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| 型号： | PTH08T261WAZT |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIAT PACKAGE-10 |
| 文件页数： | 21/38页 |
| 文件大小： | 1206K |
| 代理商： | PTH08T261WAZT |
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SLTS272F
– DECEMBER 2006 – REVISED APRIL 2011
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 26 shows the output voltage waveforms 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 27. Power down is normally complete before the
input voltage has fallen below the modules' undervoltage lockout. This is an important constraint. Once the
modules recognize that an 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 Auto-Track slew rate capability.
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.
28
Copyright
2006–2011, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
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| PTH-11810-B | 功能描述:罩类、盒类及壳类产品 3.58"x 3.11"x 1.77" 1-way, black RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH-11810-G | 功能描述:罩类、盒类及壳类产品 3.58"x 3.11"x 1.77" 1-way, gray RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH-11811-B | 功能描述:罩类、盒类及壳类产品 3.58"x 4.80"x 1.77" 2-way, black RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH-11811-G | 功能描述:罩类、盒类及壳类产品 3.58"x 4.80"x 1.77" 2-way, gray RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH12000L | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, 12-V Input Non-Isolated Wide-Output Adjust Power Module |
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