GeneralDescription

SM7525 is a primary sidefeedback controlling power chip used in off-line small power AC/DC switchingpower. It realizes high precision (less than ±5%) constant current output underuniversal input voltage. The circuit is no loop compensation and savesopto-coupler, L431, transformer auxiliary winding and other components toreduce the cost.

The circuit integrates cycle by cycle peak current limiting, FBovervoltage protection, output open/short protection and soft-start, whichoptimize the reliability.

Features

l Topological structure support: Fly-back and low-cost BUCK-Boost

l Integrated730V hybrid techno- logy

l Universal input voltage: 85Vac~265Vac

l Constant current precision less than ±5%

l Full voltage compatible with 1~5W

l SunMoon patented no auxiliary winding of primary side feed-back controltechnology without coupler, 431 and other compo-nents.

l No loop compensation

l Built-in LEB circuit

l Cycle by cycle peak current limiting

l Output open/short circuit

l Built-in soft-start

l Built-in overvoltage protection and short circuit protection

l Package：SOP8

Applications

u  LED lightingdriver

Typical Application