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CAT3648
Table 4. RECOMMENDED EN/DIM TIMING
(For 2.4 V ≤ V IN ≤ 5.5 V, over full ambient temperature range ? 40 ° C to +85 ° C.)
Symbol
T LO
Name
EN/DIM program low time
Conditions
Min
0.2
Typ
Max
100
Units
m s
T HI
T PWRDWN
T LED
EN/DIM program high time
EN/DIM low time to shutdown
LED current settling time
0.2
1.5
40
m s
ms
m s
T HI
EN/DIM
T LED
T LO
T PWRDWN
100%
97% 94%
100%
LED
Current
Shutdown
32 Levels
3%
0%
Shutdown
Figure 2. EN/DIM Digital Dimming Timing Diagram
LED Current Setting
The full scale LED current is set by the external resistor
connected between the RSET pin and ground. Table 5 lists
standard resistor values for several LED current settings.
Table 5. RESISTOR RSET AND LE D CURRENT
Full Scale LED Current [mA]
2
5
10
15
20
25
30
RSET [k W ]
37.4
14.7
7.50
4.99
3.74
3.00
2.49
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