參數(shù)資料
型號(hào)： TPS6223-1.5DRYT
廠商： TEXAS INSTRUMENTS INC
元件分類(lèi)： 穩(wěn)壓器
英文描述： 1.22 A SWITCHING REGULATOR, 3800 kHz SWITCHING FREQ-MAX, PDSO6
封裝： 1 X 1.50 MM, 0.60 MM HEIGHT, PLASTIC, MO-287UFAD, SON-6
文件頁(yè)數(shù)： 11/28頁(yè)
文件大?。?/td> 1276K
代理商： TPS6223-1.5DRYT
www.ti.com....................................................................................................................................................... SLVS941A – APRIL 2009 – REVISED AUGUST 2009
SOFT START
The TPS6223X has an internal soft-start circuit that controls the ramp up of the output voltage and limits the
inrush current during start-up. This limits input voltage drops when a battery or a high-impedance power source
is connected to the input of the converter.
The soft-start system generates a monotonic ramp up of the output voltage and reaches the nominal output
voltage typically 100
μs after EN pin was pulled high.
Should the output voltage not have reached its target value by this time, such as in the case of heavy load, the
converter then operates in a current limit mode set by its switch current limits.
TPS6223X is able to start into a pre-biased output capacitor. The converter starts with the applied bias voltage
and ramps the output voltage to its nominal value.
ENABLE / SHUTDOWN
The device starts operation when EN is set high and starts up with the soft start as previously described. For
proper operation, the EN pin must be terminated and must not be left floating.
Pulling the EN pin low forces the device into shutdown, with a shutdown quiescent current of typically 0.1
μA. In
this mode, the P and N-channel MOSFETs are turned off, the internal resistor feedback divider is disconnected,
and the entire internal-control circuitry is switched off.
The EN input can be used to control power sequencing in a system with various DC/DC converters. The EN pin
can be connected to the output of another converter, to drive the EN pin high and getting a sequencing of supply
rails.
SHORT-CIRCUIT PROTECTION
The TPS6223X integrates a High Side and Low Side MOSFET current limit to protect the device against heavy
load or short circuit. The current in the switches is monitored by current limit comparators. When the current in
the P-channel MOSFET reaches its current limit, the P-channel MOSFET is turned off and the N-channel
MOSFET is turned on to ramp down the current in the inductor. The High Side MOSFET switch can only turn on
again, once the current in the Low Side MOSFET switch has decreased below the threshold of its current limit
comparator.
THERMAL SHUTDOWN
As soon as the junction temperature, TJ, exceeds 150°C (typical) the device goes into thermal shutdown. In this
mode, the High Side and Low Side MOSFETs are turned-off. The device continues its operation when the
junction temperature falls below the thermal shutdown hysteresis.
Copyright 2009, Texas Instruments Incorporated
19
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TPS622316DRYR 功能描述:直流/直流開(kāi)關(guān)轉(zhuǎn)換器 3MHz Ultra Small Step Down Converter RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT
TPS622316DRYT 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3MHz Ultra Small Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS622317DRYR 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3MHz Ultra Small Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
TPS622317DRYT 功能描述:直流/直流開(kāi)關(guān)調(diào)節(jié)器 3MHz Ultra Small Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開(kāi)關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
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