基于TOP265EG设计的30W待机电源方案

2011-10-26 15:13:03来源: 互联网
equirements

• 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

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

Integrated 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(2.97 x 2.14 吋).

设计电源指标:


图4. 12V 30W设计案例电路图

设计案例材料清单:


图5. 12V 30W设计案例变压器电框图

关键字:TOP265EG  电源

编辑:神话 引用地址:http://www.eeworld.com.cn/mndz/2011/1026/article_12588.html
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