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参数资料
| 型号： | PTN78020AAH |
| 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 |
| 文件页数： | 5/20页 |
| 文件大小： | 1237K |
| 代理商： | PTN78020AAH |
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Power-Up Characteristics
t - Time = 5 ms/div
VI (5 V/div)
VO (2 V/div)
II (2 A/div)
Undervoltage Lockout
Current Limit Protection
Overtemperature Protection
PTN78020A
SLTS244A – APRIL 2005 – REVISED MAY 2005
When configured per the standard application, the PTN78020A power module produces a regulated output
voltage following the application of a valid input source voltage. During power up, internal soft-start circuitry slows
the rate that the output voltage rises, thereby limiting the amount of in-rush current that can be drawn from the
input source. The soft-start circuitry introduces a short time delay (typically 5 ms – 10 ms) into the power-up
characteristic. This is from the point that a valid input source is recognized. Figure 18 shows the power-up
waveforms for a PTN78020A, operating from a 12-V input and with the output voltage adjusted to –5-V. The
waveforms were measured with a 3-A resistive load.
Figure 18. 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 prevents 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.
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| PTN78020AAS | 功能描述:DC/DC转换器 4A Wide Inp/Neg Out Adj 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: |
| PTN78020AAST | 功能描述:DC/DC转换器 4A Wide Inp/Neg Out Adj 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: |
| PTN78020AAZ | 功能描述:DC/DC转换器 4A Wide Inp/Neg Out Adj 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: |
| PTN78020AAZT | 功能描述:DC/DC转换器 4A Wide Inp/Neg Out Adj 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: |
| PTN78020H | 制造商:TI 制造商全称:Texas Instruments 功能描述:6-A, WIDE-INPUT ADJUSTABLE SWITCHING REGULATOR |
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