Maxim MAX17499电流模式PWM电源控制方案

Maxim公司的MAX17499是电流模式PWM控制器,包含了宽输入电压绝缘和非绝缘电源所需的所有电路.输入电压9.5V DC 到24V DC,通用输入电压(85VAC-265VAC)整流或-36V到-72VDC的通信电压.可编程开关频率高达625kHz,主要用在1/2,1/4和1/8砖电源模块,高效绝缘通信电源,网络/服务器,12V升压和SEPIC稳压器, 绝缘和非绝缘HB LED,工业电源等.本文介绍了MAX17499主要特性,方框图, 次级调整和初级调整的电源等多种电源电路图.

The MAX17499/MAX17500 current-mode PWM controllers contain all the control circuitry required for the design of wide-input-voltage isolated and nonisolated power supplies. The MAX17499 is well suited for low input voltage (9.5V DC to 24V DC) power supplies. The MAX17500 is well suited for universal input (rectified 85V AC to 265V AC) or telecom (-36V DC to -72V DC) power supplies.

The ICs contain an internal error amplifier that regulates the tertiary winding output voltage that is used in primary-side-regulated isolated power supplies. Primary-side regulation eliminates the need for an optocoupler. An input undervoltage lockout (UVLO) is provided for programming the input-supply start voltage and to ensure proper operation during brownout conditions. An opendrain UVLO flag output, with 210μs internal delay,allows the sequencing of a secondary-side controller.
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