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CAT3647HV3-GT2 Datasheet(PDF) 11 Page - ON Semiconductor

Part # CAT3647HV3-GT2
Description  3-Channel Ultra High Efficiency Quad-Mode LED Driver with 32 Dimming Levels
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT3647HV3-GT2 Datasheet(HTML) 11 Page - ON Semiconductor

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11
LED Current Selection
After power-up, the LED current is set by the external
resistor (RSET) value and the number of pulses (n) on the
EN/DIM input as follows:
LED current + 125
0.6 V
RSET
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%
(1/31th of the full scale value). After 30 pulses, the LED
current is 3.2% of the full scale current. On the 31st 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 TLO may be ignored and
filtered by the device. Pulses longer than the maximum TLO
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.
Table 7. DIMMING LEVELS
Full Scale Current in %
Dimming Pulses [n]
100
0
97
1
94
2
90
3
87
4
84
5
81
6
77
7
74
8
71
9
68
10
65
11
61
12
58
13
55
14
52
15
48
16
45
17
42
18
39
19
35
20
32
21
29
22
26
23
23
24
19
25
16
26
13
27
10
28
6
29
3
30
0
31
100
32
Figure 25. EN/DIM Digital Dimming Timing Diagram
100%
EN/DIM
LED
Current
Shutdown
Shutdown
97% 93%
3%
0%
100%
32 Levels
TLED
TLO
THI
TPWRDWN


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