MIC3223 Datasheet, PDF (14/24 Pages) Micrel Semiconductor – High Power Boost LED Driver with Integrated FET

Micrel, Inc.
Design Procedure for a LED Driver
Symbol
Input
V_IN
I_IN
Output
LEDs
V_F
V_OUT
I_LED
I_PP
Pout
DIM_IN
OVP
System
F_SW
eff
V_DIODE
Parameter
Input Voltage
Input Current
Number of LEDs
Forward Voltage of LED
Output Voltage
LED Current
Required I Ripple
Output Power
PWM Dimming
Output Over Voltage Protection
Switching Frequency
Efficiency
Forward drop of schottky diode
Min
8
5
3.2
16
0.33
0
Nom
12
6
3.5
21
0.35
40
30
1
80
0.5
Table 1. Design example parameters
Max
14
2
7
4.0
28
0.37
10.36
100
Units
V
A
V
V
A
mA
W
%
V
MHz
%
V
MIC3223
January 2010
14
M9999-011510-A