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參數(shù)資料
| 型號： | PTH08T210WAD |
| 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-14 |
| 文件頁數(shù)： | 13/31頁 |
| 文件大?。?/td> | 1235K |
| 代理商： | PTH08T210WAD |
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UNDERVOLTAGE LOCKOUT (UVLO)
UVLO Adjustment
R
=
UVLO
kW
2590-(24.9x(V -1))
I
24.9x(V -1)-100
I
(3)
2
3
4
1
Inhibit/
UVLO Prog
GND
VI
RUVLO
CI
PTH08T210W
SLTS262I – OCTOBER 2005 – REVISED MARCH 2009 ................................................................................................................................................... www.ti.com
The PTH08T210W power modules incorporate an input undervoltage lockout (UVLO). The UVLO feature
prevents the operation of the module until there is sufficient input voltage to produce a valid output voltage. This
enables the module to provide a clean, monotonic powerup for the load circuit, and also limits the magnitude of
current drawn from the regulator’s input source during the power-up sequence.
The UVLO characteristic is defined by the ON threshold (VTHD) voltage. Below the ON threshold the module does
not produce an output. The Inhibit control becomes active when the input voltage is greater then 4.25 V. The
hysterisis voltage, which is the difference between the ON and OFF threshold voltages, is nominally set at
900mV. The hysterisis prevents start-up oscillations, which can occur if the input voltage droops slightly when the
module begins drawing current from the input source.
The UVLO feature of the PTH08T210W module allows for limited adjustment of the ON threshold voltage. The
adjustment is made via the Inhbit/UVLO Prog control pin (pin 1). When pin 1 is left open circuit, the ON threshold
voltage is internally set to its default value. The ON threshold has a nominal voltage of 5.0 V, and the hysterisis
900 mV. This ensures that the module produces a regulated output when the minimum input voltage is applied.
The ON threshold might need to be increased if the module is powered from a tightly regulated 12-V bus. This
allows the ON threshold voltage to be set for a specified input voltage. Adjusting the threshold voltage prevents
the module from operating if the input bus fails to completely rise to its specified regulation voltage.
Equation 3 determines the value of RTHD required to adjust VTHD to a new value. The default value is 5 V, and it
may only be adjusted to a higher value.
Table 7 lists the standard resistor values for RUVLO for different options of the on-threshold (VTHD) voltage.
Table 7. Calculated Values of RUVLO for Various Values of VTHD
VTHD
6.5 V
7.0 V
7.5 V
8.0 V
8.5 V
9.0 V
9.5 V
10.0 V
10.5 V
RUVLO
66.5 k
49.9 k
39.2 k
32.4 k
27.4 k
24.3 k
21.5 k
19.1 k
17.4 k
Figure 19. UVLO Program Resistor Placement
20
Copyright 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH08T210W
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| PTH08T210WAH | 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl RoHS:否 制造商:Murata 產(chǎn)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(shù)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: |
| PTH08T210WAS | 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl RoHS:否 制造商:Murata 產(chǎn)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(shù)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: |
| PTH08T210WAST | 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl RoHS:否 制造商:Murata 產(chǎn)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(shù)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: |
| PTH08T210WAZ | 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl RoHS:否 制造商:Murata 產(chǎn)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(shù)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: |
| PTH08T210WAZT | 功能描述:DC/DC轉(zhuǎn)換器 30A 5.5-14V-Inp Wide-Out Adj Pwr Mdl RoHS:否 制造商:Murata 產(chǎn)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(shù)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: |
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