LDS9003 / 9001
?009 IXYS Corp.
16
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
Table 12: Recommended Register Load Sequence for LDS9003/9001
Reg Load
Sequence #
Reg (hex)
Value (hex)
Comments
1*
1Eh
88h (9003) or 00h (9001) Initialize Configuration Register
2*
00h
08h
IPWM1 current @ 1mA
3
01h
08h
IPWM2 current @ 1mA
4
02h
08h
IPWM3 current @ 1mA
5*
03h
A2h (9003) or 02h (9001) Set up Led-sense configuration for 9003 & 9001
6*
04h
00h
Global PWM Dimming 00h is full ON = 100% DC
7*
05h
FBh
Duty Cycle code for IPWM1. Use set FBh=95% DC
8
06h
FBh
Same as reg 05h
9
07h
FBh
Same as reg 05h
10*
49h
00h
Ta-Tj 0ffset
11*
4Ah
1Eh
Set LED Shutdown temperature 1Eh = 120C
12*
4Bh
1Fh
Set optional 2x PWM adjust step start point; 1x
scale below this point
13*
A0h
36h
Load Si Diode K factor for - 1.71mV/C
14*
A2h
User Loads Per LED Used
User loads LED K factor @ 1mA I
F.
4Bh = -2.3mV/C for Luxeon Rebel WLED
15
A4h
User Loads Per LED Used
User loads LED K factor @ 1mA I
F.
for LED1
4Bh = -2.3mV/C for Luxeon Rebel WLED
16
A6h
User Loads Per LED Used User loads LED K factor @ 1mA I
F
for LED2
17*
C0h
40h
Load Si Diode h factor = 1.0
18*
D4h
04h
Load Si Diode Rs = 68 ohms
19*
D6h
User Loads Per LED Used
User loads LED Rs for LED1
0Ah = 1.4 ohms for Luxeon Rebel WLED
20
D8h
User Loads Per LED Used User loads LED Rs for LED2
21
DAh
User Loads Per LED Used User loads LED Rs for LED3
22-47*
50h 5Fh User Loads Per LED Used LUT1 correction Table
48-64
60h 7Fh User Loads Per LED Used LUT2 correction Table
65-80
70h 7Fh User Loads Per LED Used LUT3 correction Table
81*
1Fh
10h
User issues temp calibration command
The advantage of PWM dimming is stable LED color
temperature / wavelength that is determined by the
maximum static mode LED current value set by the
external HB LED driver. The integrated PWM
generator reduces the system requirement to provide
a continuous pulsed waveform, and is automatically
adjusted by the LED-Sense
TM
algorithm to maintain
the programmed Temperature vs PWM DC thermal
control profile.
To use the dynamic PWM mode for LED current
setting, the maximum I
LED
value should first be set by
the HB LED Driver current setting resistor (per
vendor specifications) and the desired dimming / user
duty cycle can be set by registers 05h, 06h, and 07h.
The logarithmic operating mode provides a dimming
resolution of approximately -0.17 dB per step with
0dB dimming (i.e. 100% duty cycle) at the 256
th
step
(i.e. FFh), and 0% duty cycle (~ -80 dB dimming) at
00h.
Figure 8 shows the dimming transfer function for
dimming level in dB (from maximum level) vs
programmed data code (decimal).
Figure 9 shows the dimming transfer function for
dimming level in percent (%) vs programmed data
code (decimal). 0% dimming is full ON brightness
(i.e. PWM duty cycle = 100%).
Register 04h is available as a global dimming control
register. It will simultaneously control all IPWM
generators so is especially helpful in applications
using the LDS9003. It is recommended that the user
use registers 05h, 06h, and 07h to establish the
desired duty cycle at ambient room temperature (i.e
25篊) conditions that account for further LED-
Sense
TM
adjustment over temperature per the
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