FAN5616 Datasheet, PDF (7/14 Pages) Fairchild Semiconductor – High-Efficiency, Constant-Current LED Driver with Adaptive Charge Pump

Typical Performance Characteristics (Continued)
Unless otherwise noted, V_IN = 3.6V, T_A = 25°C, C_IN = 4.7µF, C_OUT = 1µF, CAP1 = CAP2 = 0.1µF, FAN5616 driving three
LEDs with V_F = 3.5V at 20mA.
LED Current vs. PWM Frequency
11.0
I_LED = 20mA
10.5 ^{Duty Cycle = 50%}
10.0
9.5
9.0
V_IN = 3.6V
V_IN = 5.5V
8.5
V_IN = 2.7V
8.0
7.5
7.0
0
10
20
30
40
PWM Frequency (kHz)
LED Current Waveform at Highest F_PWM
EN1 &
EN2
I_LED
High
Low
20mA
0mA
50
V_EN1 =
V_EN2
V_OUT
Soft-Start Response
I_LED
200µs/div
3.6V
0V
4V
0V
PWM
Signal
V_OUT
20mA
LED
0mA ^Current
Smart Soft-Start Response
4V
0V
20mA
0mA
7
FAN5616 Rev. 1.0.0
www.fairchildsemi.com