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CAT3643
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
Name
Conditions
Min
Typ
Max
Units
T SETUP
EN/DIM setup from shutdown
10
m s
T LO
T HI
T PWRDWN
T LED
EN/DIM program low time
EN/DIM program high time
EN/DIM low time to shutdown
LED current settling time
T SETUP
T HI
0.2
0.2
1.5
40
T PWRDWN
100
m s
m s
ms
m s
EN/DIM
T LED
100%
T LO
100%
LED
Current
Shutdown
50%
25%
12.5% 6.25%
3.12%
Shutdown
Figure 3. EN/DIM Digital Dimming Timing Diagram
LED Current Setting
The nominal 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 LED CURRENT
LED Current (mA)
2
5
10
15
20
25
30
RSET (k W )
40.0
15.8
7.87
5.23
4.02
3.16
2.67
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