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| 型号： | PTH08T240WAZ |
| 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 COMPLIANT PACKAGE-11 |
| 文件页数： | 15/39页 |
| 文件大小： | 1366K |
| 代理商： | PTH08T240WAZ |
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UNDERVOLTAGE LOCKOUT (UVLO)
R
UVLO +
9690
* 137
V
I
137
V
I * 585
(kW)
(5)
2
3
4
11
Inhibit/
UVLO Prog
GND
VI
RUVLO
CI
PTH08T240W/241W
SLTS264J – NOVEMBER 2005 – REVISED JUNE 2009 ................................................................................................................................................... www.ti.com
The PTH08T240/241W 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 Inhibit
control is overridden, and the module does not produce an output. The hysteresis voltage, which is the difference
between the ON and OFF threshold voltages, is set at 500 mV. The hysteresis 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 PTH08T240/241W module allows for limited adjustment of the ON threshold voltage.
The adjustment is made via the Inhbit/UVLO Prog control pin (pin 11) using a single resistor (see Figure 20).
When pin 11 is left open circuit, the ON threshold voltage is internally set to its default value, which is 4.3 volts.
The ON threshold might need to be raised if the module is powered from a tightly regulated 12-V bus. Adjusting
the threshold prevents the module from operating if the input bus fails to completely rise to its specified
regulation voltage.
Equation 5 determines the value of RUVLO required to adjust VTHD to a new value. The default value is 4.3 V, and
it may only be adjusted to a higher value.
Table 7 shows a chart of standard resistor values for RUVLO for different options of the on-threshold (VTHD)
voltage.
Table 7. Standard RUVLO values for Various VTHD values
VTHD (V)
5.0
5.5
6.0
6.5
7.0
7.5
8.0
8.5
9.0
9.5
10.0
10.5
11.0
RUVLO (kΩ)
88.7
52.3
37.4
28.7
23.2
19.6
16.9
14.7
13.0
11.8
10.5
9.76
8.87
Figure 20. Undervoltage Lockout Adjustment Resistor Placement
22
Copyright 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH08T240W PTH08T241W
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH08T240WAZ | 制造商:Texas Instruments 功能描述:DC/DC Converter |
| PTH08T240WAZT | 功能描述:DC/DC转换器 10A 4.5-14V-Input Wide-Out Adj Pwr Mdl RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T241W | 制造商:TI 制造商全称:Texas Instruments 功能描述:10-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TURBOTRANS |
| PTH08T241WAD | 功能描述:DC/DC转换器 10A 4.5V to 14V Inp Ceramic Cap Version RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
| PTH08T241WAS | 功能描述:DC/DC转换器 10A 4.5V to 14V Inp Ceramic Cap Version RoHS:否 制造商:Murata 产品: 输出功率: 输入电压范围:3.6 V to 5.5 V 输入电压（标称）: 输出端数量:1 输出电压（通道 1）:3.3 V 输出电流（通道 1）:600 mA 输出电压（通道 2）: 输出电流（通道 2）: 安装风格:SMD/SMT 封装 / 箱体尺寸: |
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