MCP1643 RGB LED Driver Demonstration Board User’s Guide

DS50002437A-page 12

 2016 Microchip Technology Inc.

• Shutdown current: 1.2 μA (typical)

• Overtemperature protection (+150°C, with +25°C hysteresis)

• Packages: 8-lead MSOP and 8-lead 2x3 mm DFN

Figure 1-1 illustrates the typical application with one battery.

FIGURE 1-1:

Typical MCP1643 Boost Converter Single Cell Battery Input.

1.4

MCP1643 RGB LED DRIVER DEMONSTRATION BOARD OVERVIEW

The MCP1643 RGB LED Driver Demonstration Board is used to demonstrate

Microchip Technology’s MCP1643 device in a boost converter application supplied by

one AA battery, or from an external voltage source, which drives each color of the RGB

color of the RGB LED at a frequency of 70 Hz. The MCP1643 RGB LED Driver

Demonstration Board was developed to help engineers reduce product design cycle

time.

The intensity of each color of the LED can be adjusted using individual potentiometers

for each color. The RGB LED is driven by a microcontroller with 3 PWM signals, and

by modifying the duty cycle of each signal, the brightness of each color can be altered.

The MCP1643 RGB LED Driver Demonstration Board is controlled using two buttons:

• Start: to enable the MCP1643 and start the microcontroller

• Stop/Demo: to stop or run a demonstration program

When disabled, the MCP1643 disconnects the path from input to output for

true-disconnect. In this state, the current consumed from the battery is typical 1.2 µA.

FIGURE 1-2:

MCP1643 RGB LED Driver Demonstration Board Block Diagram.

GND

4.7 µF

4.7 to10 µF

4.7 µH

SW

LED

4.7



EN

+

-

ON

OFF

MCP1643

0.12V

Power source

1x AA battery

MCP1643

LED driver

RGB

LED

User

input

Controller

Capacitor

PIC16F1455