參數(shù)資料
型號(hào)： TPS2557DRBT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
封裝： GREEN, PLASTIC, SON-8
文件頁(yè)數(shù)： 22/22頁(yè)
文件大?。?/td> 942K
代理商： TPS2557DRBT
0
VIN-VOUT-mV
0
20
60
100
140
IDS-StaticDrain-SourceCurrent-
A
3.0
0.5
1.0
1.5
2.0
2.5
T =125°C
J
T =-40°C
J
T =25°C
J
160
R
=24.9k
ILIM
40
80
120
5.0
4.5
4.0
3.5
www.ti.com
SLVS931 – NOVEMBER 2009
TYPICAL CHARACTERISTICS (continued)
Figure 18. Switch Current vs. Drain-Source Voltage Across Switch
DETAILED DESCRIPTION
OVERVIEW
The TPS2556/57 is a current-limited, power-distribution switch using N-channel MOSFETs for applications where
short circuits or heavy capacitive loads will be encountered. This device allows the user to program the
current-limit threshold between 500 mA and 5.0 A (typ) via an external resistor. This device incorporates an
internal charge pump and the gate drive circuitry necessary to drive the N-channel MOSFET. The charge pump
supplies power to the driver circuit and provides the necessary voltage to pull the gate of the MOSFET above the
source. The charge pump operates from input voltages as low as 2.5 V and requires little supply current. The
driver controls the gate voltage of the power switch. The driver incorporates circuitry that controls the rise and fall
times of the output voltage to limit large current and voltage surges and provides built-in soft-start functionality.
The TPS2556/57 family limits the output current to the programmed current-limit threshold IOS during an
overcurrent or short-circuit event by reducing the charge pump voltage driving the N-channel MOSFET and
operating it in the linear range of operation. The result of limiting the output current to IOS reduces the output
voltage at OUT because N-channel MOSFET is no longer fully enhanced.
OVERCURRENT CONDITIONS
The TPS2556/57 responds to overcurrent conditions by limiting their output current to IOS . When an overcurrent
condition is detected, the device maintains a constant output current and the output voltage reduces accordingly.
Two possible overload conditions can occur.
The first condition is when a short circuit or partial short circuit is present when the device is powered-up or
enabled. The output voltage is held near zero potential with respect to ground and the TPS2556/57 ramps the
output current to IOS. The TPS2556/57 will limit the current to IOS until the overload condition is removed or the
device begins to thermal cycle.
The second condition is when a short circuit, partial short circuit, or transient overload occurs while the device is
enabled and powered on. The device responds to the overcurrent condition within time tIOS (see Figure 3). The
current-sense amplifier is overdriven during this time and momentarily disables the internal N-channel MOSFET.
The current-sense amplifier recovers and ramps the output current to IOS. Similar to the previous case, the
TPS2556/57 will limit the current to IOS until the overload condition is removed or the device begins to thermal
cycle.
The TPS2556/57 thermal cycles if an overload condition is present long enough to activate thermal limiting in any
of the above cases. The device turns off when the junction temperature exceeds 135°C (min) while in current
limit. The device remains off until the junction temperature cools 20°C (typ) and then restarts. The TPS2556/57
cycles on/off until the overload is removed (see Figure 10) .
Copyright 2009, Texas Instruments Incorporated
9
Product Folder Link(s): TPS2556 TPS2557
相關(guān)PDF資料
PDF描述
TPS2557DRB 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
TPS2561DRC 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
TPS2561DRCT 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO10
TPS3305-20QDRQ1 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
TPS3305-18QDRQ1 2-CHANNEL POWER SUPPLY MANAGEMENT CKT, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2557QDRBRQ1 功能描述:IC PWR DIST SWITCH ADJ 8SON 制造商:texas instruments 系列:汽車(chē)級(jí)，AEC-Q100 包裝:剪切帶（CT） 零件狀態(tài):有效 開(kāi)關(guān)類(lèi)型:通用 輸出數(shù):1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類(lèi)型:N 通道 接口:開(kāi)/關(guān) 電壓 - 負(fù)載:2.5 V ~ 6.5 V 電壓 - 電源（Vcc/Vdd）:不需要 電流 - 輸出（最大值）:5A 導(dǎo)通電阻（典型值）:22 毫歐 輸入類(lèi)型:非反相 特性:壓擺率受控型，狀態(tài)標(biāo)志 故障保護(hù):限流（可調(diào)），超溫，UVLO 工作溫度:-40°C ~ 125°C （TJ） 封裝/外殼:8-VDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:8-SON（3x3） 標(biāo)準(zhǔn)包裝:1
TPS2559DRCR 功能描述:IC PWR DIST SWITCH ADJ 10VSON 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):有效 開(kāi)關(guān)類(lèi)型:通用 輸出數(shù):1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類(lèi)型:N 通道 接口:開(kāi)/關(guān) 電壓 - 負(fù)載:2.5 V ~ 6.5 V 電壓 - 電源（Vcc/Vdd）:不需要 電流 - 輸出（最大值）:5.5A 導(dǎo)通電阻（典型值）:13 毫歐 輸入類(lèi)型:非反相 特性:壓擺率受控型，狀態(tài)標(biāo)志 故障保護(hù):限流（可調(diào)），超溫，UVLO 工作溫度:-40°C ~ 125°C （TJ） 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:10-VSON（3x3） 標(biāo)準(zhǔn)包裝:1
TPS2559DRCT 功能描述:IC PWR DIST SWITCH ADJ 10VSON 制造商:texas instruments 系列:* 包裝:剪切帶（CT） 零件狀態(tài):在售 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:10-VSON（3x3） 標(biāo)準(zhǔn)包裝:1
TPS2559EVM-624 功能描述:EVAL MODULE FOR TPS2559 制造商:texas instruments 系列:- 零件狀態(tài):在售 主要用途:電源管理，配電開(kāi)關(guān)（負(fù)載開(kāi)關(guān)） 嵌入式:- 使用的 IC/零件:TPS2559 主要屬性:- 輔助屬性:- 所含物品:板 標(biāo)準(zhǔn)包裝:1
TPS2559QWDRCRQ1 功能描述:IC DISTRIBUTION SWITCH 10VSON 制造商:texas instruments 系列:汽車(chē)級(jí)，AEC-Q100 包裝:剪切帶（CT） 零件狀態(tài):有效 開(kāi)關(guān)類(lèi)型:通用 輸出數(shù):1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類(lèi)型:N 通道 接口:開(kāi)/關(guān) 電壓 - 負(fù)載:2.5 V ~ 6.5 V 電壓 - 電源（Vcc/Vdd）:不需要 電流 - 輸出（最大值）:5.5A 導(dǎo)通電阻（典型值）:13 毫歐 輸入類(lèi)型:非反相 特性:壓擺率受控型，狀態(tài)標(biāo)志 故障保護(hù):限流（可調(diào)），超溫，反向電流，UVLO 工作溫度:-40°C ~ 125°C （TJ） 封裝/外殼:10-VFDFN 裸露焊盤(pán) 供應(yīng)商器件封裝:10-VSON（3x3） 標(biāo)準(zhǔn)包裝:1
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