Microchip MIC3263 Handleiding

Microchip Niet gecategoriseerd MIC3263

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MIC3263
Six-Channel WLED Driver for
Backlighting Applications with
Flicker-Free Dimming
MLF is a registered trademark of Micrel, Inc.
Micrel Inc. • 2180 Fortune Drive • San Jose, CA 95131 • USA • tel +1 (408) 944-0800 • fax + 1 (408) 474-1000 • http://www.micrel.com
January 2010 M9999-012110
can be set to a
ed to 16
frequency from 400 KHz to 1.8 MHz to a
sizes. The 6V to 40V wide input voltage
allows direct operation from 6V or high
batteries commonly found in notebook compute
range of − °40 C to + °125 C.
Data sheets and support documentation can be found on
Micrel’s web site at: www.micrel.com
General Description
The MIC3263 is a high-efficiency Pulse Width
(PWM) boost switching regulator that is op
constant-current WLED d
Modulation
timized for
lications. river backlighting ap
The MIC3263 drives six channels of up to ten
channel. Each channel is matched in current to
for constant brightness across the screen a
programmed from 15mA to 30mA.
The MIC3263 provides a very flexible dimm
scheme with better accuracy and noise imm
dimming frequency
p
WLEDs per
within ±3%
nd can be
ing control
unity. The
ny value between
100Hz and 20kHz by an external resistor. T
ratio is determined by the duty cycle of a dim
control input signal and can be set to one of 16
he dimming
ming ratio
levels with
a minimum ratio of 1%.The LED dimming curre
an external resistor to allow programming of
between 15mA and 30mA.
The dimming ratio of the MIC3263 is fix
nt is set by
LED current
log levels
to better match the sensitivity of the human e
the dimming levels has hysteresis to avo
between levels and a
ye. Each of
id skipping
llow for high noise immun
The MIC3263 has a programmable PW
ity.
M switching
llow small inductor
range of MIC3263
cell count Li-Ion
r s.
The MIC3263 is available in a low-profile 24-pin 4mm x
4mm MLF® package and has a junction temperature
.
nge
white LEDs
from 15mA to 30mA
ith open and short LEDs
og levels sets the dimming ratio
the jitter from the dimming
control input signal and eliminates dimming flicker
control
rrent matching ±3%
ED current setting ±2%
ing frequency from 400kHz to
High efficiency up to 90%
Low (<40μA) shutdown current over temperature
rature protection
mmable over-voltage protection
° + °C to 125 C junction temperature range
ilable in 24-pin 4mm x 4mm MLF® package
ons
• White LED driver for backlighting
• LCD Panels and Monitors
• Multimedia players
• Navigation equipment
• Gaming systems
• Video poker
• Slot machines
_________________________________________________________________________________________________________________________
Features
• 6V to 40V wide input voltage ra
• Drives 6 channels of up to 10
• Programmable WLED current
• Highly reliable operation w
• Accurate 16 dimming l
from 1% to 100%
• Flicker-Free Dimming filters
• Allows external dimming
LED channel cu• Accurate
• Accurate initial L
• Programmable switch
1.8MHz
•
•
• Over tempe
• Progra
• − 40
• Ava
Applicati
• Notebooks
Micrel, Inc. MIC3263
January 2010 2 M9999-012110
Typical Application
MIC3263 Typical Application Schematic
Micrel, Inc. MIC3263
January 2010 3 M9999-012110
mati
Junction Temperature Range Package Lead Finish
Ordering Infor on
(1)
Part Number
MIC3263YML –40° to +125°C 24-Pin 4mm x 4mm MLF® Pb-Free
Note:
1. Other Voltage available. Contact Micrel for detail
Pin Configuration
24-Pin 4mm x 4mm MLF®
Pin Description
Pin Number Pin Name Pin Function
1 FS
Hz to 1.8MHz.
W Booster Switching Frequency:
Connect a resistor-to-GND to set the switching frequency from 400k
2 RS ent Resistor. LP Slope Compensation Adjustm
3 OV ltage divider virtual ground. PS OVP and FB vo
4 O or amp in the Boost stage. VP Overvoltage Protection Input. This is also the FB voltage for the err
5 MO equency range:
z and VDD for 1.5kHz to 20kHz. If DFS is connected to V
DD, MODE pin is
for an external dimming pulse input.
DE Select a dimming fr
0V for 100Hz to 2kH
used
6 DF Hz through an external resistor and MODE.
Requires a series RC for stability.
If DFS is connected to VDD, an external dimming pulse can be applied to the MODE pin.
S Set a dimming frequency from 100Hz to 20k
7 COMP Loop Compensation connect R and C-to-GND.
8 DRC Dimming Ratio Control Pulse:
Its duty cycle is converted to one of 16 dimming levels. The duty-cycle difference between two
adjacent levels is ±6.25%. And about 2% duty-cycle hysteresis exists between two adjacent
levels to eliminate dimming flicker.
DRC can be from 100Hz to 40kHz.
9 CINT Integration Cap:
Use a 0.01µF for 2kHz to 20kHz and 0.1µF for 100Hz ─ 2kHz.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: MIC3263

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