TOP258MG

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1. Description

TOP258MG cost effectively incorporates a 700 V power MOSFET, high voltage switched current source, PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device.

2. Product Highlights

   1. Multi-mode operation maximizes efficiency at all loads

   2. New eSIP-7F and eSIP-7C packages

   3. Low thermal impedance junction-to-case (2 °C per watt)

   4. Low height is ideal for adapters where space is limited

   5. Simple mounting using a clip to aid low cost manufacturing

   6. Horizontal eSIP-7F package ideal for ultra low height adapter and monitor applications

   7. Extended package creepage distance from DRAIN pin to adjacent pin and to heat sink

   8. 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

   9. Output overvoltage protection (OVP) is user programmable for latching/non-latching shutdown with fast AC reset

  11.  Allows both primary and secondary sensing

  12. Line undervoltage (UV) detection prevents turn-off glitches

  13. Line overvoltage (OV) shutdown extends line surge limit

  14. Accurate programmable current limit

  15. Optimized line feed-forward for line ripple rejection

  16. 132 kHz frequency (254Y-258Y and all E/L packages) reduces transformer and power supply size

  17. Half frequency option for video applications

  18. Frequency jittering reduces EMI filter cost

3. Pin Functional Description

1. DRAIN (D) Pin:

High-voltage power MOSFET DRAIN pin. The internal start-up bias current is drawn from this pin through a switched highvoltage current source. Internal current limit sense point for drain current.

2. CONTROL (C) Pin:

Error amplifier and feedback current input pin for duty cycle control. Internal shunt regulator connection to provide internal bias current during normal operation. It is also used as the connection point for the supply bypass and auto-restart/compensation capacitor.

3. EXTERNAL CURRENT LIMIT (X) Pin (Y, M, E and L package):

Input pin for external current limit adjustment and remote ON/OFF. A connection to SOURCE pin disables all functions on this pin. 

4. Product packaging information