[原创] Microchip MCP1633汽车尾灯照明参考设计

Microchip公司的MCP1633高速PWM控制器是电源应用的脉宽调制器,它是基于MCP1632 PWM控制器,但包含了PWM LED调光的特别区块.特别适用于需要低边MOSFET的拓扑如升压,反激,SEPIC,CUK等.MCP1633采用电流模式控制,具有优异的带宽和瞬态响应,以及逐个周期的限流和可调峰值失调.如果需要, MCP1633还可工作在电压模式控制.开关频率可通过外接电阻在200 kHz和2.2 MHz之间设定.输入电压3V 到 5.5V,具有欠压保护,输出过压保护,输出短路保护和超温保护.主要用在LED驱动器,开关电源(SMPS)和砖形DC/DC转换器.本文介绍了MCP1633主要特性,功能框图,多种应用电路以及汽车尾灯参考设计主要特性和技术指标,框图和测试建立图,电路图,材料清单和PCB设计图.

The MCP1633 High Speed PWM Controller is a pulsewidth modulator developed for standalone power supply applications. The MCP1633 design is based on the MCP1632 PWM Controller but includes specific blocks for PWM LED dimming. It is suitable for use in topologies requiring a low side MOSFET, such as Boost, Flyback, SEPIC, CUK, etc.

The MCP1633 uses Current Mode Control to provide superior bandwidth and transient response, and also cycle-by-cycle current limiting with adjustable peak offset. The MCP1633 is also capable of operating in Voltage Mode Control if required.

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