•General Description：U3210A is a high-performance low-cost PWM control power device which is suitable for off-line low-power step-down applications. With simple  peripheral circuits Simple and a small number of components  , the product startup module has built-in high resistance Voltage (500V)MOSFET that can improve the surge withstand capability.Unlike traditional PWM power switches, U3210 has no internal Drive MOSFET with fixed clock, system switching frequency varies with load change, thus can realize automatic adjustment. At the same time, the chip uses multi-mode PWM Control technology which can effectively simplify peripheral circuit  ,improve linearity adjustment rate and load adjustment rate and eliminate audible noise while working. In addition, the internal peak current detection threshold can automatically adjust with the actual load situation, which can effectively reduce standby power consumption under  no-load condition. U3210A has the  protection function of self-recovery  :VDD under-voltage protection, cycle-by-cycle current limit, output over voltage protection,Overheating protection, overload protection and VDD over voltage protection, etc.

• Main features: Integrated 500V high voltage starting circuit; Multi-mode control, no noise work; Support step-down and step-down topology; Default 12V output (FB pin suspended); Standby power consumption less than 50mW; Good linear adjustment rate and load adjustment rate; Integrated soft start circuit; Internal protection function: Overload protection (OLP); Cycle by cycle current limitation (OCP); Output overvoltage protection (OVP); VDD overvoltage, undervoltage and voltage clamp protection
• Typical applications: small household appliance power supply, industrial control
• Typical application circuit

Download the specification here