LDS8160-002-T2 IXYS, LDS8160-002-T2 Datasheet - Page 15

• Manufacturer Part Number: LDS8160-002-T2
• Description: IC LED DVR WHT/RGB BCKLGT 16WQFN
• Manufacturer: IXYS
• Series: LED-Sense™, Power-Lite™r
• Type: Backlight, White LED, RGB (I²C Interface)r

Specifications of LDS8160-002-T2

• Topology: Linear (LDO), PWM
• Number Of Outputs: 6
• Internal Driver: Yes
• Type - Primary: Backlight
• Type - Secondary: RGB, White LED
• Frequency: 1.2MHz
• Voltage - Supply: 2.3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 16-WQFN, 16-miniQFN
• Operating Temperature: -40°C ~ 85°C
• Current - Output / Channel: 25mA
• Internal Switch(s): Yes
• Efficiency: 80%
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Output: -
• Lead Free Status / Rohs Status: Details
• Other names: LDS8160-002-T2-2

LDS8160
For example, to decrease LED brightness by 50%
(-6dB) at all three LED banks, Global PWM Dimming
data code written in register 04h should be 6/0.17 =
35 (decimal) = 23h (see Figure 6: Global Dimming in
Logarithmic Mode in percent vs. register 04h data
(0% dimming = full LED brightness).
The LDS8160 integrates temperature measurement
and compensation processing to maintain stable LED
brightness across varying ambient temperature and
de-rate power dissipated by LEDs, if the LED die
temperature exceeds a preset value.
Figure 4: Dynamic Mode Dimming in Logarithmic
Mode in percent vs. registers 05h – 07h data
(0% dimming = full LED brightness)
Measured temperatures are encoded into 5-bit
T-codes representing 5
-35 to +120
stored Δ PWM adjustment codes to adjust the
dimming level and therefore average current through
the LEDs. The user loads specific Δ PWM codes into
the LUTs to maintain constant average current and
therefore luminosity over temperature.
© 2009 IXYS Corp.
Characteristics subject to change without notice
Figure 3: Dynamic Mode Dimming in Logarithmic
Mode in dB vs. registers 05h – 07h data
(0dB dimming = full LED brightness)
0
C. The measured T-code addresses
0
C temperature intervals from
15
LUT corrections codes are added/subtracted to/from
the user-set duty cycle/dimming codes (dynamic
and/or global) for the channel to correct LED
brightness.
The LDS8160 integrates a 10-bit ADC and digital
processing
approximately every 2.5 seconds. The proprietary
LED-Sense
LED junction temperatures on the LEDA1, LEDB1,
and LEDC1 driver channels. Additionally an on-chip
silicon temperature sensing diode is also measured
to enhance temperature estimation accuracy.
In normal operation mode, the LDS8160 senses the
LED temperatures from all 3 available channels when
in the default RGB (3 channel) mode, or only from the
LEDA1 channel when used in the WLED (single
channel) mode.
Figure 5: Global Dimming in Logarithmic Mode in
Figure 6: Global Dimming in Logarithmic Mode in
(0dB dimming = full LED brightness)
(0% dimming = full LED brightness)
TM
percent vs. register 04h data
dB vs. register 04h data
to
algorithm allows direct measurement of
determine
Doc. No. 8160_DS, Rev. N1.0
LED
temperatures