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参数资料
| 型号： | PTH08T230WAST |
| 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 |
| 文件页数： | 16/39页 |
| 文件大小： | 1281K |
| 代理商： | PTH08T230WAST |
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R
UVLO
=
70.74-V
THD
V
-4.26
THD
k W
Inhibit/
UVLO Prog
GND
PTH08T230W
3
2
10
+
GND
RUVLO
VI
CI
www.ti.com
SLTS265K – NOVEMBER 2005 – REVISED JUNE 2010
UNDERVOLTAGE LOCKOUT (UVLO)
The PTH08T230/231W 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 PTH08T230/231W module allows for limited adjustment of the ON threshold voltage.
The adjustment is made via the Inhibit/UVLO control pin (pin 10) using a single resistor (see Figure 19). When
pin 10 is left open circuit, the ON threshold voltage is internally set to its default value, which is 4.3 V. 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.
Threshold Adjust
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 be adjusted, but only to a higher value.
(5)
Calculated Values
Table 7 shows a chart of standard resistor values for RUVLO for different values 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 (k)
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 19. UVLO Implementation
Copyright 2005–2010, Texas Instruments Incorporated
23
Product Folder Link(s): PTH08T230W PTH08T231W
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| PTH08T230WAZ | 功能描述:DC/DC转换器 6A 2.2-5.5V Input Non Isolated POL 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: |
| PTH08T230WAZT | 功能描述:DC/DC转换器 6A 2.2-5.5V Input Non Isolated POL 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: |
| PTH08T231W | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, 4.5-V to 14-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans⑩ |
| PTH08T231WAD | 功能描述:DC/DC转换器 6A 4.5V-14Vin Cer Cap Adj Pwr Module 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: |
| PTH08T231WAS | 功能描述:DC/DC转换器 6A 4.5V-14Vin Cer Cap Adj Pwr Module 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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