CAT3649 Datasheet, PDF (8/14 Pages) ON Semiconductor – 6-Channel Quad-Mode LED Driver with 32 Dimming Levels & PWM

4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0
0
CAT3649
TYPICAL PERFORMANCE CHARACTERISTICS
(V_IN = 3.6 V, PWM = V_IN, I_OUT = 120 mA (6 LEDs at 20 mA), C_IN = C_OUT = C₁ = C₂ = 1 mF, C_PWM = 47 nF,
T_AMB = 25°C unless otherwise specified.)
30
25 mA
25
20
20 mA
15
10
1x Mode
50
100
150
200
250
300
LOAD CURRENT (mA)
Figure 22. Foldback Current Limit
5
0
0
50
100
150
200
250 300
LED PIN VOLTAGE (mV)
Figure 23. LED Current vs. LED Pin Voltage
Figure 24. Dimming Waveform
Figure 25. 20 kHz PWM Dimming,
10% Duty Cycle
10
200 kHz
1
100 kHz
0
50 kHz
1
10
100
DUTY CYCLE (%)
Figure 26. LED Current vs. PWM Duty Cycles
Figure 27. 1 kHz PWM Duty Cycle Increasing
10% to 50%
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