MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board User’s Guide
DS20005196A-page 12 2013 Microchip Technology Inc.
1.3 WHAT IS THE MCP1643 SYNCHRONOUS BOOST LED CONSTANT
CURRENT REGULATOR EVALUATION BOARD?
The MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
is used to evaluate and demonstrate Microchip Technology’s MCP1643 device. This
board demonstrates the MCP1643 in a boost converter application supplied by one AA
battery, or from an external voltage source, which drives an LED with four selectable
currents. The MCP1643 Synchronous Boost LED Constant Current Regulator
Evaluation Board was developed to help engineers reduce the product design cycle
time.
Four output currents can be selected: 25,50,75 and 100mA. The output current can be
changed with a dual switch that changes the external LED current sense equivalent
resistance (for the position of the switches and output current see Table 2-1.)
An enable switch is used to enable and disable the converter. When enabled, the
MCP1643 will regulate the output current; when disabled, the MCP1643 disconnects
the path from input to output for “true-disconnect”. In this state, the current consumed
from the battery is 1.2 µA, typically.
1.4 MCP1643 SYNCHRONOUS BOOST LED CONSTANT CURRENT
REGULATOR EVALUATION BOARD KIT CONTENTS
This MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
kit includes the following items:
• MCP1643 Synchronous Boost LED Constant Current Regulator Evaluation Board
(ADM00435)
• Important Information Sheet
