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| 型号： | PTH12030WAZ |
| 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 PACKAGE-13 |
| 文件页数： | 5/26页 |
| 文件大小： | 794K |
| 代理商： | PTH12030WAZ |
SOFT-START POWER UP
12V
C
1000 F
I
m
+
C
330 F
O
m
+
GND
3.3V
R
2k
0.1W
1%
SET
W
PTH12020W
7
10
4
5
6
2
3
9
Track
V
I
V
O
GND
Inhibit
1
Up Dn
Adjust
8
Sense
VI (5 V/div)
t Time 5 ms/div
VO (1 V/div)
II (5 V/div)
OVERCURRENT PROTECTION
OVERTEMPERATURE PROTECTION (OTP)
www.ti.com .................................................................................................................................................... SLTS211H – MAY 2003 – REVISED DECEMBER 2008
The Auto-Track feature allows the power-up of multiple PTH modules to be directly controlled from the Track pin.
However, in a stand-alone configuration, or when the Auto-Track feature is not being used, the Track pin should
When the Track pin is connected to the input voltage the Auto-Track function is permanently disengaged. This
allows the module to power up entirely under the control of its internal soft-start circuitry. When power up is
under soft-start control, the output voltage rises to the set-point at a quicker and more linear rate.
Figure 11. Power-Up Application Circuit
Figure 12. Power-Up Waveforms
From the moment a valid input voltage is applied, the soft-start control introduces a short time delay (typically
8 ms-15 ms) before allowing the output voltage to rise. The output then progressively rises to the module’s
setpoint voltage. Figure 12 shows the soft-start power-up characteristic of the 18-A output product
(PTH12020W), operating from a 12-V input bus and configured for a 3.3-V output. The waveforms were
measured with a 5-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.
For protection against load faults, all modules incorporate output overcurrent protection. Applying a load that
exceeds the regulator’s overcurrent threshold causes the regulated output to shut down. Following shutdown a
module periodically attempts to recover by initiating a soft-start power-up. This is described as a hiccup mode of
operation, whereby the module continues in a cycle of successive shutdown and power up until the load fault is
removed. During this period, the average current flowing into the fault is significantly reduced. Once the fault is
removed, the module automatically recovers and returns to normal operation.
The PTH12020W and PTH12030W products have overtemperature protection. These products have an on-board
temperature sensor that protects the module’s internal circuitry against excessively high temperatures. A rise in
the internal temperature may be the result of a drop in airflow, or a high ambient temperature. If the internal
temperature exceeds the OTP threshold, the module’s Inhibit control is internally pulled low. This turns the output
off. The output voltage drops as the external output capacitors are discharged by the load circuit. The recovery is
automatic, and begins with a soft-start power up. It occurs when the the sensed temperature decreases by about
10°C below the trip point.
Note: The overtemperature protection is a last resort mechanism to prevent thermal stress to the regulator.
Operation at or close to the thermal shutdown temperature is not recommended and reduces the long-term
reliability of the module. Always operate the regulator within the specified safe operating area (SOA) limits for
the worst-case conditions of ambient temperature and airflow.
Copyright 2003–2008, Texas Instruments Incorporated
13
Product Folder Link(s): PTH12030W/L
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH12030WAZT | 功能描述:DC/DC转换器 10.2-13.8Vin 5.5V26A 1.370" x1.120"x0.354 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: |
| PTH12040 | 制造商:EMERSON-NETWORKPOWER 制造商全称:Emerson Network Power 功能描述:DC-DC CONVERTERS |
| PTH12040W | 制造商:TI 制造商全称:Texas Instruments 功能描述:50-A, 8-V to 14-V INPUT, NON-ISOLATED WIDE-OUTPUT ADJUST POWER MODULE |
| PTH12040WAD | 功能描述:DC/DC转换器 50-A 8-14V-Inp Wide Out Adj 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: |
| PTH12040WADT | 制造商:ARTESYN 制造商全称:Artesyn Technologies 功能描述:DC-DC CONVERTERS POLA Non-isolated |
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