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PowerInt TFS762HG RDR249 300W电源设计方案

文章出处:8gled.com作者:格烁光电发表时间:2018-07-23
山东代孕-胎儿频道2bjq【好孕真的好】PowerInt 公司的TFS762HG是HiperTFS系列成员,集成了两个大功率双开关正向转换器和中功率反激(副)转换器,所提供的主功率高达414W,副转换器提供高达20W功率.器件具有可编程的火线欠压(UV)检测,过压(OV)检测以及精确的延迟热关断(OTP)等保护,满负荷效率大于90%,主要应用在PC,打印机,LCD TV,视频游戏机,大功率适配器以及工业和电器大功率适配器.本文介绍了TFS762HG产品特性和亮点, 方框图, 主输出12V/25A,待机电源5V/2.5A的电路图以及采用TFS762HG的14.5 W待机和300 W主电源参考设计电路图,材料清单和主副电源变压器电路图.

The HiperTFS device family members incorporate both a high-power two-switch-forward converter and a mid-power flyback (standby) converter into a single, low-profile eSIP™ power package. The single chip solution provides the controllers for the two-switch-forward and flyback converters, high- and low-side drivers, all three of the high-voltage power MOSFETs, and ELiminates the converter’s 福建代孕-【好孕永留传ci7w】健康频道need for costly external pulse transformers. The device is ideal for high power applications that require both a main power converter (two-switch forward) up to 414 W, and standby converter (flyback) up to 20 W. HiperTFS includes Power Integrations’ standard set of comprehen- sive protection features, such as integrated soft-start, fault and over-load protection, and hysteretic thermal shutdown. HiperTFS utilizes advanced power packaging technology that simplifies the complexity of two-switch forward layout, mounting and thermal management, while providing very high power capabilities in a single compact package. The devices operate over a wide input voltage range, and can be used following a power-factor correction stage such as HiperPFS.

Two-switch-forward power converters are often selected for applications demanding cost-effective efficiency, fast transient response, and accurate tolerance to line voltage fluctuation. The two-switch-forward controller incorporated into HiperTFS devices improves on the classic topology by allowing operation considerably above 60% duty cycle. This improvement reduces RMS currents conduction losses, minimizes the size and cost of the bulk capacitor, and minimizes output diode voltage ratings. The advanced design also includes transformer flux reset control (saturation protection) and charge-recovery switching of the high-side MOSFET, which reduces switching losses. This combination of innovations yields an extremely efficient power supply with smaller MOSFETs, fewer passives and discrete components, and a lower-cost transformer.

HiperTFS’s flyback standby controller and MOSFET solution is based on the highly popular TinySwitch™ technology used in billions of power converter ICs due to its simplicity of operation, light load efficiency, and rugged, reliable, performance. This flyback converter can provide up to 20 W of output power and the built in overload power compensation reduces component design margin.

TFS762HG产品亮点:

Protected Two-Switch Forward and Flyback Combination Solution

Incorporates three high-voltage power MOSFETs, main and standby controllers, and gate drivers

Level shift technology eliminates need for pulse transformer

Programmable line undervoltage (UV) detection prevents turn-off glitches

Programmable line overvoltage (OV) detection; latching and non-latching

Accurate hysteretic thermal shutdown (OTP)

Accurate selectable current limit (main and standby)

Output over-current protection (OCP)

Fully integrated soft-start for minimum start-up stress

Simple fast AC reset

Reduced EMI

Synchronized 66 kHz forward and 132 kHz flyback converters

Frequency jitter

Eliminates up to 30 discrete components for higher reliability and lower cost

Asymmetrical Two-Switch Forward Reduces Losses

Allows >50% duty cycle operation

Reduces primary side RMS currents and conduction losses

Minimizes the size and cost of the bulk capacitor

Allows reduced capacitance or longer hold-up time

Allows lower voltage output diodes

Transformer reset control

Prevents transformer saturation under all conditions

Extends duty cycle to satisfy AC cycle drop out ride through

Duty cycle soft-start with 115% current limit boost

Satisfies 2 ms ~ 20 ms start-up with large capacitance at output

Output short circuit protection (SCP) with auto-restart

Remote ON/OFF function

Voltage mode controller with current limit

20 W Flyback with Selectable Power Limit

TinySwitch-III based converter

Selectable power limit (10 W, 12.5 W, 15 W, or 20 W)

Built-in overload power compensation

Flat overload power vs. input voltage

Reduces component stress during overload conditions

Reduces required design margin for transformer and output diode

Output overvoltage (OV) protection with fast AC reset

Latching, non-latching, or auto-restart

Auto-restart

Advanced Package for High Power Applications

434 W output power capability in a highly compact package

Up to 550 W peak

Simple clip mounting to heat sink

Can be directly connected to heat sink without insulation pad

Provides thermal impedance equivalent to a TO-220

Heat slug connected to ground potential for low EMI

Staggered pin arrangement for simple routing of board traces and high-voltage creepage requirements

Single power package for two power converters reduces assembly costs layout size

TFS762HG主要优势:

Single chip solution for two-switch forward main and flyback standby

High integration allows smaller form factor and higher power density designs

Incorporates control, gate drivers, and three power MOSFETS

Level shift technology eliminates need for pulse transformer

Protection features include: UV, OV, OTP, OCP, and SCP

Transformer reset control

Prevents transformer saturation under all conditions

Allows >50% duty cycle operation

Reduces primary side RMS currents and conduction losses

Standby supply provides built-in overload power compensation

Up to 434 W total output power in a highly compact package

Up to 550 W peak

High efficiency solution easily enables design to meet stringent efficiency specifications

>90% efficiency at full load

No-load regulation and low losses at light-load

Simple clip mounting to heat sink without need for insulation pad

Halogen free and RoHS compliant

TFS762HG应用:

PC

Printer

LCD TV

Video game consoles

High-power adapters

Industrial and appliance high-power adapters


图1.TFS762HG两开关正向转换器方框图

图2.TFS762HG两开关正向和反激(副)转换器简化电路图

图3.TFS762HG高效电路图:主输出12V/25A, 副电源5V/2.5A

采用TFS762HG的14.5 W副和300 W主电源参考设计

参考设计主要特性:

High efficiency Main and Standby converters

Remote on/off

Built-in main and standby undervoltage thresholds protection ensures graceful

power supply start-up and shutdown

Latching output overvoltage protection

Integrated high-side driver

Output short-circuit and open loop protection

Main transformer reset protection

Flat standby overload versus input voltage

This document is an engineering report describing a 5 V, 2.9 A Standby and a 12 V, 25 A Main power supply utilizing the TFS762HG device from the HiperTFS family.

This example power supply uses a fixed DC input voltage, but in a typical application, it would be connected to a PFC boost input stage, delivering approximately 385 VDC to implement a 300 W power supply with various output voltages. A lab bench DC power supply capable of 400 VDC at 3 A or an AC input rectifier stage is required supply to the input for evaluation. It is also possible to use the power factor circuit RDK-236 to provide the regulated 385 VDC needed to power RDK-249.

Typically PC power supplies have a universal AC input power factor corrected (PFC) input stage but as the bias standby supply must operate before the PFC stage is active,the Standby output must operate with the DC equivalent of universal AC input voltages(85 VAC to 265 VAC and 100 VDC to 400 VDC).


图4.采用TFS762HG的电源外形图
采用TFS762HG的电源指标:



图5.采用TFS762HG的参考设计电源电路图

采用TFS762HG的参考设计电源材料清单(BOM):



Standby Transformer Specification

图6. 副电源变压电路图
Main Transformer Specification

图7.主电源变压电路图

山东代孕-胎儿频道2bjq【好孕真的好】 PowerInt TFS762HG RDR249 300W电源设计方案原创编辑请注明出来http://m.hzjjn.com

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