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LDS8161/41
the default soft-start ramp mode, or s less than 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 de-
rating and all customer-set parameters remain intact
until the part is reset or powered-down. Additionally,
the user can re-calibrate LDS8161/41 during times
when LED currents are brought to zero and thermally
stabilized by programming the calibration command
bit as discussed.
Factory preset values (upon completion of the power-
up initialization) are as follow (see Table 3):
a) All LEDs are disabled and I LEDA, B, C = 0;
b) WLED mode (i.e. 1 De-rating LUT) selected
and 1 PWM generator drives all 3 banks
(8160) or 2 banks (8141).
c) PWM dimming control is enabled Logarithmic
Mode with reset duty cycle = 0%.
e) Soft start-up PWM ramp feature enabled;
If the factory default loaded de-rating curve is used
as shown in Figure 7, then following Table 10
identifies the necessary registers and initialization
required after the power-up or reset state to operate
the LDS8161/41.
d) LED-Sense
TM
temperature
de-rating
is
Figure 3: LDS8161/41 Default De-rate Curve
disabled with the LUT in Logarithmic Mode
for a Nichia NSSW020BT WLED;
Table 10: Recommended Register Load Sequence for LDS8161/41
(Using the Factory Default De-Rating LUT)
Reg Load
Sequence #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
? 2009 IXYS Corp.
Reg
(hex)
1Eh
49h
4Ah
4Bh
A0h
A2h
C0h
D4h
D6h
1Fh
00h
01h
02h
03h
05h
Value (hex)
00h
CCh
18h
20h
36h
User Loads Per LED Used
40h
04h
User Loads Per LED Used
10h
User Loads Ex: F0h = 30mA
Uer Loads Ex: F0h = 30mA
User Loads Ex: F0h = 30mA
User Loads Ex: 3Fh = all
channels
User Loads Ex: FEh = 91% DC
12
Comments
Initialize Configuration Register
Ta-Tj 0ffset = -20oC
Set LED Shutdown Temp = 85oC (Ta referenced)
Set 2x de-rate mode starting at 55C
Load Si Diode K factor for - 1.71mV/C
User loads LED K factor @ 1mA I F
29h = -1.3mV/C for Nichia NSSW020BT
η
Load Si Diode ? factor = 1.0
Load Si Diode Rs = 68 ohms
User loads LED Rs
61h = 17 ohms for Nichia NSSW020BT
User issues temp calibration command
User sets Current for Bank A.
User sets Current for Bank A.
User sets Current for Bank B.
User enabled LED channels
User sets PWM duty cycle for all channels
Doc. No. 8141/61_DS, Rev. N1.0
Characteristics subject to change without notice
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