topswitch-jx系列產品亮點:

ecosmart  energy effi cient

• ideal for applications from 10 w to 245 w

• energy efficient over entire load range

• no-load consumption below 100 mw at 265 vac

51電子網公益庫存:

G2000SB

G24102SK

G2R-1A4-110V

G690L438T72

G7001

G7201DG

G824H18

G914/G141

GC7129BD

GD74LS257A

• 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 effi ciency at all loads

• 132 khz operation reduces transformer and power supply size

• 66 khz option for highest effi ciency requirements

• accurate programmable current limit

• optimized line feed-forward for line ripple rejection

• frequency jittering reduces emi fi lter cost

• fully integrated soft-start for minimum start-up stress

• 725 v rated mosfet

• simplifi es 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:

• 43 w / 117 w universal input power output capability with

pcb / metal heat sink

• low profi le 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:

• 177 w universal input output power capability

• vertical orientation for minimum pcb footprint

• simple heat sink mounting using clip provides thermal

impedance equivalent to a to-220

• esop™-12 package:

• 66 w universal input output power capability

• low profi le surface mounted for ultra-slim designs

• heat transfer to pcb via exposed pad and source pins

• supports wave or refl ow soldering

• extended creepage to drain pin

• heat sink is connected to source for low emi

topswitch-jx系列典型應用:

• notebook or laptop adapter

• generic adapter

• printer

• lcd monitor

• set-top box

• pc or lcd tv standby

• audio amplifi er

圖1.topswitch-jx系列方框圖

圖2.topswitch-jx系列通用輸入19v 65w反激電源電路圖

圖3.topswitch-jx系列通用輸入12v 30w反激電源電路圖

12v/24v 100w反激電源評估板

this document is an engineering report describing a 12 v / 24 v, 100 w flyback dc-dc converter utilizing a top270vg from the topswitch-jx family of ics. this power supply is intended for use in an lcd tv with led back light. the board requires +380 vdc input, supplied from the pfc stage in a typical tv design.

100w反激電源評估板主要特性:

 highly energy efficient

 full load efficiency >90%

 efficiency >89% above 10% load

 average efficiency >90% (25%, 50%, 75%, 100% load points)

 simplifies meeting energy star 2.0 and eup requirements

 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 edip™-12 package for ultra-slim designs

 integrated protection and reliability features

 line under voltage lock out (uvlo)

 primary sensed output overvoltage shutdown (ovp). latched ovp condition can be reset with a fast ac reset circuit.

 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

圖4.100w反激電源評估板外形圖
100w反激電源主要指標:


圖5.100w反激電源評估板電路圖
100w反激電源評估板材料清單(bom):




圖6.100w反激電源評估板pcb布局圖(頂層)

圖7.100w反激電源評估板pcb布局圖(底層)

圖8.變壓器電路圖
powerint公司的topswitch-jx系列產品集成了725v功率mosfet,高壓開關電流源,多模式pwm控制器,振蕩器,熱關斷電路,故障保護和其它控制電路,適合用于10w-245w的電源.265vac時無負載的功耗小于100mw,主要用在筆記本電腦適配器,打印機,lcd監視器,stb,pc或lcd tv待機電源,音頻放大器.本文介紹了topswitch-jx系列產品亮點,方框圖, 19v 65w反激電源電路圖和12v 30w反激電源電路圖以及12v/24v 100w反激電源評估板主要特性和指標,電路圖,變壓器電路圖與材料清單,pcb布局圖.