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| 型号： | LDS8160-002-T2 |
| 厂商： | IXYS |
| 文件页数： | 24/39页 |
| 文件大小： | 0K |
| 描述： | IC LED DVR WHT/RGB BCKLGT 16WQFN |
| 标准包装： | 1 |
| 系列： | LED-Sense™, PowerLite™ |
| 拓扑： | 线性（LDO），PWM |
| 输出数： | 6 |
| 内部驱动器： | 是 |
| 类型 - 主要： | 背光 |
| 类型 - 次要： | RGB，白色 LED |
| 频率： | 1.2MHz |
| 电源电压： | 2.3 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-WFQFN 裸露焊盘 |
| 供应商设备封装： | 16-TQFN |
| 包装： | 标准包装 |
| 工作温度： | -40°C ~ 85°C |
| 其它名称： | LDS8160-002-T2-6 |
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LDS8160
Appendix 1
CREATING LUT CORRECTION TABLES FOR LDS8160
LED luminosity (or brightness) is proportional to
forward current through the device and is
dependent on temperature. To maintain a constant
level of luminosity, the forward current should be
adjusted vs. temperature. However, changing the
static forward current also shifts the chromaticity of
the LED, where each white or color LED has a
different dependency with temperature.
The LDS8160 uses Dynamic Dimming control to
change average LED current while maintaining the
peak current thereby causing no color shift. The
LED-Sense
TM
temperature and color correction
algorithm implements this current compensation
feature by adjustment of the PWM duty cycles vs.
the LEDs temperature. The LEDs’ and an internal
chip diode’s I-V characteristics are routinely
measured, digitized, and m apped to ΔPWM code
adjustments stored in three integrated Luminosity
vs. Temperature (LUT) lookup tables. Each LUT is
assigned to one LED bank with two LED current
drivers each. By default, banks A, B, and C are
assigned to Blue, Green, and Red LEDs
Figure A1.2: Total power (combined R, G, and B
diodes) de-rating curve
(NSSM038AT-E RGB LED from Nichia
Assuming that compensation should maintain Relative
Luminosity = 1 in full range of temperatures, the
Compensation curve should be an inversion of the
Luminosity vs. Temperature curve shown at Figure 1
(see Figure A1-3).
current at 25 C. Than the maximum current operating
respectively. Additionally, the same LUTs can be
used to insure current or power de-rating curve vs.
temperature.
Figure A1.1 shows an actual Luminosity vs.
Temperature curve of the NSSM038AT-E RGB LED
available from Nichia Corp.
Figure A1.3: Relative Luminosity Compensation Curve
(inverse Luminosity vs. Temperature curve)
NSSM038AT-E RGB LED from Nichia
This characteristic must be fitted to the chosen nominal
0
chosen as the nominal current at 25 C, and a
Figure A1.1: Luminosity vs. Temperature curve
(NSSM038AT-E RGB LED from Nichia)
Figure A1.2 shows the total power (combined R, G,
and B diodes) specification and de-rating for this
RGB LED.
point is established and it must comply with the
specified temperature de-rating curves for the LEDs.
Figure A1.5 represents LED Current vs. Temperature
curve created for NSSM038AT-E RGB LED with 15ma
0
maximum power for the RGB LED of ~ 133mW as
depicted in Figure A1.4 showing the user-selected de-
? 2009 IXYS Corp.
Characteristics subject to change without notice
24
Doc. No. 8160_DS, Rev. N1.0
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