and 12 V output to the relay.

This circuit is especially useful for triac applications that require a negative gate voltage to drive. Since the gate of the thyristor is referenced to the RTN/N line, the gate of the triac can be driven with a signal between 0 V and –5 V when it is referenced to the –5 V output (VEE). (RTN/N).

design feature

• Universal input voltage range
• Excellent regulation: ±12 V to ±8% and 5 V to ±5% (including line voltage, load variation and tolerance)
• With temperature compensation
• Low standby power consumption: 230 VAC, <300 mW at 50 mW output
• Meets CISPR-22/EN55022B conducted EMI limits with >10 dB margin

Circuit diagram of 1.2W, non-isolated dual output power supply

See the uploading documentation for details (click to download)