U3223E

U3223E is a high-performance, low-cost PWM-controlled power switch designed for offline low-power buck applications. It features a simple peripheral circuit with a minimal component count. The device integrates a built-in high-voltage MOSFET to enhance the system's surge withstand capability. Unlike conventional PWM controllers, U3223E has no fixed internal clock to drive the MOSFET; instead, the switching frequency automatically adjusts based on load conditions (light load or heavy load). The device employs multi-mode PWM control technology, which effectively simplifies peripheral circuit design, improves line regulation and load regulation, and eliminates audible noise during system operation. In addition, the internal peak current detection threshold automatically adjusts according to actual load conditions, helping to reduce standby power consumption at no load. U3223E integrates comprehensive self-recovering protection features, including VDD undervoltage protection, cycle-by-cycle current limiting, output overvoltage protection, overtemperature protection, overload protection, and VDD overvoltage protection.

Applications

• Small appliance power supplies
• Industrial control

Key features

• Integrated 5A 200V MOS
• Integrated 200V high-voltage startup circuit
• Operating range: VIN-VOUT > 3V, Ipk < 3A
• Compatible with BUCK and BOOST topologies
• Low power mode operation support
• Buck and buck-boost topology support
• Standby power consumption < 50mW
• Excellent line regulation and load regulation
• Integrated soft-start circuit
• Internal protection features: overload protection, cycle-by-cycle current limiting, output OVP, VDD overvoltage, undervoltage, and voltage clamp protection