MCP1650DM-LED2 Microchip Technology, MCP1650DM-LED2 Datasheet - Page 14
![BOARD DEMO FOR MCP1650 WHITE LED](/photos/9/16/91652/mcp1650dm-led2_sml.jpg)
MCP1650DM-LED2
Manufacturer Part Number
MCP1650DM-LED2
Description
BOARD DEMO FOR MCP1650 WHITE LED
Manufacturer
Microchip Technology
Datasheets
1.MCP1650S-EMS.pdf
(28 pages)
2.MCP1650DM-LED2.pdf
(24 pages)
3.MCP9700T-ELT.pdf
(36 pages)
Specifications of MCP1650DM-LED2
Current - Output / Channel
15mA
Outputs And Type
1, Non-Isolated
Voltage - Output
32.4V
Features
Dimmable
Voltage - Input
2.7 ~ 4.5V
Utilized Ic / Part
MCP1650
Core Chip
MCP1650
Topology
Boost
Output Current
560mA
No. Of Outputs
1
Input Voltage
2.7V To 5.5V
Kit Contents
Board
Development Tool Type
Hardware - Eval/Demo Board
Rohs Compliant
Yes
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant
MCP1650 Multiple White LED Demo Board User’s Guide
DS51586A-page 10
The equation for the energy flowing into the inductor is given below. The power in the inductor is
equal to the inductor energy times the switching frequency (F
The peak inductor current is:
Using a standard inductor value of 4.7 µH, the power in the inductor is calculated.
There is a second operating point that needs to be addressed when V
duty cycle is 56%.
For both operating points, the inductor power is close to the necessary maximum input
power, forcing the converter to operate in Continuous Current mode. Therefore, a
4.7 µH inductor is too large and the peak input current needs to be increased. A 3.3 µH
inductor is selected.
Now that the inductor energy is greater than the maximum required input energy, the
converter will operate in Discontinuous Current mode.
Energy (2.7V) = 0.880 µ-Joules
Energy (3.8V) = 0.854 µ-Joules
Energy (2.7V) = 1.256 µ-Joules
Energy (3.8V) = 1.219 µ-Joules
Power (2.7V) = 0.66W
Power (3.8V) = 0.640W
Power (2.8V) = 0.942W
Power (3.8V) = 0.914W
I
I
I
I
PK
PK
PK
PK
(2.7V) = 0.612A
(3.8V) = 0.603A
(2.7V) = 0.872A
(3.8V) = 0.859A
T
T
T
ON
ON
ON
= (1/F
= (1/F
= (1/F
SW
SW
SW
) * Duty Cycle
) * Duty Cycle
) * Duty Cycle
Power
Energy
P
P
P
I
PK
IN
IN
IN
=
=
=
=
=
=
----------------------- -
Efficiency
0.486w
-----------------
0.608 watts
Energy F
V
--------
1
-- -
2
80%
L
IN
P
OUT
L I
T
ON
PK
SW
2
SW
).
© 2005 Microchip Technology Inc.
IN
is 3.8V and the