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ISL97634 bảng dữ liệu(PDF) 4 Page - Intersil Corporation

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ISL97634 bảng dữ liệu(HTML) 4 Page - Intersil Corporation

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4
FN6264.2
April 10, 2007
Typical Performance Curves
FIGURE 1. EFFICIENCY vs PWM DUTY CYCLE
FIGURE 2. QUIESCENT CURRENT vs VIN (PWM/EN = HI)
FIGURE 3. LOAD REGULATION (VIN = 4V)
FIGURE 4. LINE REGULATION
FIGURE 5. DIMMNG LINEARITY (FB VOLTAGE) vs DUTY
CYCLE
FIGURE 6. PWM DIMMING AT 1kHz, D = 1%
50
55
60
65
70
75
80
85
90
0
20
406080
100
PWM DUTY CYCLE (%)
3 LEDs, 10µH
3 LEDs, 22µH
6 LEDs, 10µH
6 LEDs, 22µH
4 LEDs, 10µH
VIN = 4V
RSET = 4
Ω
fPWM = 1kHz
ILED_peak = 25mA
-0.2
0.0
0.2
0.4
0.6
0.8
1.0
024
6
13
5
VIN (V)
19.92
19.96
20.00
20.04
20.08
0
5
10
15
20
25
30
VOUT (V)
19.62
19.64
19.66
19.68
19.70
19.72
19.74
19.76
2.5
3.0
3.5
4.0
4.5
5.0
5.5
VIN (V)
0
10
20
30
40
50
60
70
80
90
100
0
20
40
60
80
100
120
DUTY CYCLE (%)
6 LEDs
VIN = 4V
RSET = 4
Ω
L = 10µH
20kHz
32kHz
1kHz
ILED
PWM/EN
LX
VOUT
VIN = 4V
R1 = 4
Ω
L1 = 22µH
ISL97634


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