• Description :U8122EC is a high performance, low cost primary side control power switch, built-in high voltage power transistor, can provide high precision constant voltage and constant current output performance, especially suitable for low power off-line charger applications. The U8122EC can work without sound, while ensuring excellent dynamic performance. High performance constant voltage output is achieved with integrated line loss compensation. The U8122EC integrates a variety of protection features: Such as VDD undervoltage protection (UVLO), VDD overvoltage protection (OVP), cycle duration current protection (OCP), short circuit protection (FB SLP), output overvoltage protection (FBOVP), overheat protection (OTP) and VDD clamping. The U8122EC is also integrated with single point failure protection of the power system, which can realize protection under the fault conditions of FB pull-down resistance open circuit, FB pull-down resistance open circuit, FB pull-down resistance short circuit, output diode or SR open circuit, output diode or SR short circuit, transformer winding short circuit, RCS open circuit, etc.

• Main features: integrated 800V high voltage power triode; Bottom opening, original side control, high system efficiency; Multi-mode primary edge control; l Excellent dynamic response; l integrated dynamic triode driver circuit; Optimized EMI performance; Work sounds no different; Constant current, constant voltage adjustment rate is less than ±5%; Ultra-low standby power consumption <50mW,OUT:5V2A; Line loss compensation function; Integrated protection features: Output short circuit protection (FB SLP), output overvoltage protection (FBOVP), cycle duration current protection (OCP), overheat protection (OTP), VDD overvoltage, undervoltage and clamping protection.

• Typical applications: mobile phone charger, AC/DC power adapter

• Typical application circuit  

Download the specification here