Description

TOP256 is an electronic component model that belongs to the AC DC Converters and Offline Switchers product category. It is a cost-effective solution that incorporates various features and functionalities onto a monolithic device. One of its key components is a 700 V power MOSFET, along with a high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, fault protection, and other control circuitry.

Specifications and features

TOP256 offers several advantages and features, including:

• Lower System Cost
• Higher Design Flexibility
• Multi-mode operation for maximum efficiency at all loads
• New eSIP-7F and eSIP-7C packages
• Low thermal impedance junction-to-case (2 °C per watt)
• Low height, ideal for space-limited adapters
• Simple mounting using a clip to aid low-cost manufacturing
• Horizontal eSIP-7F package for ultra-low height adapter and monitor applications
• Extended package creepage distance from DRAIN pin to adjacent pin and to heat sink
• No heat sink required up to 35 W using P, G, and M packages with universal input voltage, and up to 48 W at 230 VAC
• Output overvoltage protection (OVP) that is user programmable for latching/non-latching shutdown with fast AC reset
• Allows both primary and secondary sensing
• Line undervoltage (UV) detection that prevents turn-off glitches
• Line overvoltage (OV) shutdown that extends line surge limit
• Accurate programmable current limit
• Optimized line feed-forward for line ripple rejection
• 132 kHz frequency (254Y-258Y and all E/L packages) that reduces transformer and power supply size
• Half frequency option for video applications
• Frequency jittering that reduces EMI filter cost
• Heat sink connected to SOURCE for low EMI
• Improved auto-restart that delivers <3% of maximum power in short circuit and open loop fault conditions
• Accurate hysteretic thermal shutdown function that automatically recovers without requiring a reset
• Fully integrated soft-start for minimum start-up stress
• Extended creepage between DRAIN and all other pins for improved field reliability

Application Scenarios

The TOP256 model can be used in various applications, including:

• AC/DC converters
• Offline switchers
• Adapters
• Monitors

Comparison

- Lower system cost

- Higher design flexibility

- Multi-mode operation for maximum efficiency

- Extended package creepage distance for improved safety

- Output overvoltage protection (OVP) for user programmable shutdown

- Accurate and programmable current limit

- Optimized line feed-forward for better line ripple rejection

- Reduced transformer and power supply size with 132 kHz frequency

- Low EMI with heat sink connected to SOURCE

- Improved auto-restart and thermal shutdown functions

- Fully integrated soft-start for minimum start-up stress

- Extended creepage for improved reliability

- None mentioned