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| MIC3263 Datasheet, PDF (6/32 Pages) Micrel Semiconductor – Six-Channel WLED Driver for Backlighting Applications with Flicker-Free Dimming | |||
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Micrel, Inc.
MIC3263
Electrical Characteristics(4) (Continued)
VIN = 12V; L = 22μH, COUT =10μF,TA = 25°C, BOLD values indicate â40°C⤠TA ⤠+125°C, unless noted.
Symbol
Parameter
Condition
Min
FDIMA
PWM Dimming Frequency FDIM = 100Hz to 2kHz; MODE = 0
â20
Accuracy
FDIM = 1.6kHz to 20kHz; MODE = VDD
â20
FDRC
DRC Input Range
0.1
VPWM
DRC Pin Thresholds
Turn on
1.3
Turn off
VEN
EN Pin Thresholds
Turn on
1.3
Turn off
IEN
Enable Pin Current
Boost Converter
DMAX
Maximum Duty Cycle
90
ISW
Switch Current Limit
VIN = 6V to 20V, Guaranteed by Design
1.6
VSW
Equivalent Switch VCE(ON) VIN = 12V, ISW = 1.0A
I SW
Switch Leakage Current
VIN = 0V, VIN = 40V
N
Efficiency
VIN = 12V, Load = 6 Channels of 8 LEDs at 20mA
with 3.6V per LED, Frequency = 400kHz
FSW
Oscillator Frequency
Frequency Setting Range
0.4
Range
fSW
Oscillator Frequency
RFSW = 160kâ¦
0.96
VOVP
Overvoltage Protection
Comparators OVP Pin to 2.36V
TSD
Thermal Shutdown
Temperature Rising
Hysteresis
Typ
0
0
40
2.4
0.3
0.01
90
1.2
1.2
2.36
160
20
Max
+20
+20
40
0.4
0.4
60
20
1.8
1.44
Units
%
kHz
V
V
μA
%
A
V
μA
%
MHz
MHz
V
°C
January 2010
6
M9999-012110
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