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基于TOP265EG设计的30W待机电源方案

• TOPSwitch-JX系列(TOP264-271)集成了725V功率MOSFET,高压开关电流源,多模式PWM控制,热关断电路,故障保护和其它控制电路, 265 VAC电压下无负载的功耗低于100mW.本文介绍了TOPSwitch-JX系列(TOP264-271)主要特性, 方框图, 通用输入高效19V 65W反激电源电路图和采用TOP265EG的12V 30W高效待机电源设计案例的电路图和所用材料清单.
  
  TOPSwitch-JX TOP264-271 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.
  
  TOPSwitch-JX 系列主要特性:
  
  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 Desig差模电感n 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)
  
  • 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
  
  
  图1.TOPSwitch-JX系列功能方框图(E 和V 封装).
  
  图2.TOPSwitch-JX系列通用输入高效19V 65W反激电源电路图
  
  采用TOPSwitch-JX系列TOP265EG的12V 30W高效待机电源设计案例
  绕行电感
  12V 30W设计案例主要特性:
  
  Highly energy efficient
  
  Full load efficiency >90%
  
  Efficiency >87% above 10% load
  
  Average efficiency >90% (25%, 50%, 75%, 100% load points)
  
  No-load input power <100 mW
  
  Simplifies meeting ENERGY STAR 2.0, 80 Plus and EuP requirements
  
  725 V MOSFET rating allowed high turns ratio (VOR) and use of 60 V Schottky output diode
  
  Low cost, low component count and small PCB footprint solution
  
  Performance met without synchronous output rectification
  
  132 kHz operation optimized core size and efficiency performance
  
  Low-profile eSIP package
  
  Integrate固定电感器价格d Protection and Reliability Features
  
  Line under-voltage lock out (UVLO)
  
  Primary sensed latching output overvoltage shutdown (OVP) with fast AC reset
  
  Auto recovery output over current (OCP)
  
  Meets limited power source (LPS) <100 VA requirement with a single point of failure
  
  Accurate thermal shutdown with large hysteresis
  
  
  图3.设计案例PCB外形图(2.工字电感97 x 2.14 吋).
  
  设计电源指标:
  

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