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MIC3263 Datasheet(PDF) 23 Page - Micrel Semiconductor

Part # MIC3263
Description  Six-Channel WLED Driver for Backlighting Applications with Flicker-Free Dimming
PDF  32 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC3263 Datasheet(HTML) 23 Page - Micrel Semiconductor

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Micrel, Inc.
MIC3263
January 2010
23
M9999-012110
r
er
mbol
eter
Minimum
ominal
Maximum
Units
Design P ocedure for a LED Driv
Sy
Param
N
Input
VIN
Input Voltage
8
12
14
V
IIN
Input Current
Output
LEDs
8/Channel
/Channel
8/Channel
Number of LEDs
8
Chs
r of Channels
6
6
Channels
Numbe
6
VF
Forward Voltage of LED
.4
3.6
4.0
V
3
VIO
e Drop at the IO Pin
1.1
1.2
2
Voltag
VOUT
Output Voltage
28
30
34
V
ILED/ch
el
30
30
mA
LED Current/Chann
30
IOUT
0.18
A
POUT
r
6.2
W
Output Powe
DIM IN
PWM Dimming
1
100
%
FDIM
Dimming Frequency (internal)
5
kHz
OVP
Output Over-Voltage Protectio
40
V
n
FSW
Switching Frequency
1
MHz
eff
Efficiency
80
85
%
VDIODE
Forward Drop of Schottky Diode
0.5
V
Design Example
In this example, a boost six-channel LED drive
operating off a 12V input is being de gned. This esign
has been created to drive six channels o
LEDs/channels for a total of 48 LEDs. The LED cu
% minimum
Let R2=150k,
r
si
d
f eight
rrent
will be set at 30mA. One is designing for 80
efficiency at a switching frequency of 1MHz.
For 34V out:
CRV
OUT
CRV
V×R2
1.8V ×150kΩ
R1=
=
= 8.39kΩ
V- V
34V -1.8V
Therefore: VOVP= 2.4* (R2+R2)/R1=45V. 45V is too high,
meaning VCRV has to operate at a higher voltage than
1.8V. The CRV loop will charge the CRV capacitor to the
necessary voltage to regulate.
Let VCRV = 2.2V therefore:
CRV
OUT
CRV
V
× R2
2.2V ×150kΩ
R1=
=
= 10.4kΩ
V- V
34V - 2.2V
Use the closest standard value of 10.5kΩ.
efore:
VOVP = 2.4* (R2+R2)/R1 = 40V
Select RISET for a Given ILED
Ther
ISET
LED
60
60
R=
Ω == 2 Ω
I30mA
k
Use 2kΩ for RISET (R9)



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