參數(shù)資料
型號(hào)： PTV08T250WAD
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
文件頁(yè)數(shù)： 16/30頁(yè)
文件大?。?/td> 795K
代理商： PTV08T250WAD
Output On/Off Inhibit
PTV08T250W
6,7
13,14
20,21
4
5
11
VI
CI
16
Inhibit/
UVLO
GND
1= Inhibit
Q1
BSS138
V
(2V/div)
INH
I (2 A/div)
I
t-Time=2ms/div
V
(1V/div)
O
www.ti.com .......................................................................................................................................... SLTS260E – OCTOBER 2005 – REVISED NOVEMBER 2008
For applications requiring output voltage on/off control, the PTV08T250W incorporates an output 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 21 shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit input
has its own internal pull-up to a potential of 5 V. The input is not compatible with TTL logic devices and should
not be tied to VI. An open-collector (or open-drain) discrete transistor is recommended for control.
Figure 21. 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 25
ms. Figure 22 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, Q1 VDS. The waveforms were measured with a 20-A
constant current load.
Figure 22. Power-Up Response from Inhibit Control
Copyright 2005–2008, Texas Instruments Incorporated
23
Product Folder Link(s): PTV08T250W
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