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ADD5205 Datasheet(PDF) 8 Page - Analog Devices

Part # ADD5205
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

ADD5205 Datasheet(HTML) 8 Page - Analog Devices

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ADD5205
Data Sheet
Rev. 0 | Page 8 of 16
TYPICAL PERFORMANCE CHARACTERISTICS
0
10
20
30
40
50
60
70
80
90
100
05
10
INPUT VOLTAGE (V)
15
20
0
5
10
15
20
25
05
10
INPUT VOLTAGE (V)
15
20
Figure 4. Boost Converter Efficiency vs. Input Voltage,
ILED = 20 mA, Brightness = 100%, and LEDs = 6 Series × 4 Parallel
Figure 7. LED Current vs. Input Voltage (ILED = 22 mA)
0
5
10
15
25
20
30
0
400
800
RSET (kΩ)
1200
1400
200
600
1000
1600
–20
–15
–10
–5
0
5
10
15
20
020
40
PWM INPUT DUTY CYCLE (%)
60
80
100
Figure 8. LED Current Matching vs. PWM Input Duty Cycle
Figure 5. LED Current (ILED) vs. RSET
VIN = 3.7V
BRIGHTNESS = 100%
6 SERIES x 4 PARALLEL
A CH3
960mV
1
2
4
3
VOUT (10V/DIV)
SHDN (3V/DIV)
IL (500mA/DIV)
VSW (10V/DIV)
0
20
18
16
14
12
10
8
6
4
2
0
20
40
PWM INPUT DUTY CYCLE (%)
60
80
100
Figure 6. LED Current vs. PWM Input Duty Cycle
Figure 9. Start-Up Waveforms (Brightness = 100%)



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