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CAT4002A, CAT4004A
Table 3. RECOMMENDED OPERATING CONDITIONS
Parameter
V IN
Ambient Temperature Range
I LED per LED pin
NOTE:
Typical application circuit with external components is shown on page 1.
Rating
2.4 to 5.5
? 40 to +85
0 to 40
Unit
V
° C
mA
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 LED
EN/DIM program high time
LED current settling time
0.2
10
m s
m s
T PWRDWN
EN/DIM low time to shutdown
3
5
ms
T HI
EN/DIM
T LED
T LO
T PWRDWN
LED
Current
Shutdown
100%
97% 94%
32 Levels
3%
0%
100%
Shutdown
Figure 2. CAT400XA EN/DIM Dimming Timing Diagram
LED Current Setting
On the CAT400XA, 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. RSET RESISTOR AND LED CURRENT
Full Scale
LED Current [mA] RSET [k W ]
2 40.2
When the EN/DIM is initially taken high, the CAT400XA
becomes enabled and the LED channel current is set to the
full scale current according to the resistor RSET.
LED current ? 125 x V RSET / RSET
http://onsemi.com
3
5
10
15
20
25
30
40
15.4
7.68
4.99
3.74
3.00
2.49
1.87
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