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參數(shù)資料
| 型號(hào)： | TPS40042DRCTG4 |
| 廠(chǎng)商： | TEXAS INSTRUMENTS INC |
| 元件分類(lèi)： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁(yè)數(shù)： | 3/35頁(yè) |
| 文件大小： | 746K |
| 代理商： | TPS40042DRCTG4 |
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Enable and Start-Up Sequence
1.6
6
EN
COMP
V
OUT
T - Time - ms
Configure
ILIM
Threshold
Soft Start
REFIN
SS
V
t
6.0ms
1.5 V
=
÷
è
(2)
SLUS777 – NOVEMBER 2007
The EN pin of the TPS40042 is internally pulled to VDD. When power is applied to VDD, the EN pin is allowed to
float high, and the TPS40042 remains OFF. Only when the EN pin is externally pulled below the threshold
voltage of (VVDD - 1.2 V) is the TPS40042 allowed to start. When enabled, the TPS40042 enters a calibration
cycle where the short circuit current threshold is determined. The TPS40042 monitors the current out of the
COMP pin and selects a threshold based on the sensed value of the current. See Selecting the Short Circuit
Current Limit Threshold section for for details. When this calibration time is completed, the soft-start cycle is
allowed to begin. See Figure 15 below.
Figure 15. Startup with VREFIN =1.5 V
DESIGN
If the enable function is not used, the EN pin should be connected to ground
HINT:
(GND).
DESIGN
When designing the feedback loop compensation, ensure the capacitors used
HINT:
are not so large that they distort the COMP pin calibration waveform.
At the end of a calibration cycle, the TPS40042 slowly increases the voltage to the non-inverting input of the
error amplifier. In this way, the output voltage slowly ramps up until the voltage on the non-inverting input to the
error amplifier reaches the external (VREFIN) reference voltage. At that time, the voltage at the non-inverting input
to the error amplifier remains at the applied reference voltage.
During the soft-start interval, pulse-by-pulse current limiting is active. If seven consecutive current limit pulses are
detected, overcurrent is declared and a timeout period equivalent to seven calibration/soft-start cycles goes into
effect. See Output Short Circuit Protection section for details.
Since the rate of rise of the output voltage is constant with different REFIN voltage levels, the actual soft start
time is directly proportional to the value of the external reference voltage. The rate of rise at the non-inverting
input of the error amplifier is 0.25 V/ms. The rate of rise measured at the output terminals of the DC/DC
converter will be increased by the output voltage-to-reference voltage ratio.
For example, if a 1-V external reference is applied for a 1.5-V output DC/DC converter, the soft-start
time-to-output voltage regulation is 4 ms.
Copyright 2007, Texas Instruments Incorporated
11
Product Folder Link(s): TPS40042
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| TPS40050PWPR | 功能描述:DC/DC 開(kāi)關(guān)控制器 Wide Input Vltg Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開(kāi)關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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