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| 型号： | PTMA403033A2AD |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 10 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT, DIP-5 |
| 文件页数： | 2/35页 |
| 文件大小： | 1867K |
| 代理商： | PTMA403033A2AD |
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APPLICATION INFORMATION
Operating Features and System Considerations for the PTMA40XX DC/DC Converters
Primary-Secondary Isolation
Undervoltage Lockout
Output Overvoltage Clamp
Overcurrent Protection
Soft-Start Power Up
SLTS259B – FEBRUARY 2006 – REVISED MAY 2007
These converters incorporate electrical isolation between the input terminals (primary) and the output terminals
(secondary). All converters are tested to a withstand voltage of 1500 Vdc. This complies with UL/cUL 60950 and
EN 60950 and the requirements for functional isolation. It allows the converter to be configured for either a
positive or negative input voltage source. The data sheet Terminal Functions table provides guidance as to the
correct reference that must be used for the external control signals.
The undervoltage lockout (UVLO) is designed to prevent the operation of the converter until the input voltage is
close to the minimum operating voltage. The converter is held off when the input voltage is below the UVLO
threshold, and turns on when the input voltage rises above the threshold. This prevents high start-up current
during normal power up of the converter, and minimizes the current drain from the input source during low input
voltage conditions. The converter meets full specifications when the minimum specified input voltage is reached.
The UVLO circuitry also overrides the operation of the enable or synchronization controls. Only when the input
voltage is above the UVLO threshold does this input become functional.
The module is protected from an overvoltage on the output using an internal clamp. This protects against a
break in the feedback path as well as a ground fault on the external Trim resistor, which would cause the output
voltage to increase.
To protect against load faults, these converters incorporate output overcurrent protection. Applying a load to the
output that exceeds the converter overcurrent threshold (see applicable specification) causes the output voltage
to momentarily fold back, and then shut down. Following shutdown, the module periodically attempts to
automatically recover by initiating a soft-start power up. This is often described as a hiccup mode of operation,
whereby the module continues in the cycle of successive shutdown and power up until the load fault is removed.
Once the fault is removed, the converter automatically recovers and returns to normal operation.
When the converter is first powered, the internal soft-start circuit limits how fast the output voltage can rise. The
soft-start circuit functions after a valid input source is applied and the output is enabled, after the converter
output is enabled using the Enable input, or on a recovery from a load fault. The purpose of the soft-start feature
is to limit the surge of current drawn from the input source when the converter begins to operate. By limiting the
rate at which the output voltage rises, the magnitude of current required to charge up the load circuit
capacitance is significantly reduced.
Figure 13 shows the power-up characteristic of a PTMA403033 converter. The output voltage is 3.3 V. The
soft-start circuit causes a slow, soft rise of the output voltage. The output voltage will begin to rise after a time
delay (typically 85 ms-100 ms) once a valid input voltage is applied. The output then progressively rises to the
voltage set-point. The waveforms were recorded with a resistive load of 3 A.
10
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| PTMA403033A2AS | 功能描述:DC/DC转换器 10W 36V-75Vin 1500V Iso DC-DC Converter 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: |
| PTMA403033A2AST | 功能描述:DC/DC转换器 10W 36V-75Vin 1500V Iso DC-DC Converter 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: |
| PTMA403033A2AZ | 功能描述:DC/DC转换器 10W 36V-75Vin 1500V Iso DC-DC Converter 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: |
| PTMA403033A2AZT | 功能描述:DC/DC转换器 10W 36V-75Vin 1500V Iso DC-DC Converter 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: |
| PTMA403033A3AD | 功能描述:DC/DC转换器 10W 36V-75Vin 1500V Iso DC-DC Converter 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: |
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