TI 公司的TPS24720 是容易使用全特性保護的2.5V-18V熱插拔控制器.器件驅動外接N溝MOSFET,起動時能精確地限流,可編程FET SOA保護,可調整電流檢測閾值,短路時具有快速中斷保護,工作電壓2.5V到18V,主要用在服務器背板,存儲區域網(SAN),通信子板,醫療系統,插入模塊和基站.本文介紹了TPS24720主要特性, 方框圖,10A時12V的典型應用電路圖以及評估模塊TPS24720EVM-001主要特性,電路圖和材料清單與PCB布局圖.

The TPS24720 is an easy-to-use, full-featured protection device for 2.5-V to 18-V power rails. This hot-swap controller drives an external N-channel MOSFET, while protecting source, load and external MOSFET against multiple potentially damaging events. During startup, load current and MOSFET power dissipation are limited to user-selected values. After startup, currents above the user-selected limit will be allowed to flow until programmed timeout – except in extreme overload events when load is immediately disconnected from source.

Programmable power limiting ensures the external MOSFET operates inside its safe operating area (SOA) at all times. This allows use of smaller FETs while improving system reliability.

TPS24720主要特性:

2.5-V to 18-V Operation

Accurate Current Limiting for Startup

Programmable FET SOA Protection

Adjustable Current Sense Threshold

Programmable Fault Timer

Power-Good Output

Fast Breaker for Short-Circuit Protection

Analog Load-Current Monitor Output

Programmable UV and OV

Low-current Standby Mode

FET Fault Detection Flag

3-mm × 3-mm, 16-Pin QFN package

TPS24720應用:

Server Backplanes

Storage Area Networks (SAN)

Telecommunications Mezzanine Cards

Medical Systems

Plug-In Modules

Base Stations


圖1.TPS24720方框圖

圖2.TPS24720典型應用電路圖(12V/10A)

圖3.TPS24720設計案例中簡化方框圖

評估模塊TPS24720EVM-001

The TPS24720EVM-001 is a fully assembled and tested circuit for evaluating the TPS24720 Positive Voltage Power-Limiting Hotswap Controller. The evaluation module is a 12V, 25A hot swap controller operating in latch off or re-try mode with an external MOSFET.

評估模塊TPS24720EVM-001主要特性:

+2.5V to +20V Operation

Programmable Power Limit for FET Protection

Programmable Fault Timer

Load Current Indicator Output

High-side Drive for External NFET

Power Good Output - Open-Drain

UV, OV Inputs

16-pin QFN

評估模塊TPS24720EVM-001應用:

• Server

– Plug-in Circuit Boards

– RAID/Disk Drive

• Telecom

– ATCA

– Micro-ATCA

• General Hot Plug

圖4.評估模塊TPS24720EVM-001電路圖
評估模塊TPS24720EVM-001材料清單(BOM):



圖5.評估模塊TPS24720EVM-001 PCB布局圖(頂層)
詳情請見:
http://focus.ti.com/lit/ds/symlink/tps24720.pdf
和
http://focus.ti.com/lit/ug/sluu458/sluu458.pdf