ISL97691
Typical Performance Curves
92
4P5S
90
90
88
4P7S
85
80
4P5S
4P7S
86
84
82
80
78
75
70
65
60
55
76
2.8
3.3
3.8 4.3
4.8
50
0
20
40 60
80
100
INPUT VOLTAGE (V)
FIGURE 3. EFFICIENCY vs V IN (I CH = 20mA, f DIM = 200Hz,
V OUT = 21V, LEDs = 4P7S)
20
18
PWM DIMMING (%)
FIGURE 4. EFFICIENCY vs PWM DIMMING (V IN = 3.7V, I CH = 20mA,
f DIM = 200Hz, V OUT = 21V, LEDs = 4P7S)
2.00
1.50
16
1.00
14
12
10
8
0.50
0.00
-0.50
6
-1.00
4
2
-1.50
0
0
20
40 60
80
100
-2.00
0
1
2 3
4
5
PWM DIMMING (%)
FIGURE 5. PWM DIMMING LINEARITY (V IN = 3.7V, f DIM = 200Hz,
V OUT = 21V, LEDs = 4P7S)
I_L
V_OUT
V_LX
V_CH
FIGURE 7. START-UP (100% DIRECT PWM DIMMING, V IN = 3.7V,
I CH = 20mA, f DIM = 200Hz, LEDs = 4P7S)
8
CHANNEL NO
FIGURE 6. CHANNEL MATCHING ACCURACY (V IN = 3.7V,
I CH = 20mA, V OUT = 21V, LEDs = 4P7S)
I_L
V_OUT
V_LX
V_CH
FIGURE 8. START-UP (50% DIRECT PWM DIMMING, V IN = 3.7V,
I CH = 20mA, f DIM = 200Hz, LEDs = 4P7S)
FN7840.1
February 1, 2013
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