參數(shù)資料
型號(hào): TPS2557DRBT
廠商: TEXAS INSTRUMENTS INC
元件分類: 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): 6/22頁(yè)
文件大小: 942K
代理商: TPS2557DRBT
OUT
IN
GND
FAULT
ILIM
EN
RILIM
20 k
RFAULT
100 k
Input
TPS2557
0.1 uF
Power Pad
CLOAD
RLOAD
CRETRY
0.22 F
Output
1 k
OUT
IN
GND
FAULT
ILIM
EN
RILIM
20 k
RFAULT
100 k
External Logic
Signal & Driver
TPS2557
0.1 uF
Power Pad
CLOAD
RLOAD
CRETRY
0.22 F
Output
Input
SLVS931 – NOVEMBER 2009
www.ti.com
AUTO-RETRY FUNCTIONALITY
Some applications require that an overcurrent condition disables the part momentarily during a fault condition
and re-enables after a pre-set time. This auto-retry functionality can be implemented with an external resistor and
capacitor. During a fault condition, FAULTpulls low EN. The part is disabled when EN is pulled below the turn-off
theshold, and FAULT goes high impedance allowing CRETRY to begin charging. The part re-enables when the
voltage on EN reaches the turn-on threshold. The auto-retry time is determined by the resistor/capacitor time
constant. The part will continue to cycle in this manner until the fault condition is removed.
Figure 20. Auto-Retry Functionality
Some applications require auto-retry functionality and the ability to enable/disable with an external logic signal.
The figure below shows how an external logic signal can drive EN through RFAULT and maintain auto-retry
functionality. The resistor/capacitor time constant determines the auto-retry time-out period.
Figure 21. Auto-Retry Functionality With External EN Signal
TWO-LEVEL CURRENT-LIMIT CIRCUIT
Some applications require different current-limit thresholds depending on external system conditions. Figure 22
shows an implementation for an externally-controlled, two-level current-limit circuit. The current-limit threshold is
set by the total resistance from ILIM to GND (see previously discussed "Programming the Current-Limit
Threshold" section). A logic-level input enables/disables MOSFET Q1 and changes the current-limit threshold by
modifying the total resistance from ILIM to GND. Additional MOSFET/resistor combinations can be used in
parallel to Q1/R2 to increase the number of additional current-limit levels.
NOTE
ILIM should never be driven directly with an external signal.
14
Copyright 2009, Texas Instruments Incorporated
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:汽車級(jí),AEC-Q100 包裝:剪切帶(CT) 零件狀態(tài):有效 開關(guān)類型:通用 輸出數(shù):1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類型:N 通道 接口:開/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 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 開關(guān)類型:通用 輸出數(shù):1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類型:N 通道 接口:開/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 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 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,配電開關(guān)(負(fù)載開關(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:汽車級(jí),AEC-Q100 包裝:剪切帶(CT) 零件狀態(tài):有效 開關(guān)類型:通用 輸出數(shù):1 比率 - 輸入:輸出:1:1 輸出配置:高端 輸出類型:N 通道 接口:開/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 供應(yīng)商器件封裝:10-VSON(3x3) 標(biāo)準(zhǔn)包裝:1