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| 型号： | PTV08T250WAD |
| 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 |
| 文件页数： | 15/30页 |
| 文件大小： | 795K |
| 代理商： | PTV08T250WAD |
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Overcurrent Protection
Overtemperature Protection (OTP)
Remote Sense
SLTS260E – OCTOBER 2005 – REVISED NOVEMBER 2008 .......................................................................................................................................... www.ti.com
The output then progressively rises to the module’s setpoint voltage. Figure 20 shows the soft-start power-up
characteristic of the PTV08T250W operating from a 12-V input bus and configured for a 3.3-V output. The
waveforms were measured with a 20-A constant current 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.
A thermal shutdown mechanism 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 sensed temperature decreases
by about 10°C below the trip point.
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.
Products with this feature incorporate one or two remote sense pins. Remote sensing improves the load
regulation performance of the module by allowing it to compensate for any IR voltage drop between its output
and the load. An IR drop is caused by the high output current flowing through the small amount of pin and trace
resistance.
To use this feature simply connect the Sense pins to the corresponding output voltage node, close to the load
circuit. If a sense pin is left open-circuit, an internal low-value resistor (15-
or less) connected between the pin
and the output node, ensures the output remains in regulation.
With the sense pin connected, the difference between the voltage measured directly between the VO and GND
pins, and that measured at the Sense pins, is the amount of IR drop being compensated by the regulator. This
should be limited to a maximum of 0.3 V.
The remote sense feature is not designed to compensate for the forward drop of nonlinear or frequency
dependent components that may be placed in series with the converter output. Examples include OR-ing
diodes, filter inductors, ferrite beads, and fuses. When these components are enclosed by the remote sense
connection they are effectively placed inside the regulation control loop, which can adversely affect the
stability of the regulator.
22
Copyright 2005–2008, Texas Instruments Incorporated
Product Folder Link(s): PTV08T250W
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| PTV08T250WAH | 功能描述:DC/DC转换器 50A 8-14V-Inp/Wide Out Adj Vert Pwr Mdl 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: |
| PTV09 | 制造商:BOURNS 制造商全称:Bourns Electronic Solutions 功能描述:9 mm Potentiometer |
| PTV09A-2015F-A102 | 制造商:BOURNS 制造商全称:Bourns Electronic Solutions 功能描述:9 mm Potentiometer |
| PTV09A-2015F-A202 | 制造商:BOURNS 制造商全称:Bourns Electronic Solutions 功能描述:9 mm Potentiometer |
| PTV09A-2015F-A502 | 制造商:BOURNS 制造商全称:Bourns Electronic Solutions 功能描述:9 mm Potentiometer |
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