CAT3647 Datasheet, PDF (5/14 Pages) Catalyst Semiconductor – 3-Channel Ultra High Efficiency Quad-Mode™ LED Driver with 32 Dimming Levels

CAT3647
TYPICAL PERFORMANCE CHARACTERISTICS
(V_IN = 3.6 V, I_OUT = 60 mA (3 LEDs at 20 mA), C_IN = C_OUT = C₁ = C₂ = 1 mF, T_AMB = 25°C unless otherwise specified.)
100
V_F = 3.3 V
90
1x
80
1.33x
1.5x
2x
100
V_F = 3.3 V
90
1x
80
1.33x
70
70
60
60
50
40
4.5
4.0
3.5
3.0
2.5
2.0
INPUT VOLTAGE (V)
Figure 3. Efficiency vs. Input Voltage
50
40
4.2 4.0
3.8
3.6
3.4
3.2
3.0
INPUT VOLTAGE (V)
Figure 4. Efficiency vs. Li−Ion Voltage
4
V_F = 3.3 V
3
2
1
LEDs Off
0
5.5 5.0 4.5 4.0 3.5 3.0 2.5 2.0
INPUT VOLTAGE (V)
Figure 5. Quiescent Current vs. Input Voltage
4
3
2x
1.5x
2
1
1.33x
1x
0
−40
0
40
80
120
TEMPERATURE (°C)
Figure 6. Quiescent Current vs. Temperature
10
8 ^VF ^{= 3.3 V}
6
4
2
0
−2
−4
−6
−8
−10
2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
INPUT VOLTAGE (V)
Figure 7. LED Current Change vs. Input
Voltage
10
8 V_F = 3.3 V
6
4
2
0
−2
−4
−6
−8
−10
−40
0
40
80
120
TEMPERATURE (°C)
Figure 8. LED Current Change vs.
Temperature
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