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  • Digitally Controlled Programmable Current Source

  • Created: Sep 03, 2014

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Summary


The design is a high-speed pulse width modulator that features a programmable switching battery charger combined with a microcontroller for "Intelligent" power system development. It has shutdown mode, which reduces the quiescent current to 2.4 μA.


The MCP1631HV digitally controlled programmable current source reference design is used to drive and dim one or more power LEDs in a series or parallel topology (depending on the LED's capability). The reference design may also be used to charge one to four cell NiMH/NiCd or one to two cell Li-Ion battery packs. The board uses the MCP1631HV high-speed analog PWM controller and PIC16F616 microcontroller to generate the proper dimming ratio for LEDs or charge algorithm for NiMH, NiCd and Li-Ion batteries.


The MCP1631HV digitally controlled programmable current source reference design is used to evaluate Microchip's MCP1631HV in a SEPIC power converter application. Multiple user functions may be selected by recompiling the source code. The board can drive LEDs or charge NiMH, NiCd or Li-Ion batteries with a maximum current of 1A. In charger mode, it provides a constant current charge (Ni-based chemistry) and constant current/constant voltage (Li-Ion based chemistry) with preconditioning, cell temperature monitoring (for Ni-based) and battery pack fault monitoring. In LED Driver mode, it provides a constant user defined current and a 10:1 dimming ratio. The dimming ratio and maximum current can be selected before compiling the source code. The board has LED indicators to provide multiple fault indication.

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