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MCP1664 LED Driver Evaluation Board

DS50002363A-page 14

 2015 Microchip Technology Inc.

2.3

GETTING STARTED

The MCP1664 LED Driver Evaluation Board is fully assembled and tested to evaluate and

demonstrate the MCP1664 product. This board requires the use of external lab supplies.

2.3.1

Power Input and Output Connection

2.3.1.1

POWERING THE MCP1664 LED DRIVER EVALUATION BOARD

Soldered test points are available for input voltage connections. The maximum input

voltage should not exceed 5.5V.

The MCP1664 LED Driver Evaluation Board was designed to help the engineer in the

process of validating the device. The package selected for the MCP1664 LED Driver

Evaluation Board is the 5-Lead SOT-23.

2.3.1.2

BOARD POWER-UP PROCEDURE:

1. Connect input supply as shown in Figure 2-2.

2. Using the variable resistor, the duty cycle applied on the EN pin is modified and

PWM dimming is obtained. When turning the variable resistor from one side to

the other, a change in the brightness of the LED can be observed.

3. Change the value of the output current using the Current Select Switch. There

are three available currents: 90 mA,180 mA and 270 mA. When modifying the

value of the sense resistor, a change in the brightness of the LED can be noticed.

Additional test points are available for visualizing different signals: SW node, output

current (by removing the R3 resistor and using an ampermeter or a current probe

between the CS and VOUT test points), FB node, the triangular signal or the PWM

signal applied on the EN pin.

FIGURE 2-2:

MCP1664 LED Driver Evaluation Board Setup.

Power

Supply

PWM Dimming Block

Analog

Ampermeter or Current Probe

Dimming

(if R3 resistor is removed)

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