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| 型号： | LDS89001008-T2 |
| 厂商： | IXYS CORP |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封装： | 3 X 2 MM, ROHS COMPLIANT, MO-220, DFN-8 |
| 文件页数： | 1/30页 |
| 文件大小： | 622K |
| 代理商： | LDS89001008-T2 |
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LDS9003 / 9001
2009 IXYS Corp.
1
Doc. No. 9003/9001DS, Rev. N1.0
Characteristics subject to change without notice
High Power LED Temperature and PWM Controller
with LED-Sense
TM In-Situ LED TJ Sensing
FEATURES
High temperature LED current de-rating and
thermal control using the LED-Sense
TM
algorithm that directly monitors LED Tjunction
No external thermal sensor is required
Up to three temperature sensing and control
channels on LDS9003 supports multi-point
thermal monitoring or multi-color LED
applications; LDS9001 is a single channel
Programmable Temp vs. PWM Duty Cycle
profiles (3 for LDS9003; 1 for LDS9001)
Integrated PWM for dimming control of high
brightness (HB) LED Drivers in logarithmic
duty cycle steps from 0% to 100% (~ 0.17 dB /
step)
PWM Dimming Control range of 256:1
I2C compatible serial programming interface
Interfaces to available high side HB LED
drivers and low cost microcontrollers
LDS9003 is available in a small footprint
3 mm x 3 mm
2 16-pin TQFN
LDS9001 is in a 3 x 2 mm2 8-pin DFN
APPLICATIONS
HB LED General Illumination Lighting
Automotive LED Lighting
Architectural LED Lighting
DESCRIPTION
The LDS9003 is a 3-channel and LDS9001 is a 1-
channel LED junction temperature
monitor and
control device intended for use in high power LED
solid state lighting applications. It connects directly to
a LED anode and the PWM input of available high
power HB drivers to real-time adjust LED current to
meet maximum LED temperature. A two wire I
2C
interface allows communication to a local low cost
microcontroller
or
other
remote
host
processor
device.
LDS9003 / 9001 can improve thermal management
of high power LED systems by controlling reliable
LED junction temperature levels to meet maximum
operating lifetimes. In addition, it can reduce cost by
allowing operation at optimal LED current/luminance
levels minimizing the number HB LED lamps per
fixture required to meet illumination targets.
The LDS9003/9001 utilizes the LED-Sense
sensing and control algorithm that directly measures
the LED junction and controls the temperature by
closed loop adjustment of the LED Driver current via
PWM duty cycle corrections.
The control loop real-time adjusts the LED current via
PWM correction codes in user programmed Look up
Tables (LUTs) assigned to each sensing channel.
The user programs desired correction profiles for
every 5C increment from -35C to 120C. A single
sensing channel and correction LUT is available in
the LDS900, whereas three correction profiles are
available
in
LDS9003
to
support
multi-point
temperature sensing or multi-color LED applications.
Integrated PWM generators support dimming and
LED temperature vs. current compensation. The
PWM duty cycle is programmable via the I
2C serial
interface from 0% to 100%. User-programmed 8-bit
codes are converted to 12-bit logarithmic steps of ~
0.17 dB per step. The PWM frequency is ~280 Hz to
minimize noise generation.
The EN logic input functions as a chip enable. A logic
HIGH applied at the EN pin allows the LDS9003 /
LDS9001 to respond to I
2C communications. An
optional external serial interface address pin is
available for use in multi-target applications.
The device operates from 2.5 to 5.5V.
The LDS9001 is available in an 8-lead 3 x 2 mm
2
DFN package. The LDS9003 is in a 16-lead 3 x 3
mm
2 TQFN package.
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