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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： | 5/30页 |
| 文件大小： | 622K |
| 代理商： | LDS89001008-T2 |
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LDS9003 / 9001
2009 IXYS Corp.
13
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
10 ms with the soft-start ramp mode disabled by
setting bit 1 of the Configuration Register (1Eh)
HIGH.
The calibration parameters for the temperature
measurement
engine
and
all
customer-set
parameters remain intact until the part is reset or
powered-down.
Additionally,
the
user
can
re-
calibrate LDS9003 / 9001 during times when LED
currents are brought to zero and the system is
thermally stabilized by programming the calibration
command bit as discussed.
Temperature vs PWM Duty Cycle Profiles
The user must load the PWM correction look up
tables (LUTs) prior to operation. For the LDS9003 all
three tables, LUT1, LUT2 and LUT3 require loading
(even if using same data) with the user correction
profiles prior to
operation.
The LDS9001
just
requires loading of LUT1.
The correction tables are based upon LED vendor
characteristics for illumination vs temperature and
current, LED current de-rating specifications, and
user
system
thermal
design
parameters.
The
following figures show examples for Luxeon Rebel
WLEDs,
Figure 3: Typical Light Output vs Temperature
for Luxeon Rebel 3W WLED
Figure
3
shows
the
typical
characteristic
of
decreasing
illumination
over
temperature
by
approximately 30% from -20C to 100C.
Figure 4 shows that illumination is approximately
linearly
dependent
with
LED
forward
current.
Therefore loss of illumination over temperature can
be compensated by associated increases in LED
current.
Figure 4: Typical Light Output vs LED Current for
Luxeon Rebel WLED
Figure 5 gives the LED current de-rating specification
for a Luxeon Rebel WLED for 700mA LED current that
insures not exceeding the maximum specified LED
junction temperature of 150C. This specific curve is
for thermal resistance,
JC, from LED junction to case
designed for 12.5C/W.
Figure 5: Typical LED Current De-rating vs Case
Temperature for Luxeon Rebel WLED
It is customary for LED lighting systems to be
designed with guard-bands to the operating level to
account for design variations in the actual thermal
profile and to maximize operating lifetimes. A user
may target a lower maximum junction temperature
than the absolute maximum rating specified by the
LED vendor, such as 125C, for example, as well as
reducing the LED operating current=
The lower Tj guard-band will shift the curve to the
right, extending maximum lifetime, but the lower
operating current guard-banding results in more
LEDs lamps per fixture to meet the desired lumen
output level.
LED Current vs Temperature (case)
12.5 C/W J-C
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