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參數資料
| 型號： | PTH12040WAZ |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 電源模塊 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封裝： | ROHS COMPLIANT, DIP-20 |
| 文件頁數： | 10/27頁 |
| 文件大?。?/td> | 633K |
| 代理商： | PTH12040WAZ |
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SLTS237G – DECEMBER 2004 – REVISED MARCH 2009............................................................................................................................................... www.ti.com
Typical Application
The basic implementation of Auto-Track allows for simultaneous voltage sequencing of a number of Auto-Track
compliant modules. Connecting the Track inputs of two or more modules forces their Track input to follow the
same collective RC-ramp waveform, and allows their power-up sequence to be coordinated from a common
Track control signal. This can be an open-collector (or open-drain) device, such as a power-up reset voltage
supervisor IC. See U3 in Figure 14.
To coordinate a power-up sequence, the Track control must first be pulled to ground potential. This should be
done at or before input power is applied to the modules. The ground signal should be maintained for at least
20 ms after input power has been applied. This brief period gives the modules time to complete their internal
soft-start initialization (4), enabling them to produce an output voltage. A low-cost supply voltage supervisor IC,
that includes a built-in time delay, is an ideal component for automatically controlling the Track inputs at power
up.
Figure 14 shows how the TL7712A supply voltage supervisor IC (U3) can be used to coordinate the sequenced
power PTH12040W modules. The output of the TL7712A supervisor becomes active above an input voltage of
3.6 V, enabling it to assert a ground signal to the common Track control well before the input voltage has
reached the module's undervoltage lockout threshold. The ground signal is maintained until approximately 28 ms
after the input voltage has risen above U3's voltage threshold, which is 10.95 V. The 28-ms time period is
controlled by the capacitor C3. The value of 2.2 F provides sufficient time delay for the modules to complete
their internal soft-start initialization. The output voltage of each module remains at zero until the Track control
voltage is allowed to rise. When U3 removes the ground signal, the Track control voltage automatically rises.
This causes the output voltage of each module to rise simultaneously with the other modules, until each reaches
its respective set-point voltage.
Figure 15 shows the output voltage waveforms from the circuit of Figure 14 after input voltage is applied to the
circuit. The waveforms, VO1 and VO2, represent the output voltages from the two power modules, U1 (3.3 V) and
U2 (1.8 V), respectively. VTRK, VO1, and VO2 are shown rising together to produce the desired simultaneous
power-up characteristic.
The same circuit also provides a power-down sequence. When the input voltage falls below U3's voltage
threshold, the ground signal is re-applied to the common Track control. This pulls the Track inputs to zero volts,
forcing the output of each module to follow, as shown in Figure 16. In order for a simultaneous power-down to
occur, the Track inputs must be pulled low before the input voltage has fallen below the modules' undervoltage
lockout. This is an important constraint. Once the modules recognize that a valid input voltage is no longer
present, their outputs can no longer follow the voltage applied at their Track input. During a power-down
sequence, the fall in the output voltage from the modules is limited by the maximum output capacitance and the
Auto-Track slew rate.
Notes on Use of Auto-Track
1. The Track pin voltage must be allowed to rise above the module set-point voltage before the module
regulates at its adjusted set-point voltage.
2. The Auto-Track function tracks almost any voltage ramp during power up, and is compatible with ramp
speeds of up to 1 V/ms.
3. The absolute maximum voltage that may be applied to the Track pin is the input voltage VI.
4. The module cannot follow a voltage at its Track control input until it has completed its soft-start initialization.
This takes about 20 ms from the time that a valid voltage has been applied to its input. During this period, it
is recommended that the Track pin be held at ground potential.
5. The Auto-Track function is disabled by connecting the Track pin to the input voltage (VI). When Auto-Track is
disabled, the output voltage rises at a quicker and more linear rate after input power has been applied.
18
Copyright 2004–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH12040W
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相關代理商/技術參數 |
參數描述 |
|---|---|
| PTH12040WAZT | 功能描述:DC/DC轉換器 8.0-14Vin 5.5V 50A 2.045" x1.045"x0.357 RoHS:否 制造商:Murata 產品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓（標稱）: 輸出端數量:1 輸出電壓（通道 1）:3.3 V 輸出電流（通道 1）:600 mA 輸出電壓（通道 2）: 輸出電流（通道 2）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
| PTH12045WAD | 制造商:Texas Instruments 功能描述: |
| PTH12045WAZ | 制造商:Texas Instruments 功能描述:- Rail/Tube |
| PTH12050 | 制造商:EMERSON-NETWORKPOWER 制造商全稱:Emerson Network Power 功能描述:DC-DC CONVERTERS |
| PTH12050L | 制造商:EMERSON-NETWORKPOWER 制造商全稱:Emerson Network Power 功能描述:12 Vin |
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