ISL97634 데이터 시트보기 (PDF) - Intersil
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ISL97634 Datasheet PDF : 10 Pages
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ISL97634
Typical Performance Curves
90
85
80
4 LEDs, 10µH
75
3 LEDs, 10µH
70
3 LEDs, 22µH
65
7 LEDs, 22µH
7 LEDs, 10µH
60
ILED_peak = 25mA
VIN = 4V
55
RSET = 4Ω
fPWM = 1kHz
50
0
20
40
60
80
100
PWM DUTY CYCLE (%)
FIGURE 1. EFFICIENCY vs PWM DUTY CYCLE
1.0
0.8
0.6
0.4
0.2
0.0
-0.2
0
1
2
3
4
5
6
VIN (V)
FIGURE 2. QUIESCENT CURRENT vs VIN (PWM/EN = HI)
20.08
20.04
20.00
19.96
19.92
0
5
10
15
20
25
30
VOUT (V)
FIGURE 3. LOAD REGULATION (VIN = 4V)
100
7 LEDs
90
VIN = 4V
80 RSET = 4Ω
70 L = 10µH
60
50
40
30
20
10
0
0
20
1kHz
20kHz
32kHz
40
60
80
DUTY CYCLE (%)
100
120
FIGURE 5. DIMMNG LINEARITY (FB VOLTAGE) vs DUTY
CYCLE
4
19.76
19.74
19.72
19.70
19.68
19.66
19.64
19.62
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
FIGURE 4. LINE REGULATION
VOUT
LX
VIN = 4V
R1 = 4Ω
L1 = 22µH
PWM/EN
ILED
FIGURE 6. PWM DIMMING AT 1kHz, D = 1%
FN6264.3
March 7, 2008
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