User`s guide

MCP1630 Boost Mode LED Driver Demo Board User’s Guide

2.3 SETUP PROCEDURES

To operate the demonstration board, you need to complete the following steps:

1. Configure the board for the desired current output level.

2. Attach a LED load to the output terminals.

3. Connect a power supply to the input.

Detailed instructions are provided below for each step.

2.3.1 Demo Board Output Current Configuration

1. Remove jumper J4 for an output current of 350 mA. Install jumper J4 for an

output current of 700 mA.

2.3.2 Connecting the Load

A string of five LEDs mounted on a metal PCB has been provided for use with the demo

board. (See Figure 2-1).

When driven at 350 mA, the total power delivered to the five LEDs will be approximately

5 W. At 700 mA drive, the load power will be approximately 10W. Care must be taken

not to operate the LEDs beyond the maximum junction temperature specified in the

data sheet.

It is recommended that you mount the metal PCB to a heat-sink to allow continuous

operation. A heat-sink can be constructed using a length of 1-inch square aluminum

square tubing. The aluminum square tubing is available at most hardware stores. The

LED PCB can be mounted to the aluminum tubing using machine screws or self-tap-

ping sheet metal screws.

1. Connect the LED PCB to the demo board output terminals (TP1 and TP2) using

test clips (provided). The anode of the LEDs is indicated on the PCB with a '+'

marking and should be connected to the TP1 terminal on the demo board. The

cathode of the LEDs should be connected to the TP2 output terminal on the

demo board.

FIGURE 2-1: LED Load Board.

Note: Do not operate the LEDs for an extended period of time without mounting

the PCB to a suitable heat-sink. Operation beyond the maximum junction

temperature could cause early failure of the LEDs.

Note: Do not connect the TP2 output terminal on the demo board or the cathode

of the LEDs to circuit ground. The TP2 terminal is connected to a current

sensing resistor and is not at ground potential during normal operation.

Damage to the circuit will occur if the TP2 terminal is connected to ground.

+ + + ++

Connector wire

with 'alligator'

clip

D1 D2 D3 D4 D5

Connect to TP2Connect to TP1