ADD5207 Просмотр технического описания (PDF) - Analog Devices
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ADD5207 Datasheet PDF : 16 Pages
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Data Sheet
TYPICAL PERFORMANCE CHARACTERISTICS
ILED = 20mA
90
fSW = 800kHz
BRIGHTNESS = 100%
LEDs = 10 SERIES × 4 PARALLEL
88
86
84
82
80
78
5
10
15
20
INPUT VOLTAGE (V)
Figure 4. Boost Converter Efficiency vs. Input Voltage
ADD5207
25
20
15
10
5
0
5
10
15
20
INPUT VOLTAGE (V)
Figure 7. LED Current vs. Input Voltage (ILED = 20 mA)
28
26
24
22
20
18
16
14
12
10
8
6
4
135 150 165 180 195 210 225 240 255 270
RSET (kΩ)
Figure 5. LED Current vs. RSET
20
15
10
5
0
PWM DUTY CYCLE (%)
Figure 6. LED Current vs. PWM Input Duty Cycle
1.5 BRIGHTNESS = 100%
LEDs = 10 SERIES × 4 PARALLEL
1.2 ILED = 20mA
0.9
0.6
0.3
0
–0.3
–0.6
–0.9
–1.2
–1.5
6
8
10
12
14
16
18
20
22
INPUT VOLTAGE (V)
Figure 8. LED Current Matching vs. Input Voltage
0V
0V
0V
0A
VIN = 12V
BRIGHTNESS = 100%
LEDs = 10 SERIES × 4 PARALLEL
5ms/DIV
VOUT
20V/DIV
VSW
20V/DIV
SHDN
5V/DIV
IL
600mA/DIV
Figure 9. Start-Up Waveforms (Brightness = 100%)
Rev. A | Page 9 of 16
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