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MIC3231 Datasheet(PDF) 11 Page - Micrel Semiconductor

Part # MIC3231
Description  Constant Current Boost Controller for Driving High Power LEDs
PDF  19 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC3231 Datasheet(HTML) 11 Page - Micrel Semiconductor

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Micrel, Inc.
MIC3230/1/2
November 2009
11
M9999-113009-B
first 100ns of the current sense signal. See Figure 6.
Eq. (9)
IN
OUT
OUT
RMS
IN
V
eff
I
V
I
×
×
=
_
Eq. (10)
() ()
12
2
_
2
_
_
PP
IN
RMS
IN
AVE
IN
I
I
I
−
=
Eq. (11)
2
_
_
_
PP
IN
AVE
IN
PEAK
IN
I
I
I
+
=
Note: If IIN_PP is small then IIN_AVE nearly equals IIN_RMS
VA
+RSLC–
IS
S
R
Q
0.45V
0.45V
CCOMP
COMP
RCOMP = 10k
VC
PWM Comparator
IADJ
VA = IRAMP × RSLP
Current Limit
Clock
250µa/T
VIN
DRV
L1
D1
VCS
IL
VCS = IL × RCS
RCS
+
–
Ai
Figure 4. Current Sense Circuit (An explanation of the IS pin)
Clock
PWM
VC
VC
VC
IFET
IDIODE
0
0
0
IL
IL_AVE = IIN_AVE
IL_PK = IL_AVE + 1/2 IL_PP
IOUT
T
DT
(1-D)T
IL_PP
IFET_RMS
IL_AVE = IIN_AVE
m1
m2
Figure 5. Current Waveforms



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