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TOP256PN

TOP256PN

Power Integrations
Converter Offline Flyback Topology 66kHz 8-PDIP-C
Active2,116 in stock
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Overview

The TOP256PN is an integrated offline switcher IC from the TOPSwitch-JX family, combining a 700V power MOSFET with a high-voltage switched current source and PWM control. It uses a flyback topology to provide up to 34W of output power while incorporating EcoSmart technology for high energy efficiency across the entire load range.

Why Choose This Part

The device features multi-mode operation for maximized efficiency and a 78% duty cycle capability for flexible transformer design. Integrated safety features include accurate hysteretic thermal shutdown and line overvoltage shutdown, while the 7-lead PDIP package provides extended creepage between the high-voltage DRAIN and other pins for improved reliability.

Applications

LCD Monitor Power Supplies
Efficient main power conversion for desktop displays and signage.
LED Lighting Drivers
Constant current or constant voltage drivers for commercial lighting applications.
Adapter/Chargers
Universal input AC-DC adapters for laptops and consumer electronics.
Industrial Auxiliary Supplies
Robust bias power for industrial control systems and motor drives.

Key Specifications

Topology Flyback
Duty Cycle 78%
Mounting Type Through Hole
Power (Watts) 34 W
Package / Case 8-DIP (0.300", 7.62mm), 7 Leads
Fault Protection Current Limiting, Over Temperature, Over Voltage
Output Isolation Isolated
Internal Switch(s) Yes
Voltage - Breakdown 700V
Frequency - Switching 66kHz
Operating Temperature -40degC ~ 150degC (TJ)
Supplier Device Package 8-PDIP-C

Getting Started

Designers should use the PI Expert Suite software to automate transformer design and component selection for the flyback circuit. When prototyping on the 8-DIP footprint, ensure the PCB layout follows manufacturer guidelines regarding the Kelvin connection for the SOURCE pin and heat sinking via the copper planes. Evaluation boards like the RDK-242 demonstrate high-efficiency performance for specific power targets.

Also Consider

VIPER22ASTR-E STMicroelectronics - Alternative primary-side switcher for lower power flyback designs with different fault protection characteristics.