CAT3648_14 Datasheet, PDF (11/13 Pages) ON Semiconductor – 4-Channel Ultra High Efficiency LED Driver

CAT3648
LED Current Selection
After power−up, the LED current is set by the external
resistor (R_SET) value and the number of pulses (n) on the
EN/DIM input as follows:
ǒ Ǔ _{LED current + 125}
0.6 V
R_SET
31 * n
31
The full scale current is calculated from the above formula
with n equal to zero.
The EN/DIM pin has two primary functions. One function
enables and disables the device. The other function is LED
current dimming with 32 different levels by pulsing the input
signal, as shown on Figure 25. On each consecutive pulse
rising edge, the LED current is decreased by about 3.2%
(1/31^th of the full scale value). After 30 pulses, the LED
current is 3.2% of the full scale current. On the 31^st pulse, the
current drops to zero, and then goes back to full scale on the
following pulse.
Each pulse width should be between 200 ns and 100 ms.
Pulses faster than the minimum T_LO may be ignored and
filtered by the device. Pulses longer than the maximum T_LO
may shutdown the device. By pulsing the EN/DIM signal at
high frequency, the LED current can quickly be set to zero.
The LED driver enters a “zero current” shutdown mode if
EN/DIM is held low for 1.5 ms or more.
The dimming level is set by the number of pulses on the
EN/DIM after the power−up, as shown in Table 7.
T_HI
EN/DIM
Table 7. DIMMING LEVELS
Full Scale Current in %
100
97
94
90
87
84
81
77
74
71
68
65
61
58
55
52
48
45
42
39
35
32
29
26
23
19
16
13
10
6
3
0
100
Dimming Pulses [n]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
T_LED
LED
Current
Shutdown
T_LO
100%
97% _94%
32 Levels
3% _0%
100%
T_PWRDWN
Shutdown
Figure 25. EN/DIM Digital Dimming Timing Diagram
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