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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)： | 9/26頁 |
| 文件大?。?/td> | 669K |
| 代理商： | PTN78020HAH |
t-Time=5ms/div
VI (5V/div)
VO (2V/div)
II (2 A/div)
Undervoltage Lockout
Current-Limit Protection
Overtemperature Protection
www.ti.com .................................................................................................................................................. SLTS228B – DECEMBER 2004 – REVISED APRIL 2008
Figure 26. Power-Up Waveforms
The undervoltage lockout (UVLO) circuit prevents the module from attempting to power up until the input voltage
is above the UVLO threshold. This is to prevent the module from drawing excessive current from the input source
at power up. Below the UVLO threshold, the module is held off.
The PTN78020 modules protect against load faults with a continuous current limit characteristic. 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 module to progressively reduce its output voltage. Current is continuously
supplied to the fault until it is removed. On removal of the fault, the output voltage promptly recovers. When
limiting output current, the regulator experiences higher power dissipation, which increases its temperature. If the
temperature increase is excessive, the module overtemperature protection begins to periodically turn the output
voltage completely off.
A thermal shutdown mechanism protects the module's 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 sustained current limit
condition. If the junction temperature of the internal control IC rises excessively, the module turns itself off,
reducing the output voltage to zero. The module instantly restarts when the sensed temperature decreases by a
few degrees.
Overtemperature protection is a last resort mechanism to prevent damage to the module. It should not be relied
on as permanent protection against thermal stress. Always operate the module within its temperature derated
limits, for the worst-case operating conditions of output current, ambient temperature, and airflow. Operating the
module above these limits, albeit below the thermal shutdown temperature, reduces the long-term reliability of
the module.
Copyright 2004–2008, Texas Instruments Incorporated
17
Product Folder Link(s): PTN78020W PTN78020H
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|---|---|
| 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）: 安裝風格:SMD/SMT 封裝 / 箱體尺寸: |
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