TOP256YN Off-Line Switching Power Converter IC TO-220-7C

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TOP256YN Off-Line Switching Power Converter IC TO-220-7C TOP256YN Off-Line Switching Power Converter IC TO-220-7C is a high-performance offline switching power converter from the TOPSwitch-HX family by Power Integrations. It integrates a high-voltage power MOSFET, PWM controller, startup circuitry, and comprehensive protection features into a single device, simplifying the design of compact and efficient switch-mode power supplies. The IC provides programmable current limiting, line voltage sensing, soft-start, thermal shutdown, and frequency jittering for reduced EMI, making it suitable for consumer, industrial, and embedded AC-DC power conversion applications. Features Integrated 700V high-voltage power MOSFET. Built-in PWM controller with startup circuitry. Programmable current limit for design flexibility. Line voltage sensing for enhanced protection. Integrated soft-start reduces startup stress. Automatic thermal shutdown protection. Frequency jittering helps reduce EMI emissions. Low standby power consumption. Requires minimal external components. TO-220-7C through-hole package for high-power applications. Specifications Parameter Details Product Type Off-Line Switching Power Converter IC Product Family TOP Switch-HX Part Number TOP256YN Package Y Package, Plastic TO-220-7C Mounting Type Through Hole Integrated Switch 700V Power MOSFET Breakdown Voltage 700V Drain Supply Voltage 18V Control Supply Current 1.6mA Switching Frequency 132kHz Low-Frequency Option 66kHz Maximum Duty Cycle 78% Self-Protection Current Limit 2.371A(Min), 2.55A(Typ), 2.729A(Max) ON-State Resistance (25°C) 2.14Ω ON-State Resistance (100°C) 3.50Ω Leading-Edge Blanking Time 220ns Auto-Restart Upper Threshold 5.8V Auto-Restart Lower Threshold 4.8V Soft-Start Time 10ms PWM Gain -23%/mA Thermal Shutdown Temperature 135°C(Min), 142°C(Typ), 150°C(Max) Thermal Shutdown Hysteresis 75°C Thermal Impedance (Y Package) 80°C/W Output Power (230VAC Adapter) 60W Output Power (230VAC Open Frame) 119W Output Power (85VAC–265VAC Adapter) 40W Output Power (85VAC–265VAC Open Frame) 86W No-Load Power Consumption Less Than 200mW At 230VAC Operating Junction Temperature -40°Cto+150°C Storage Temperature -65°Cto+150°C Dimensions Pinout Pin Number Pin Name Function / Description 1 V (Voltage Monitor) Line voltage monitoring pin used for line under-voltage and over-voltage protection. 2 X (External Current Limit) External current-limit programming pin used to adjust the MOSFET current limit. 3 C (Control) Feedback and control input. Connects to the control bypass capacitor and regulates the output. 4 S (Source) Source terminal of the internal power MOSFET and primary-side ground reference. 5 F (Frequency) Frequency selection pin used to choose or synchronize the switching frequency. 6 NC No internal connection. 7 D (Drain) Drain terminal of the internal high-voltage power MOSFET. Connected to the primary side of the transformer. Applications AC-DC switch-mode power supplies. Industrial power supplies. Power adapters. Battery chargers. Consumer electronic equipment. Home appliance power supplies. LED driver power supplies. Networking equipment. Embedded auxiliary power supplies. Industrial automation systems. Package Contents 1 x TOP256YN Off-Line Switching Power Converter IC TO-220-7C Datasheet TOP256YN