LM78S40
- Step-up, step-down or inverting switching regulators
- Output adjustable from 1.25V to 40V
- Peak currents to 1.5A without external transistors
- Operation from 2.5V to 40V input
- Low standby current drain
- 80 dB line and load regulation
- High gain, high current, independent op amp
- Pulse width modulation with no double pulsing
The LM78S40 is a monolithic regulator subsystem consisting of all the active building blocks necessary for switching regulator systems. The device consists of a temperature compensated voltage reference, a duty-cycle controllable oscillator with an active current limit circuit, an error amplifier, high current, high voltage output switch, a power diode and an uncommitted operational amplifier. The device can drive external NPN or PNP transistors when currents in excess of 1.5A or voltages in excess of 40V are required. The device can be used for step-down, step-up or inverting switching regulators as well as for series pass regulators. It features wide supply voltage range, low standby power dissipation, high efficiency and low drift. It is useful for any stand-alone, low part count switching system and works extremely well in battery operated systems.
技术文档
| 顶层文档 | 类型 | 标题 | 格式选项 | 下载最新的英语版本 | 日期 | |
|---|---|---|---|---|---|---|
| * | 数据表 | LM78S40 Universal Switching Regulator Subsystem 数据表 | 2004-5-10 | |||
| 应用手册 | AN-711 LM78S40 Switching Voltage Regulator Applications (Rev. B) | 2013-5-7 |
设计与开发
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FLYBUCK-FLYBACK-DESIGN-CALC — Flybuck / Flyback Calculator
该工具可帮助电源工程师根据规范选择合适的隔离式 DC-DC 拓扑。根据所选的拓扑，计算器还会针对设计推荐合适的 IC。
| 封装 | 引脚 | CAD 符号、封装和 3D 模型 |
|---|---|---|
| PDIP (NFG) | 16 | Ultra Librarian |