基于TOP266EG的27W LCD監視器電源設計方案
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Power Supply Using TOP266EG
90 VACC265 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產品亮點：
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
圖１．TOP266EG 功能方框圖(E和V封裝)
圖２．采用TOP266EG的65W 19V通用輸入反激電源電路圖
圖３．采用TOP266EG的30W 12V通用輸入反激電源電路圖
27W LCD監視器電源設計方案
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.
圖４．27W LCD監視器電源參考設計外形圖
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