27W LCD monitor power supply design based on TOP266EG

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

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 highest efficiency requirements

• Accurate programmable current limit

• Optimized line feed-forward for line ripple rejection

• 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

• eDIP™-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

Figure 1. TOP266EG functional block diagram (E and V packages )

Figure 2. 65W 19V universal input flyback power supply circuit using TOP266EG Figure

Figure 3. 30W 12V universal input flyback power supply circuit diagram using TOP266EG

27W LCD Monitor Power Supply Design Solution

This document is an engineering report describing a 5 V / 2.5 A, 14.5 V / 1 A power supply utilizing a TOP266EG. The TOP266EG is part of the TOPSwitch-JX IC family from Power Integrations. The document contains the power supply specification, schematic, bill of materials, transformer documentation, printed circuit layout, and performance data.