Datasheet

www.microchip.com/lighting LED Lighting Solutions Design Guide 5
LED Lighting Solutions
MCP1650 Multiple White LED Demonstration Board
(MCP1650DM-LED2)
The MCP1650 Multiple White LED Demo
Board uses the MCP1650 IC to power the
nine white LEDs which are connected in
series. A PIC10F202 microcontroller in a
SOT-23 6-pin package is used to provide the
PWM signal to the MCP1650. It also accepts
a push button input that allows the user
to adjust the white LEDs to three different
intensities of 100%, 50% and 25%.
Literature on the Web
■
MCP1640/B/C/D Data Sheet, DS22234
■
MCP1650/51/52/53 Data Sheet, DS21876
■
MCP1650 Multiple White LED Demo Board
User’s Guide, DS51586
■
AN948 – Efficiently Powering Nine White LEDs
Using the MCP1650, DS00948
■
AN980 – Designing a Boost-Switching Regulator with
the MCP1650, DS00980
■
DG10 – Power Solutions Design Guide, DS21913
9 LEDs
33V/15 mA
OFF
ON
V BAT
+
-
V IN
FB
GND
NC
EXT
NC
CS
SHDN
MCP1650
Battery Operated Boost LED Driver Example Using the MCP1650
Driving LEDs with a SEPIC Regulator
The Single-Ended Primary Inductance Converter (SEPIC)
regulator topology uses an additional inductor, but provides
the following advantages for battery powered applications:
■
The converter can buck or boost as the input voltage
changes.
■
The circuit topology provides inherent short-circuit
protection due to the use of a coupling capacitor.
MCP1650 3W White LED Demonstration Board
(MCP1650DM-LED1)
Demonstrates the MCP165X Boost Controller
product family in a battery-powered white LED
application with an input voltage range of 2.0V
to 4.5V.
Literature on the Web
■
MCP1650 3W White LED Demo Board User’s Guide,
DS51513
4.5-2.0V
3W
LED
V BAT
+
-
V IN
LBO
GND
FB
EXT
LBI
CS
SHDN
MCP1651
OFF
ON
V BAT
V BAT
Low Battery
Warning
Battery Input to 3.6V 3W LED Driver (SEPIC Converter)