參數(shù)資料
型號(hào)： TPS2043DG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 電源管理
英文描述： 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： GREEN, PLASTIC, SOIC-16
文件頁(yè)數(shù)： 8/28頁(yè)
文件大?。?/td> 601K
代理商： TPS2043DG4
TPS2043, TPS2053
TRIPLE POWER-DISTRIBUTION SWITCHES
SLVS191 – JANUARY 1999
16
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
power-supply considerations
A 0.01-
F to 0.1-F ceramic bypass capacitor between INx and GND, close to the device, is recommended.
Placing a high-value electrolytic capacitor on the output pin(s) is recommended when the output load is heavy.
This precaution reduces power-supply transients that may cause ringing on the input. Additionally, bypassing
the output with a 0.01-
F to 0.1-F ceramic capacitor improves the immunity of the device to short-circuit
transients.
overcurrent
A sense FET checks for overcurrent conditions. Unlike current-sense resistors, sense FETs do not increase the
series resistance of the current path. When an overcurrent condition is detected, the device maintains a
constant output current and reduces the output voltage accordingly. Complete shutdown occurs only if the fault
is present long enough to activate thermal limiting.
Three possible overload conditions can occur. In the first condition, the output has been shorted before the
device is enabled or before VI(INx) has been applied (see Figure 6). The TPS2043 and TPS2053 sense the short
and immediately switch into a constant-current output.
In the second condition, the excessive load occurs while the device is enabled. At the instant the excessive load
occurs, very high currents may flow for a short time before the current-limit circuit can react. After the
current-limit circuit has tripped (reached the overcurrent trip threshhold) the device switches into
constant-current mode.
In the third condition, the load has been gradually increased beyond the recommended operating current. The
current is permitted to rise until the current-limit threshold is reached or until the thermal limit of the device is
exceeded (see Figure 7). The TPS2043 and TPS2053 are capable of delivering current up to the current-limit
threshold without damaging the device. Once the threshold has been reached, the device switches into its
constant-current mode.
OC response
The OC open-drain output is asserted (active low) when an overcurrent or overtemperature condition is
encountered. The output will remain asserted until the overcurrent or overtemperature condition is removed.
Connecting a heavy capacitive load to an enabled device can cause momentary false overcurrent reporting from
the inrush current flowing through the device, charging the downstream capacitor. An RC filter of 500
s (see
Figure 30) can be connected to the OC pin to reduce false overcurrent reporting. Using low-ESR electrolytic
capacitors on the output lowers the inrush current flow through the device during hot-plug events by providing
a low impedance energy source, thereby reducing erroneous overcurrent reporting.
相關(guān)PDF資料
PDF描述
TPS2053DR 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2053DG4 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2047BD 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2047BDRG4 3-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
TPS2046BDG4 2-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO8
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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TPS2043DRG4 功能描述:電源開關(guān) IC - USB DUAL HI-SIDE MOSFET 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
TPS2044 制造商:TI 制造商全稱:Texas Instruments 功能描述:POWER DISTRIBUTION SWITCHES
TPS2044A 制造商:未知廠家 制造商全稱:未知廠家 功能描述:0.7A. 2.7-5.5V Quad (2In/4Out) Hi-Side MOSFET. Fault Report. Act-Low Enable
TPS2044AD 功能描述:電源開關(guān) IC - USB Qd .345A 2.7-5.5V Hi 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
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