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参数资料
| 型号： | PTH08T261WAZT |
| 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 COMPLIAT PACKAGE-10 |
| 文件页数： | 17/38页 |
| 文件大小： | 1206K |
| 代理商： | PTH08T261WAZT |
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PTH08T260W
2
3
+
GND
Track
9
GND
VI
UDG06081
t-Time=4ms/div
I (1 A/div)
I
V (5V/div)
I
V
(2V/div)
O
SLTS272F
– DECEMBER 2006 – REVISED APRIL 2011
Soft-Start Power Up
The Auto-Track feature allows the power-up of multiple PTH/PTV 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
Figure 18. Defeating the Auto-Track Function
Figure 19. Power-Up Waveform
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. From the
moment a valid input voltage is applied, the soft-start control introduces a short time delay (typically 2 ms
–10 ms)
before allowing the output voltage to rise. The output then progressively rises to the module
’s setpoint voltage.
Figure 19 shows the soft-start power-up characteristic of the PTH08T260W operating from a 12-V input bus and
configured for a 3.3-V output. The waveforms were measured with a 3-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 20 ms.
Overcurrent Protection
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.
Overtemperature Protection (OTP)
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.
24
Copyright
2006–2011, Texas Instruments Incorporated
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相关代理商/技术参数 |
参数描述 |
|---|---|
| PTH-11810-B | 功能描述:罩类、盒类及壳类产品 3.58"x 3.11"x 1.77" 1-way, black RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH-11810-G | 功能描述:罩类、盒类及壳类产品 3.58"x 3.11"x 1.77" 1-way, gray RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH-11811-B | 功能描述:罩类、盒类及壳类产品 3.58"x 4.80"x 1.77" 2-way, black RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH-11811-G | 功能描述:罩类、盒类及壳类产品 3.58"x 4.80"x 1.77" 2-way, gray RoHS:否 制造商:Bud Industries 产品:Boxes 外部深度:6.35 mm 外部宽度:6.35 mm 外部高度:2.56 mm NEMA 额定值: IP 等级: 材料:Acrylonitrile Butadiene Styrene (ABS) 颜色:Red |
| PTH12000L | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, 12-V Input Non-Isolated Wide-Output Adjust Power Module |
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