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

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
Name
Conditions
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
Min
Typ
Max
Units
0.2
100
ms
0.2
ms
1.5
ms
40
ms
T_HI
EN/DIM
T_LED
LED
Current
Shutdown
T_LO
T_PWRDWN
100%
97% _94%
32 Levels
3% _0%
100%
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 LED CURRENT
Full Scale LED Current [mA]
RSET [kW]
2
37.4
5
14.7
10
7.50
15
4.99
20
3.74
25
3.00
30
2.49
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