參數(shù)資料
型號： TPS2051BD
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, MS-012AA, SOIC-8
文件頁數(shù)： 21/51頁
文件大小： 1451K
代理商： TPS2051BD
SLVS514K – JUNE 2010 – REVISED DECEMBER 2008
www.ti.com
Enable (ENx)
The logic enable disables the power switch and the bias for the charge pump, driver, and other circuitry to reduce
the supply current. The supply current is reduced to less than 1 mA or 2 mA when a logic low is present on ENx.
A logic high input on ENx restores bias to the drive and control circuits and turns the switch on. The enable input
is compatible with both TTL and CMOS logic levels.
Overcurrent (OCx)
The OCx open-drain output is asserted (active low) when an overcurrent or overtemperature condition is
encountered. The output remains asserted until the overcurrent or overtemperature condition is removed. A
10-ms deglitch circuit prevents the OCx signal from oscillation or false triggering. If an overtemperature shutdown
occurs, the OCx is asserted instantaneously.
Current Sense
A sense FET monitors the current supplied to the load. The sense FET measures current more efficiently than
conventional resistance methods. When an overload or short circuit is encountered, the current-sense circuitry
sends a control signal to the driver. The driver in turn reduces the gate voltage and drives the power FET into its
saturation region, which switches the output into a constant-current mode and holds the current constant while
varying the voltage on the load.
Thermal Sense
The TPS204xB/TPS205xB implements a thermal sensing to monitor the operating temperature of the power
distribution switch. In an overcurrent or short-circuit condition, the junction temperature rises. When the die
temperature rises to approximately 140°C due to overcurrent conditions, the internal thermal sense circuitry turns
off the switch, thus preventing the device from damage. Hysteresis is built into the thermal sense, and after the
device has cooled approximately 10 degrees, the switch turns back on. The switch continues to cycle off and on
until the fault is removed. The open-drain false reporting output (OCx) is asserted (active low) when an
overtemperature shutdown or overcurrent occurs.
Undervoltage Lockout
A voltage sense circuit monitors the input voltage. When the input voltage is below approximately 2 V, a control
signal turns off the power switch.
28
Copyright 2010–2008, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS2051BD 制造商:Texas Instruments 功能描述:IC PWR DIST SWITCH SNGL 8-SOIC 制造商:Texas Instruments 功能描述:IC, PWR DIST SWITCH SNGL 8-SOIC 制造商:Texas Instruments 功能描述:IC, PWR DIST SWITCH SNGL 8-SOIC; Primary Input Voltage:5.5V; Output Current:500mA; Voltage Regulator Case Style:SOIC; No. of Pins:8; Operating Temperature Min:-40C; Operating Temperature Max:85C; SVHC:No SVHC (19-Dec-2012); Base ;RoHS Compliant: Yes
TPS2051BD 制造商:Texas Instruments 功能描述:POWER DISTRIBUTION SWITCH IC ((NW))
TPS2051BDBV 制造商:TI 制造商全稱:Texas Instruments 功能描述:CURRENT-LIMITED, POWER-DISTRIBUTION SWITCHES
TPS2051BDBVR 功能描述:電源開關(guān) IC - USB Sngl Current Ltd Pwr Dstrbtn Sw RoHS:否 制造商:Micrel 電源電壓-最小:2.7 V 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:SOIC-8 封裝:Tube
TPS2051BDBVR 制造商:Texas Instruments 功能描述:SWITCH CURRENT LTD 1A 5SOT2 制造商:Texas Instruments 功能描述:POWER DISTRIBUTION LOAD SWITCH IC (NW)
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