参数资料
型号: PTH08T221WAD
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, PLASTIC, DIP-11
文件页数: 17/38页
文件大小: 1290K
代理商: PTH08T221WAD
On/Off Inhibit
11
Inhibit/
UVLO
GND
2
GND
3,4
VI
1 = Inhibit
Q1
BSS 138
CI
PTH08T220W/221W
t Time 4ms/div
VO (2V/div)
II (2 A/div)
V
(2V/div)
INH
SLTS252K – NOVEMBER 2005 – REVISED JUNE 2009................................................................................................................................................... www.ti.com
For applications requiring output voltage on/off control, the PTH08T220/221W incorporates an Inhibit control pin.
The inhibit feature can be used wherever there is a requirement for the output voltage from the regulator to be
turned off.
The power modules function normally when the Inhibit pin is left open-circuit, providing a regulated output
whenever a valid source voltage is connected to VI with respect to GND.
Figure 24 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit input
has its own internal pull-up. An external pull-up resistor should never be used with the inhibit pin. The input is not
compatible with TTL logic devices. An open-collector (or open-drain) discrete transistor is recommended for
control.
Figure 24. On/Off Inhibit Control Circuit
Turning Q1 on applies a low voltage to the Inhibit control pin and disables the output of the module. If Q1 is then
turned off, the module executes a soft-start power-up sequence. A regulated output voltage is produced within 15
ms. Figure 25 shows the typical rise in both the output voltage and input current, following the turn-off of Q1. The
turn off of Q1 corresponds to the rise in the waveform, VINH. The waveforms were measured with a 10-A constant
current load.
Figure 25. Power-Up Response from Inhibit Control
24
Copyright 2005–2009, Texas Instruments Incorporated
Product Folder Link(s): PTH08T220W PTH08T221W
相关PDF资料
PDF描述
PTH08T220WAZ 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T221WAS 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T221WAST 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T221WAZT 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
PTH08T220WAST 1-OUTPUT DC-DC REG PWR SUPPLY MODULE
相关代理商/技术参数
参数描述
PTH08T221WAD 制造商:Texas Instruments 功能描述:Power Module
PTH08T221WAS 功能描述:DC/DC转换器 16A 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:
PTH08T221WAST 功能描述:DC/DC转换器 16A 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:
PTH08T221WAZ 功能描述:DC/DC转换器 16A 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:
PTH08T221WAZT 功能描述:DC/DC转换器 16A 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: