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说明

MCP1643是一款紧凑、高效、固定频率、同步升压的LED驱动器，具有恒定电流，由一节和两节碱性电池和镍氢/镍镉电池供电。该设备还可以驱动两个红色/绿色/黄色串联连接指示灯。

特性

• 1.6A Typical Peak Input Current Limit
• Up to 550 mA LED Load Current
• Low Start-up Voltage: 0.65V (typical, 25 mA LED Current)
• Low Operating Input Voltage: down to 0.5V
• Maximum Input Voltage < VLED<5.0V
• Maximum Output Voltage: 5.0V
• Overvoltage Protection
• Low Reference Voltage: VFB= 120 mV
• Pulse-Width Modulation Mode Operation (1 MHz)
• Internal Synchronous Rectifier
• Internal Compensation
• Inrush Current Limiting
• Internal Soft-Start (240 µs typical)
• Shutdown (EN = GND): True Load Disconnect
• Dimming Control by Variable Duty Cycle
• Shutdown Current: 1.2 µA (typical)
• Overtemperature protection
• Packages:MSOP-8, 2x3 DFN-8

参数