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LDS8160
compensation temperature range is from -35 to 120 C.
If Δ PWM codes for the Red LED at 35 C are 0001 (1
step) and at 40 C 0010 (2 steps), register 77h should
starting at 55 C and shutdown at 85 C
limited by power dissipation at 50 C and decreases
Assume that the desired nominal forward current at 25 C
de-rating start at 55 C and shutdown at 85 C
If selected de-rating starts at 50 C, LED current values at
Δ PWM steps for every 5 C temperature increment .
the tables establish 25 C as the zero-reference
value for 25oC. For temperatures above 25 C, the
for temperatures below 25 C the ? PWM code is the
- 2.0 mV/ C for RED LED,
- 1.5 mV/ C for Green LED, and
- 1.3 mV/ C for Blue LED.
rating curve. The user operating point must comply
within the specification in Figure 2.
Figure A1.4: User Chosen Power and De-rating Curve
0 0
The maximum current of ~ 18mA for the Red LED is
0
at higher temperatures in respect to the de-rating
specification of Figure A1.2.
Figure A1.5: LED Current Correction Curves with
0 0
The LED Current vs. Temperature curves are then
mapped to LDS8160 Δ PWM duty cycle codes that
are loaded into each of the three LUTs as 32 4-bit
words. Each word can represent from +7 to -7
0
The Δ PWM codes are loaded into registers 50h –
7Fh as 4-bit two’s complement values (see Table 7
of main LDS8160 datasheet for code allocation).
To maintain correlation to typical LED vendor data,
0
point. Therefore, “0” is the required ? PWM code
0
Δ PWM codes is the delta step change from the 5oC
temperature point lower than the current step, while
0
delta step change from the 5oC temperature higher
then the current step (i.e. closer to 25oC). The
0
Example:
0
0
be loaded with code 0010 0001 (bin) = 21h.
The LDS8160 has three integrated PWM generators
that allow programming of 256 logarithmic steps with
12-bit resolution in the LOG mode. Each PWM step is
~ 0.17 dB from 300uA to 25mA in the 1-x scale mode
and therefore ~ 0.34 dB in the 2-x scale mode.
1-x scale is typically used in the temperature
correction/compensation part of curve (as shown in
Figure 5) A 2-x scale mode is also available to support
the higher de-rating slope requirements
The LOG mode is required for RGB correction.
Linear mode operation and linear mode LUT correction
codes are an option in WLED applications. If Linear
WLED mode is chosen, all PWM related data for
Dynamic Dimming and Temperature Compensation
are entered as linear step codes, where each Δ PWM
step is 1/256 of full brightness (100% Duty Cycle)
In WLED applications where Linear PWM option mode
is chosen, only one PWM generator is active (i.e. the A
or Blue channel). In Linear mode the PWM is 8-bit
linear resolution where each bit represents is 1/256 of
100% duty cycle.
Example: RGB LUT Table Generation
0
is 15 mA at all three LEDs and the forward voltages for
the R , G , B LEDs are ~ 2.1 V , 3.2 V , and 3.2 V ,
respectively (per NSSM038AT-E datasheet).
0
this temperature would be (per the Luminosity
Compensation Curve at Figure 3):
~ 1.2x the nominal value at 25 0 C, i.e. 15 x 1.2 = 18 mA for
Red LED;
~ 1.04X the nominal value at 25 0 C, i.e. 15 x 1.04 = 15.6
mA for Green LED;
~ 1x the nominal value for Blue LED to maintain constant
luminosity over temperature.
Users must also determine the typical forward voltage vs.
Temperature coefficients, or “k” factors, of the LEDs used
@ 1mA of forward current.
For the Nichia NSSM038AT-E these have been
determined as;
0
0
0
Therefore, at 50 0 C, forward voltages are
V F = 2.1V + [-2.0 mV/ 0 C x (50 0 C - 25 0 C)] = 2.05V for Red
? 2009 IXYS Corp.
Characteristics subject to change without notice
25
Doc. No. 8160_DS, Rev. N1.0
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