Datasheet
Table Of Contents
Installation and Operation
© 2009 Microchip Technology Inc. DS51798A-page 11
2.3.1 Power Input and Output Connection
2.3.1.1 POWERING THE MCP1631HV DIGITALLY PROGRAMMABLE
CURRENT SOURCE REFERENCE DESIGN
1. Prepare the power supply to be connected to the input terminal block, J1. The
input voltage source should be limited to the 0V to +16V range. For nominal
operations, the recommended input voltage should be between +3.5 and +16
volts with a 12W input supply.
2. Connect the positive side of the input source (+) to pin +V
IN
of J1. Connect the
negative or return side (-) of the input source to pin GND of J1. Refer to
Figure 2-4.
FIGURE 2-4: Power Supply and Load Connections Diagram.
2.3.1.2 APPLYING A LOAD TO THE MCP1631HV DIGITALLY CONTROLLED
PROGRAMMABLE CURRENT SOURCE REFERENCE DESIGN
1. To apply an LED load to the MCP1631HV Digitally Controlled Programmable
Current Source Reference Design, the anode of the LED should be connected
to pin 1 (+) of J2. The cathode of the LED should be connected to pin 5 (-) of J2.
The default drive current for LEDs is set to 700 mA in the supplied firmware. The
LED load which is connected to the reference board must be capable of handling
700 mA. If the LED load is not capable of handling 700 mA, then the firmware
must be re-compiled with the LED drive current set to the current capability of the
LED load being used. The minimum programmed current that the board will
generate is 10% of the programmed drive current. For the reference board
firmware which is set to 700 mA of drive current, the minimum would be 70 mA.
2. Optionally, a thermistor referenced to the (-) pin of J2 may be utilized for thermal
shutdown.
The recommended thermistor is EPCOS Inc. P/N: B57500M0103A005.
(+) LED Anode
(-) LED Cathode
(+) THERMISTOR (optional)
GND
+V
IN
(-) THERMISTOR (optional)
Note: The Thermal Shutdown is not enabled by default in the firmware. It can be
enabled by re-compiling the source code with this feature enabled. The
thermistor must be used if the board is programmed with NiMH/NiCd
charger firmware.