參數(shù)資料
型號(hào)： PTH08000WAS2
廠商： Texas Instruments, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： RADIATION HARDENED HIGH EFFICIENCY, 5 AMP SWITCHING REGULATORS
中文描述： 抗輻射高效，5安培開關(guān)穩(wěn)壓器
文件頁(yè)數(shù)： 12/20頁(yè)
文件大小： 1402K
代理商： PTH08000WAS2
www.ti.com
Current Limit Protection
The PTH08000 modules protect against load faults with an output overcurrent trip. Under a load fault condition,
the output current cannot exceed the current limit value. Attempting to draw current that exceeds the current limit
value causes the output voltage to enter into a
hiccup
mode of operation, whereby the module continues in a
cycle of successive shutdown and power up until the load fault is removed. On removal of the fault, the output
voltage promptly recovers.
Thermal Shutdown
Thermal shutdown protects the module internal circuitry against excessively high temperatures. A rise in
temperature may be the result of a drop in airflow, a high ambient temperature, or a higher than normal output
current. If the junction temperature of the internal components exceeds 165°C, the module shuts down. This
reduces the output voltage to zero. The module starts up automatically, by initiating a soft-start power up when
the sensed temperature decreases 10°C below the thermal shutdown trip-point.
Output On/Off Inhibit
For applications requiring output voltage on/off control, the PTH08000 power module incorporates an output
on/off Inhibit control (pin 4). The inhibit feature can be used wherever there is a requirement for the output
voltage from the regulator to be turned off.
V =12V
I
V
=3.3V
O
Inhibit
GND
GND
1.87k
0.05W,1%
W
PTH08000W
1
2
5
6
3
4
V
Adj
O
Track
GND
Inhibit
V
I
V
O
Q1
BSS138
L
O
A
D
C
100 F
(Optional)
O
m
C
100 F
(Required)
I
m
PTH08000W
SLTS248–JUNE 2005
From the moment a valid input voltage is applied, the soft-start control introduces a short time delay (typically
less than 5 ms) before allowing the output voltage to rise. The output then progressively rises to the module
set-point voltage.
Figure 11
shows the soft-start power-up characteristic of the PTH0800W, operating from a
12-V input bus and configured for a 3.3-V output. The waveforms were measured with a 2-A resistive load and
the Auto-Track feature disabled. The initial rise in input current when the input voltage first starts to rise is the
charge current drawn by the input capacitors. Power up is complete within 25 ms.
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 V
I
with respect to GND.
Figure 12
shows the typical application of the inhibit function. Note the discrete transistor (Q1). The Inhibit control
has its own internal pullup to 3 V. An open-collector or open-drain device is recommended to control this input.
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
20 ms.
Figure 13
shows the typical rise in the output voltage, following the turn off of Q1. The turn off of Q1
corresponds to the rise in the waveform, Q1 V
DS
. The waveforms were measured with a 2-A resistive load.
Figure 12. On/Off Inhibit Control Circuit
12
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PTH08000WAST 功能描述:DC/DC轉(zhuǎn)換器 2.25A 5/12V Input WideAdj 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:
PTH08000WAZ 功能描述:DC/DC轉(zhuǎn)換器 2.25A 5/12V Input WideAdj 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:
PTH08000WAZ1 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.25-A, WIDE INPUT, ADJUSTABLE SWITCHING REGULATOR
PTH08000WAZ2 制造商:TI 制造商全稱:Texas Instruments 功能描述:2.25-A, WIDE INPUT, ADJUSTABLE SWITCHING REGULATOR
PTH08000WAZT 功能描述:DC/DC轉(zhuǎn)換器 2.25A 5/12V Input WideAdj 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:
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