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.蒸汽泵零件
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.
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The switching frequency of the MCP1633 can be set by an external
resistor between 200 kHz and 2.2 MHz.
虚拟架子鼓The MCP1633 reference voltage is adjustable by using only one
external resistor.The MCP1633 integrates a current sense amplifier with programmable gain using external resistors.
The MCP1633 can achieve high performance LED dimming by
“freezing” the compensation network and load disconnect capability.
The MCP1633 integrates a high speed comparator with a high
performance error amplifier with a PWM latch to perform the high speed analog Power Supply PWM function.Integrated Undervoltage Lockout,透镜体
Overvoltage protection and Overtemperature Protection make designs using the MCP1633 robust over a range of external conditions.
MCP1633主要特性:
•High Speed Current Mode Pulse-Width Modulator (PWM) Controller •Easy to Interface with PIC® Microcontroller for Implementing High-Performance LED Drivers
•Integrated General Purpose Operational Amplifier that can be Used for Current Sensing
•Internal Oscillator with Adjustable Frequency via External Resistor •External Synchronization Option for the Oscillator
•Internal Slope Compensation Circuit
•Current Sense to VEXT Response < 120 ns Typical
Microchip MCP1633汽车尾灯照明参考设计
•Programmable Current Sense Offset
•Internal Reference Voltage Generator
•Soft Start Capability
•Internal Push-Pull MOSFET Driver with 1A Peak Current Capability
•Internal MOSFET Driver for Dimming/Load Disconnect
•Input Voltage Range: 3V to 5.5V
•Undervoltage Lockout Circuit
•Output Overvoltage Protection
•Output Short Circuit Protection
•Overtemperature Protection
•Small 16-Pin QFN 3 x 3 mm Package
MCP1633应用:
•LED Drivers
•Switch Mode Power Supplies
•Brick DC-DC Converters
图1.MCP1633功能框图
图2.MCP1633典型应用LED 驱动器
图3.MCP1633升压转换器
图4.MCP1633 SEPIC 转换器
图5.MCP1633典型SEPIC 转换器
图6.MCP1633 LED驱动器框图
管路接头
汽车尾灯参考设计
The MCP1633 Automotive Tail Light Reference Design uses a step-up/step-down,switch-mode, DC/DC converter for LED driver applications. The board demonstrates several applications that simulate a tail light. It can be controlled either directly in stand-alone mode or from a phone, tablet or other mobile device by using an Android application. MCP1633 Automotive Tail Light Reference Design features Microchip’s MCP1633 high-speed
htc a310
Pulse-Width Modulator (PWM). The MCP1633 comes in a small 16-pin QFN package and contains all the analog components necessary for a peak
current mode control loop including specialized LED driver blocks. A 28-pin PIC16F15355 microcontroller is used to implement all the functions on the board.
图7. 汽车尾灯参考设计外形图(正面)
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