</a>放大器" title="放大器">放大器" title="放大器">放大器.本文介绍了TOPSwitch-JX系列产品亮点,方框图, 19V 65W反激电源电路图和12V 30W反激电源电路图以及12V/24V 100W反激电源评估板主要特性和指标,电路图,变压器电路图与材料清单,PCB布局图.

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.

TOPSwitch-JX系列产品亮点:

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

• 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系列典型应用:

• Notebook or laptop adapter

• Generic adapter

• Printer

• LCD monitor

• Set-top box

• PC or LCD TV standby

• Audio amplifi er

图1.TOPSwitch-JX系列方框图

图2.TOPSwitch-JX系列通用输入19V 65W反激电源电路图

图3.TOPSwitch-JX系列通用输入12V 30W反激电源电路图

12V/24V 100W反激电源评估板

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反激电源评估板主要特性:

 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

图4.100W反激电源评估板外形图
100W反激电源主要指标:


图5.100W反激电源评估板电路图
100W反激电源评估板材料清单(BOM):




图6.100W反激电源评估板PCB布局图(顶层)

图7.100W反激电源评估板PCB布局图(底层)

图8.变压器电路图
详情请见:
http://www.powerint.com/sites/default/files/product-docs/topjx_family_datasheet.pdf
和
http://www.powerint.com/sites/default/files/PDFFiles/der299.pdf