27W LCD monitor power supply design based on TOP266EG - Power Circuit - Circuit Diagram

The TOPSwitch-JX Series TOP266EG is a cost-effective device that integrates a 725V power MOSFET, high voltage switch current source, multimode PWM control, oscillator, thermal shutdown circuitry, fault protection and other control circuitry. At 265 VAC, the no-load power consumption is less than 100 mW and the operating frequency is 132 kHz, which reduces the size of the transformer and the size of the power supply. This article introduces the main features of the TOPSwitch-JX series, product highlights, functional block diagrams, and 65W 19V and 30W 12V general-purpose input flyback power supply circuit diagrams, 27W LCD monitor power supply reference design main indicators, circuit diagrams and bill of materials (BOM).

Power Supply Using TOP266EG

90 VAC–265 VAC Input; 5V, 2.5A and 14.5V, 1A Outputs

Application LCD Monitor

TOPSwitch-JX cost effectively incorporates a 725 V power MOSFET, high voltage switched current source, multi-mode PWM control, oscillator, thermal shutdown circuit, fault protection and other control circuitry onto a monolithic device.

TOP266EG product highlights:

• EcoSmart® - Energy Efficient

• Energy efficient over entire load range

• No-load consumption below 100 mW at 265 VAC

• Up to 750 mW standby output power for 1 W input at 230 VAC High Design Flexibility for Low System Cost

• Multi-mode PWM control maximizes efficiency at all loads

• 132 kHz operation reduces transformer and power supply size

• 66 kHz option for the highest efficiency requirements

• Accurate programmable current limit

• Optimized line feed-forward for line

• Frequency jittering reduces EMI filter cost

Fully integrated soft-start for minimum startup stress

• 725 V rated MOSFET

• Simplifies meeting design derating requirements Extensive Protection Features

• Auto-restart limits power delivery to <3% during overload faults

• Output short-circuit protection (SCP)

• Output over-current protection (OCP)

• Output overload protection (OPP)

• Output overvoltage protection (OVP)

• User programmable for hysteretic/latching shutdown

• Simple fast AC reset

• Primary or secondary sensed

• Line undervoltage (UV) detection prevents turn-off glitches

• Line overvoltage (OV) shutdown extends line surge withstand

• Accurate thermal shutdown with large hysteresis (OTP) Advanced Package Options

• eDIPTM-12 package:

• Low profile horizontal orientation for ultra-slim designs

• Heat transfer to both PCB and heat sink

• Optional external heat sink provides thermal impedance equivalent to a TO-220

• eSIP®-7C package:

• Vertical orientation for minimum PCB footprint

• Simple heat sink mounting using clip provides thermal impedance equivalent to a TO-220

• Extended creepage to DRAIN pin

• Heat sink is connected to SOURCE for low EMI