Maxim MAX15157D 60V电流模式降压转换器解决方案

Maxim公司的MAX15157D是MAX15157B HV降压控制器系列的升级产品,实现了单相,PWM谷电流模式控制器和驱动两个降压配置的外接功率MOSFET.输出电压通过1V到2.2V基准输入(REFIN)动态设定,从而支持模块化设计.开关频率通过外接电阻确定了内部振荡器,或同步稳压器到外接时钟来进行控制.器件支持60kHz到1MHz开关频率.控制器具有专用的欠压锁住引脚(UVLO)和精确的使能输入阈值,用来加电次序的灵活配置.控制器有多种故障保护电路,通过ILIM引脚调整,以保护过流(OCP),以及输出过压(OVP),输入欠压(UVLO)和热关断.MAX15157D的宽工作电压降低了开发时间,输入电压范围8V到60V,输出电压范围从3V到0.95xVIN,交替的1/2/3/4/6/8相工作,工作温度-40到+125C,内部的LDO用来产生偏压电源.无损耗RDSON或电阻电流检测,小型5mm × 5mm 32引脚TQFN封装.主要用在数据中心,工业,汽车电子和多相降压器.本文介绍了MAX15157D主要优势和特性,框图和典型应用电路图, 多相内部互连图以及评估板MAX15157D EVK主要特性和优势,电路图,材料清单和PCB设计图.

 The MAX15157D is the evolution of the MAX15157B HV buck controller family. The MAX15157D implements a single-phase, PWM valley current-mode controller and drives two external power MOSFETs in a buck configuration. The output voltage can be dynamically set through the 1V to 2.2V reference input (REFIN) for modular design support.

The switching frequency is controlled either through external resistor that sets the internal oscillator, or by synchronizing the regulator to an external clock. The device is designed to support 60kHz to 1MHz switching frequencies. The controller has a dedicated undervoltage lockout pin (UVLO) and an accurate enable input threshold for flexible power sequence configuration. The controller also has multiple fault-protection circuits to protect against overcurrent (OCP) adjustable through the ILIM pin, output overvoltage (OVP), input undervoltage (UVLO), and thermal shutdown.

The MAX15157D features an adjustable internal compensation ramp. The device incorporates an accurate current-sense amplifier that reports output current through an analog output (IMON).