TI TPS2552精密电源分配方案
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TI 公司的TPS2552/53和TPS2552-1/53-1是电源分配开关,主要用于需要精密限流或大容性负载与可能出现短路的地方.器件通过外接电阻可编程限流阈值在75mA和1.3A之间.限流精度在1.3A时为+/-6%.2us快速过流响应时间,高边MOSFET的导通电阻为85毫欧姆.内置了软起动,工作电压为2.5V到6.5V,待机电流小于1uA,可用于数字电视(DTV(,机顶盒(STB),手机和网络电话(VoIP).本文介绍了TPS2552/53和TPS2552-1/53-1的主要特性与优势, 功能方框图以及评估板的电路图和所用元件列表.
The TPS2552/53 and TPS2552-1/53-1 power-distribution switches are intended for applications where precision current limiting is required or heavy capacitive loads and short circuits are encountered. These devices offer a programmable current-limit threshold between 75 mA and 1.3 A (typ) via an external resistor. Current-limit accuracy as tight as +/-6% can be achieved at the higher current-limit settings. The power-switch rise and fall times are controlled to minimize current surges during turn on/off.
TPS2552/53 devices limit the output current to a safe level by switching into a constant-current mode when the output load exceeds the current-limit threshold. TPS2552-1/53-1 devices provide circuit breaker functionality by latching off the power switch during overcurrent or reverse-voltage situations. An internal reverse-voltage detection comparator disables the power-switch in the event that the output voltage is driven higher than the input to protect devices on the input side of the switch. The FAULT logic output asserts low during overcurrent and reverse-voltage conditions.
TPS2552/53主要特性:
±6% Current-Limit Accuracy at 1.3 A
Meets USB Current-Limiting Requirements
Backwards Compatible with TPS2550/51
Adjustable Current Limit, 75 mA—1300 mA (typ)
Constant-Current (TPS2552/53) and Latch-off (TPS2552-1/53-1) Versions
Fast Overcurrent Response - 2-µS (typ)
85-mΩ High-SideMOSFET (DBV Package)
Reverse Input-Output Voltage Protection
Operating Range: 2.5 V to 6.5 V
1-µA Maximum Standby Supply Current
Built-in Soft-Start
15 kV ESD Protection per IEC 61000-4-2 (with External Capacitance)
TPS2552/53主要优势:
+/-6 percent current-limit accuracy at 1.3 A
Meets USB current-limiting requirements
Adjustable current limit from 75 mA to 1,300 mA
Constant current (TPS2552/3) and latch-off (TPS2552-1/3-1) versions
Compatible with TPS2550/1
Wide, 2.5-V to 6.5-V input range
Fast 2-uS over-current response
-40 degree C to 85 degree C operating temperature range
TPS2552/53应用:
USB Ports/Hubs
Digital TV
Set-Top Boxes
Mobile Phones
VOIP Phones
图1.TPS2552/53功能方框图
TPS2552/53评估板
The TPS2552/3DBVEVM and TPS2552/3DRVEVM are evaluation modules (EVM) for Texas Instruments’ family of power-distribution switches with adjustable current-limit. These EVMs operate over a 2.5-V to 6.5-V range. An onboard jumper sets the output current-limit to either 0.5 A or 1 A. Test points provide convenient access to all critical node voltages.
The silkscreen outline on the PCB top-side encloses components found in a typical USB application. The PCB top-side accepts a power-distribution switch in a SOT23-6 package; the PCB bottom side accepts a power-distribution switch in the smaller SON package with a thermal pad. These switches have an enable input, an overcurrent status output, and overtemperature shutdown.
图2.TPS2552/53评估板电路图
评估板材料列表:
本文关键字：电源 精密 电工文摘，电工技术 - 电工文摘
