脉宽调制控制器MAX17500

32位 切换 可编程的

MAX17499/MAX17500电流型PWM控制器包含设计宽输入电压隔离和非隔离电源所需的所有控制电路。MAX17499适用于低输入电压(9.5V DC到24V DC)的电源。MAX17500非常适合通用输入(整流85V AC至265V AC)或电信(-36V DC至-72V DC)电源。该集成电路包含一个内部误差放大器，用于调节用于一次侧稳压隔离电源的第三绕组输出电压。一次侧调节消除了对光耦合器的需要。输入欠压锁定(UVLO)是为输入电源启动电压编程，并确保在限电条件下正常运行。一个开放漏极UVLO标志输出，具有210μs的内部延迟，允许次级侧控制器的排序。输入电源启动电压是通过一个分压器从外部编程的。UVLO/EN输入用于关闭设备。内部数字软启动，消除输出电压过冲。 The MAX17500 has an internal bootstrap UVLO with large hysteresis that requires a minimum 23.6V for startup. The MAX17499 does not have the internal bootstrap UVLO and can be biased directly from a minimum voltage of 9.5V. The switching frequency for the ICs is programmable with an external resistor. The MAX17499A/MAX17500A provide a 50% maximum duty-cycle limit, while the MAX17499B/MAX17500B provide a 75% maximum duty-cycle limit. These devices are available in 10-pin µMAX® packages and are rated for operation over the -40°C to +125°C temperature range.