Many applications require the capability to automatically disconnect power from an operating circuit. Such applications include thermal shutdown of high-voltage power supplies in radar and X-ray systems, shutdown to limit inrush current during power-up or hot-swapping of pc cards, and shutdown to ensure that a card is properly seated before power is applied. In general, a power fault system will keep the power off following the system fault, until it is deliberately reset.
Figure 1 is a flexible circuit that limits current or removes power in response to a command from the user or other fault-indicating signal. It accommodates manual-reset (MR), over-temperature, and interlock-switch inputs. U1, for instance, is a circuit-breaker IC designed to offer protection in hot-swap applications. Residing on either the backplane/host side or the removable-card/remote-device side of the backplane connectors, it guards against start-up faults when a card or board is inserted into a rack or host with the main power supply turned on.
Figure 1. This circuit provides general over-current and over-temperature protection.
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器件 | 类型 | 描述 | 数据手册 |
---|---|---|---|
MAX4370 | 热插拔 | 电流调节热插拔控制器,带有DualSpeed/BiLevel故障保护 | 点击下载 |
MAX6816 | 开关去抖器和保护器 | ±15kV ESD保护、单/双/八通道、CMOS开关去抖器 | 点击下载 |
MAX6501 | 传感器 | 低成本、+2.7V至+5.5V、微功耗温度开关,SOT23封装 | 点击下载 |
MAX1615 | MOSFET驱动器和控制器 | 高压、低功耗线性稳压器,用于笔记本电脑 | 点击下载 |
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