Maxim MAX17599 33W隔离降压电源参考设计

Maxim公司的MAX17599是低IQ,宽输入范围,有源钳位电流模式PWM控制器,包含宽输入范围,隔离/非隔离正激转换器设计所需的全部电路，理想用于工业电源设计. MAX17598适合通用输入电源(整流后的85V AC至265V AC)或电信电源(-36V DC至-72V DC)设计.输入电压4.5V-36V, 开关频率100kHz至1MHz,主要用在工业电源,隔离电池充电器,服务器及嵌入式计算和电信及数据通信电源.本文介绍了MAX17599优势和主要特性,框图和应用电路,以及隔离24V/3.3V 33W电源参考设计MAXREFDES121#主要特性,框图,电路图,材料清单和PCB设计图.
The MAX17598/MAX17599 low IQ, active clamp current-mode PWM controllers contain all the control circuitry required for the design of wide-input isolated/non-iso­lated forward-converter industrial power supplies. The MAX17598 is well-suited for universal input (rectified 85V AC to 265V AC) or telecom (36V DC to 72V DC) power supplies. The MAX17599 is optimized for low-voltage industrial supplies (4.5V DC to 36V DC).
The devices include an AUX driver that drives an aux­iliary MOSFET (clamp switch) that helps implement the active-clamp transformer reset topology for forward con­verters. Such a reset topology has several advantages including reduced voltage stress on the switches, trans­former size reduction due to larger allowable flux swing, and improved efficiency due to elimination of dissipative snubber circuitry. Programmable dead time between the AUX and main driver allows for zero voltage switching (ZVS).
The switching frequency is programmable from 100kHz to 1MHz for the devices with an accuracy of Q8% using an external resistor. This allows optimization of the magnetic and filter components, resulting in com­pact, cost-effective isolated/nonisolated power supplies. For EMI-sensitive applications, the ICs incorporate a programmable frequency-dithering scheme, enabling low-EMI spread-spectrum operation.
An input undervoltage lockout (EN/UVLO) is provided for programming input-supply start voltage, and to ensure proper operation during brownout conditions. EN/UVLO in...