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参数资料
| 型号： | LM2742 |
| 厂商： | National Semiconductor Corporation |
| 英文描述： | N-Channel FET Synchronous Buck Regulator Controller for Low Output Voltages |
| 中文描述： | N沟道场效应管同步降压稳压控制器输出电压低 |
| 文件页数： | 9/22页 |
| 文件大小： | 619K |
| 代理商： | LM2742 |
Example Circuits (Continued)
This circuit shows the LM2742 paired with a cost effective
solution to provide the 5V chip power supply, using no extra
components other than the LM78L05 regulator itself. The
input voltage comes from a ’brick’ power supply which does
not regulate the 12V line tightly. Additional, inexpensive 10uF
ceramic capacitors (Cinx and Cox) help isolate devices with
sensitive databands, such as DSL and cable modems, from
switching noise and harmonics.
In situations where low cost is very important, the LM2742
can also be used as an asynchronous controller, as shown in
the above circuit. Although a a schottky diode in place of the
bottom FET will not be as efficient, it will cost much less than
the FET. The 5V at low current needed to run the LM2742
could come from a zener diode or inexpensive regulator,
such as the one shown in Figure 7. Because the LM2742
senses current in the low side MOSFET, the current limit
feature will not function in an asynchronous design. The
ISEN pin should be left open in this case.
20087508
FIGURE 7. 12V Unregulated to 3.3V, 3A, 750kHz
20087509
FIGURE 8. 12V to 5V, 1.8A, 100kHz
LM2742
www.national.com
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LM2742MTC | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2742MTC NOPB | 制造商:Texas Instruments 功能描述:Bulk |
| LM2742MTC/NOPB | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| LM2742MTC/NOPB | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| LM2742MTCX | 功能描述:直流/直流开关转换器 RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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