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ADD5207 Datasheet(PDF) 9 Page - Analog Devices

Part # ADD5207
Description  Four-String, White LED Driver
PDF  16 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

ADD5207 Datasheet(HTML) 9 Page - Analog Devices

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



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