[原创] Microchip MCP1633低边PWM控制器解决方案

Microchip公司的MCP1633是高速PWM控制器,是基于MCP1632 PWM控制器而设计,但增加了特别区块用来PWM LED调光.适合于需要低边MOSFET的拓扑如升压,反激,SEPIC,CUK等.MCP1633采用电流模式控制,提供优异的带宽和瞬态响应,同时逐个周期电流限制和可调峰值失调.如果需要,也可工作在电压模式控制.MCP1633由外接电阻设定,在200kHz和2.2MHz之间.它的基准电压由单个外接电阻来调整.MCP1633集成了电流检测放大器,采用外接电阻可编程增益.采用”冷冻”补偿网络和负载断开可以得到高性能LED调光.MCP1633还集成带有高性能误差放大器的高速比较器和PWM闩锁,以进行高速模拟电源PWM功能.此外还集成欠压锁住,过压保护和超温保护,使得采用MCP1633健壮的设计适应范围更广泛.工作电压3V到5.5V,主要用在LED驱动器,开关闭电源和砖形DC/DC转换器. 中电网为您整理如下详细资料，本文介绍了MCP1633主要特性,框图, LED驱动器应用电路图,SEPIC转换器电路图和SEPICLED驱动器演示板主要特性,电路图,材料清单和PCB设计图.

The MCP1633 High Speed PWM Controller is a pulsewidthmodulator developed for standalone powersupply applications. The MCP1633 design is based onthe MCP1632 PWM Controller but includes specificblocks for PWM LED dimming. It is suitable for use intopologies requiring a low side MOSFET, such asBoost, Flyback, SEPIC, CUK, etc.

The MCP1633 uses Current Mode Control to providesuperior bandwidth and transient response, and alsocycle-by-cycle current limiting with adjustable peakoffset. The MCP1633 is also capable of operating inVoltage Mode Control if required.

The switching frequency of the MCP1633 can be set byan external resistor between 200 kHz and 2.2 MHz.
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