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參數資料
| 型號： | LDS89001008-T2 |
| 廠商： | IXYS CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING CONTROLLER, PDSO8 |
| 封裝： | 3 X 2 MM, ROHS COMPLIANT, MO-220, DFN-8 |
| 文件頁數： | 7/30頁 |
| 文件大小： | 622K |
| 代理商： | LDS89001008-T2 |
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LDS9003 / 9001
2009 IXYS Corp.
15
Doc. No. 9003/9001_DS, Rev. N1.0
Characteristics subject to change without notice
can re-enable the channels by re-writing to the
channel enable bits in register 03h, however the OT
flag will still remain HIGH, until the device is power
sequenced, reset, or placed in the shutdown mode.
If a Ta-Tj offset is used other than 00h (i.e. 0C) in
register,
49h,
than
the
shutdown
junction
temperature loaded in 4Ah should also include this
offset. This insures the LED shutdown is also properly
referenced to the same reference temperature level
IXYS can provide customers with software support to
generate the LUT data tables. In addition, a separate
applications report can be obtained. Please consult a
sales representative or the factory to obtain.
Table 11: PWM LUT Register Load Example
LUT1
LUT2
LUT3
Address (hex)
Data (hex)
Address (hex)
Data (hex)
Address (hex)
Data (hex)
50
00
60
00
70
00
51
0F
61
0F
71
0F
52
00
62
00
72
00
53
0F
63
0F
73
0F
54
00
64
00
74
00
55
0F
65
0F
75
0F
56
00
66
00
76
00
57
10
67
10
77
10
58
01
68
01
78
01
59
00
69
00
79
00
5A
01
6A
01
7A
01
5B
EF
6B
EF
7B
EF
5C
BD
6C
BD
7C
BD
5D
AA
6D
AA
78D
AA
5E
9B
6E
9B
7E
9B
5F
09
6F
09
7F
09
Recommended User Register Initialization
Table 12 is provided as a recommended user I
2C
register initialization and calibration sequence for the
LDS9003 and LDS9001 respectively. Register load
(i.e. write) steps marked with “*” mean LDS9001
steps, as well as LDS9003. Data value entries in
RED indicate the data value is user / system
dependent. Values shown for these registers are for
example only.
IPWM Current Setting & Interface
IPWMx Current setting registers 00h – 02h should
be programmed to 08h using the I
2C interface to set
the peak DC level current for the IPWM current
source(s). This sets for 1mA ±5% DC current, and
the LDS9003 LED-Sense
TM configuration code 2Ah,
or 02h for LDS9001, should be programmed using
register 03h during initialization.
IPWMx are current source outputs. Users must
connect an external resistor to GND from each
output to establish the peak to peak PWM voltage
level required by the HB LED driver. This is depicted
in Figure 7.
Figure 7: Setting up PWM Voltage Level to HB LED
Driver
Digital dimming using the internal PWM generator
changes the duty cycle per the value set in registers
05h, 06h, and 07h and therefore adjusts the average
LED current. This is referred to as dynamic mode.
For dynamic mode, the LDS9003/9001 integrates a
digital PWM generator(s) that operates at a frequency
of ~ 285 Hz. It operates in Logarithmic Mode. The
PWM generator has 12-bit resolution and can be
programmed with an 8-bit code to provide 256
internally mapped 12-bit logarithmic duty cycle steps
to adjust the dimming level
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