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参数资料
| 型号： | PTB48560AAH |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 电源模块 |
| 英文描述： | 1-OUTPUT 30 W DC-DC REG PWR SUPPLY MODULE |
| 封装： | ROHS COMPLIANT PACKAGE-11 |
| 文件页数： | 6/29页 |
| 文件大小： | 800K |
| 代理商： | PTB48560AAH |
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Input Current Limiting
Thermal Considerations
Using the On/Off Enable Controls on the PTB48560x Auto-Track Compatible DC/DC Converters
Automatic (UVLO) Power Up
Positive Output Enable (Negative Inhibit)
DC/DC
Module
PEN
NEN
2
3
4
1
+VI
VI
+VI
VI
1 = Outputs Off
Q1
BSS138
Negative Output Enable (Positive Inhibit)
PTB48560A, PTB48560B
PTB48560C
SLTS236A–MARCH 2005–REVISED OCTOBER 2005
The converter is not internally fused. For safety and overall system protection, the maximum input current to
the converter must be limited. Active or passive current limiting can be used. Passive current limiting can be a
fast-acting fuse. A 125-V fuse, rated no more than 5 A, is recommended. Active current limiting can be
implemented with a current limited Hot-Swap controller.
Airflow may be necessary to ensure that the module can supply the desired load current in environments with
elevated ambient temperatures. The required airflow rate is determined from the safe operating area (SOA). The
SOA is the area beneath the applicable airflow rate curve on the graph of temperature derating vs output current.
(See the Typical Characteristics.) Operating the converter within the SOA limits ensures that all the internal
components are at or below their stated maximum operating temperatures.
The converter incorporates two output enable controls. PEN (pin 2) is the positive enable input, and NEN (pin 3)
is the negative enable input. Both inputs are electrically referenced to -VI (pin 4) on the primary or input side of
the converter. The enable pins are ideally controlled with an open-collector (or open-drain) discrete transistor.
Each input has an internal pullup resistor to a reference. There is no benefit to adding pullup resistors external to
the module. If they are added, the maximum input voltage for these inputs must be limited to a maximum of 60 V.
Connecting NEN (pin 3) to -VI (pin 4) and leaving PEN (pin 2) open-circuit, configures the converter for automatic
power up. The converter control circuitry incorporates an undervoltage lockout (UVLO) function, which disables
the converter until the minimum specified input voltage is present at ±VI (see the Electrical Characteristics table).
The UVLO circuitry ensures a clean transition during power up and power down, allowing the converter to
tolerate a slow rising input voltage. For most applications, the PEN and NEN enable controls can be configured
for automatic power up.
To configure the converter for a positive enable function, connect NEN (pin 3) to -VI (pin 4), and apply the system
On/Off control signal to PEN (pin 2). In this configuration, applying less than 0.8 V (with respect to -VI potential)
to pin 2 disables the converter output. Figure 15 gives an example circuit that uses a MOSFET transistor.
Figure 15. Positive Enable Configuration
To configure the converter for a negative enable function, PEN (pin 2) is left open circuit, and the system On/Off
control signal is applied to NEN (pin 3). A low-level control signal (less than 0.8 V) must then be applied to pin 3
to enable an output from the converter. An example of this configuration is detailed in Figure 16.
14
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| PTB48560AAZ | 功能描述:DC/DC转换器 30-W 3.6V to 5.5V Adj 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: |
| PTB48560B | 制造商:TI 制造商全称:Texas Instruments 功能描述:30-W, 48-V INPUT DC/DC CONVERTERS WITH AUTO-TRACK TM SEQUENCING |
| PTB48560BAH | 功能描述:DC/DC转换器 30-W 1.8V to 3.6V Adj 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: |
| PTB48560BAS | 功能描述:DC/DC转换器 30-W 1.8V to 3.6V Adj 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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