
CAT4002A, CAT4004A
TYPICAL PERFORMANCE CHARACTERISTICS
(CAT4002A, V IN = 4 V, V F = 3.3 V, I OUT = 50 mA (2 LEDs at 25 mA), C IN = 1 m F, T AMB = 25 ° C unless otherwise specified.)
2.0
1.6
1.4
1.2
1.2
1.0
0.8
0.4
0.8
0
0
20
40
60
0.6
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.0
0.8
0.6
0.4
0.2
0
? 0.2
? 0.4
? 0.6
? 0.8
RSET (k W )
Figure 3. Quiescent Current vs. RSET Input
Voltage
10
8
6
4
2
0
? 2
? 4
? 6
? 8
INPUT VOLTAGE (V)
Figure 4. Quiescent Current vs. Input Voltage
(Full Load)
? 1.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
? 10
? 40
0
40
80
120
1.4
1.2
INPUT VOLTAGE (V)
Figure 5. LED Current Change vs. Input
Voltage
40
30
TEMPERATURE ( ° C)
Figure 6. LED Current Change vs.
Temperature
1.0
25 ° C
? 40 ° C
20
0.8
0.6
80 ° C
10
0.4
2.0
2.5
3.0
3.5
4.0
4.5
5.0
5.5
0
1
10
100
INPUT VOLTAGE (V)
Figure 7. EN/DIM High Threshold vs. Input
Voltage
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4
RSET (k W )
Figure 8. LED Current vs. RSET Resistor