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| 型号： | PTH04T221WAS |
| 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： | PLASTIC, DIP-11 |
| 文件页数： | 15/39页 |
| 文件大小： | 1247K |
| 代理商： | PTH04T221WAS |
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UNDERVOLTAGE LOCKOUT (UVLO)
R
UVLO +
68.54 * VTHD
V
THD * 2.07
kW
(5)
Inhibit/
UVLO Prog
GND
3
1
10
2
+
GND
VI
CI
RUVLO
VI
UDG06052
PTH04T220W/221W
SLTS275D – DECEMBER 2006 – REVISED JULY 2009 ................................................................................................................................................... www.ti.com
The PTH04T220/221W 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 PTH04T220/221W module allows for limited adjustment of the ON threshold voltage.
The adjustment is made via the Inhbit/UVLO Prog control pin (pin 10) using a single resistor (see Figure 20).
When pin 10 is left open circuit, the ON threshold voltage is internally set to its default value, which is 1.95 volts.
The ON threshold might need to be raised if the module is powered from a tightly regulated 5-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 1.95 V,
and it may only be adjusted to a higher value.
Table 7 lists the 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)
2.5
3.0
3.5
4.0
4.5
RUVLO (kΩ)
154
71.5
53.6
33.2
26.7
Figure 20. Undervoltage Lockout Adjustment Resistor Placement
22
Copyright 2006–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH04T220W PTH04T221W
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| PTH04T221WAST | 功能描述:DC/DC转换器 16A 2.2V-5.5Vin Cer Cap Ver 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: |
| PTH04T221WAZ | 功能描述:DC/DC转换器 16A 2.2V-5.5Vin Cer Cap Ver 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: |
| PTH04T221WAZT | 功能描述:DC/DC转换器 16A 2.2V-5.5Vin Cer Cap Ver 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: |
| PTH04T230W | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, 2.2-V to 5.5-V INPUT, NON-ISOLATED, WIDE-OUTPUT, ADJUSTABLE POWER MODULE WITH TurboTrans |
| PTH04T230WAD | 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: |
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