Wide input 2W bias power supply reference design

This reference design is a 2W bias power supply for applications requiring operation over a wide input range (110 – 500VAC). The small form factor (69mm x 26mm) and high efficiency of this design make it ideal for e-metering applications. Information provided in this design will reduce time to market by providing important test data such as efficiency, output ripple, startup, and switching stress. Additionally, TI has conducted emissions testing on this design to ensure that it exceeds the EN55022 Class B limits.

Features:
Supports a wide input voltage range: 110VAC – 500VAC
Targeted for small form factor applications (69mm x 26mm)
Greater than 65% efficiency over tested operating range
Achieved voltage regulation of +/-1% at full load
Test results demonstrate this design's capability to pass EN55022 Class B EMC standard

Parts Include:
TLV70433 : 150mA, Ultra-Low IQ, High Vin Low-Dropout Regulator  
UCC28722: Low Cost CVCC Flyback Controller with Primary-Side Regulation for Bipolar Power Device

Learn more by downloading the reference design below