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Macroblock Presents High Voltage Constant
Current LED Driver For LCD Monitor |
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Apr 29, 2009 |
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Hsinchu, Taiwan - Macroblock announced its
newly-developed 8-channel and 4-channel constant current LED
drivers –MBI1828 and MBI1824, for the application of LCD
monitor and high brightness LEDs. Since LED contains no
mercury and provides highly directional light source, it is
suitable for backlighting applications to provide high
brightness. By high voltage process technology, MBI1828 and
MBI1824 are designed to light up cascaded LEDs in single
channel with high luminance. With precise output current
control, MBI1828 and MBI1824 deliver high uniformity of LEDs
with the maximum output current variations between channels
(also called “channel skew”) ±3% and between drivers (also
called “chip skew”) ±6% respectively.
MBI1828 especially features the cooperation with DC/DC
controller by feedback scheme. When this scheme detects that
the minimum voltage in any single channel is lower than the
required value to maintain constant current, it will force
the DC/DC controller to boost the voltage until reaching the
preset value. This design eliminates the difference of LED
forward voltage as well as achieves constant current in each
channel. Besides above feature, MBI1828 provides
open-circuit detection and thermal flag to protect IC from
overheated.
MBI1828 and MBI1824 are both designed with dimming control
by PWM signal to adjust the brightness from 0% to 100%. By
external resistor, MBI1828 and MBI1824 can adjust the
current in each channel from 5mA to 60mA and from 10mA to
120mA respectively.
MBI1828 and MBI1824 are new products in Macroblock All-Ways-OnTM
lighting and backlighting solutions. With output current
ranging from 60mA to 360mA, All-Ways-OnTM series offer a
broad line of applications in general illumination and LCD
backlighting. For more information, please contact:
marketing@mblock.com.tw。
Macroblock All-Ways-OnTM Solution
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Product No. |
Channel |
Max.Output Current in Single Channel
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Sustaining Voltage |
Supply Voltage |
Analog Dimming |
Adjusted Signal
for Constant
current |
PWM Dimming |
Package |
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MBI1801 |
1 |
1.2A |
17V |
5.0V |
- |
－ |
V |
TO265 |
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MBI1802 |
2 |
360mA |
- |
－ |
V |
SOP8 |
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MBI1804 |
4 |
240mA |
- |
－ |
V |
SOP8 |
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MBI1812 |
2 |
360mA |
12V |
V |
－ |
V |
SOP8 |
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MBI1816 |
16 |
60mA |
5.0V |
- |
－ |
V |
TSSOP20 |
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MBI1824 |
4 |
120mA |
50V |
8~40V |
- |
－ |
V |
SOP8 |
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MBI1828 |
8 |
60mA |
- |
V |
V |
TSSOP16/
QFN24 |
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