參數(shù)資料
型號: PTN78020HAH
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
封裝: DIP-7
文件頁數(shù): 10/26頁
文件大?。?/td> 669K
代理商: PTN78020HAH
Output On/Off Inhibit
Inhibit
GND
1 %
(Ceramic)
PTN78020
1
4
6
2
3
Adjust
GND
VO
VI
VI =12V
VO =5V
Inhibit
7
5
Sense
+
Q1
BSS138
L
O
A
D
21k
CI
2.2 F
m
CO
330 F
m
RSET
0.05W
t-Time=5ms/div
VO (2V/div)
II (2 A/div)
Q1VGS (10V/div)
SLTS228B – DECEMBER 2004 – REVISED APRIL 2008 .................................................................................................................................................. www.ti.com
For applications requiring output voltage on/off control, the PTN78020 power module incorporates an output
on/off Inhibit control (pin 3). The inhibit feature can be used wherever there is a requirement for the output
voltage from the regulator to be turned off.
The power module functions 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 27 shows the the circuit used to
demonstrate the inhibit function. Note the discrete transistor (Q1). Turning Q1 on applies a low voltage to the
Inhibit control pin and turns the module off. The output voltage decays as the load circuit discharges the
capacitance. The current drawn at the input is reduced to typically 17 mA. If Q1 is then turned off, the module
executes a soft-start power up. A regulated output voltage is produced within 20 ms. Figure 28 shows the typical
rise in the output voltage, following the turn off of Q1. The turn off of Q1 corresponds to the fall in the waveform,
Q1 Vgs. The waveforms were measured with a 1.5-A resistive load.
Figure 27. On/Off Inhibit Control Circuit
Figure 28. Power Up Response From Inhibit Control
18
Copyright 2004–2008, Texas Instruments Incorporated
Product Folder Link(s): PTN78020W PTN78020H
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參數(shù)描述
PTN78020HAH 制造商:Texas Instruments 功能描述:DC-DC Converter
PTN78020HAS 功能描述:DC/DC轉(zhuǎn)換器 6A Wide-In Wide Output Adj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓(標(biāo)稱): 輸出端數(shù)量:1 輸出電壓(通道 1):3.3 V 輸出電流(通道 1):600 mA 輸出電壓(通道 2): 輸出電流(通道 2): 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTN78020HAST 功能描述:DC/DC轉(zhuǎn)換器 6A Wide-In Wide Output Adj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓(標(biāo)稱): 輸出端數(shù)量:1 輸出電壓(通道 1):3.3 V 輸出電流(通道 1):600 mA 輸出電壓(通道 2): 輸出電流(通道 2): 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTN78020HAZ 功能描述:DC/DC轉(zhuǎn)換器 6A Wide-In Wide Output Adj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓(標(biāo)稱): 輸出端數(shù)量:1 輸出電壓(通道 1):3.3 V 輸出電流(通道 1):600 mA 輸出電壓(通道 2): 輸出電流(通道 2): 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸:
PTN78020HAZT 功能描述:DC/DC轉(zhuǎn)換器 6A Wide-In Wide Output Adj Module RoHS:否 制造商:Murata 產(chǎn)品: 輸出功率: 輸入電壓范圍:3.6 V to 5.5 V 輸入電壓(標(biāo)稱): 輸出端數(shù)量:1 輸出電壓(通道 1):3.3 V 輸出電流(通道 1):600 mA 輸出電壓(通道 2): 輸出電流(通道 2): 安裝風(fēng)格:SMD/SMT 封裝 / 箱體尺寸: