1.1.3 BBS6: MCP1664 LED Driver Sub-Module Power-up Procedure

For the power-up procedure, follow these steps:

1. Connect the power supply to the input terminals of the BBS6: MCP1664 LED Driver (see Figure 1-3). The input voltage should be lower than the combined forward voltage of the LEDs (for more information, refer to Table 1-1). The driver can supply up to 8 white series-connected LEDs (or any other type of LED strings with a combined forward voltage below 25V).
2. Connect the Anode (+) of the LED string to the L+ terminal of the board and the Cathode (-) of the LED string to the L- terminal of the board (see Figure 1-3). The maximum load varies with the input and output voltage (refer to the MCP1664 Data Sheet for more information on the maximum load). By default, the DIM terminal (EN pin) is pulled high through a resistor. By applying a low-voltage rectangular signal to this pin, the light intensity of the LED string can be adjusted. For further details, please refer to the MCP1664 Data Sheet.
3. Before turning on the power supply, an ammeter can be connected in series with the LED string to monitor the output current. The measured output current should be 100 mA (±10 mA). Adjusting the input voltage should not cause the output current to vary more than a few mA over the operating range of the converter.