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LT3486 Datasheet(PDF) 16 Page - Linear Technology

Part # LT3486
Description  Dual 1.3A White LED Step-Up Converters with Wide Dimming
PDF  20 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3486 Datasheet(HTML) 16 Page - Linear Technology

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LT3486
16
3486f
3486 TA05A
3V TO 5V
COUT1
2.2
µF
COUT2
2.2
µF
25mA
PWM2
100Hz
8.06
Ω
8.06
Ω
25mA
OFF ON
D1
Q1
5V
100k
100k
2.8k
2.8k
63.4k
Q2
D2
CIN
10
µF
L1
10
µH
L2
10
µH
VIN
VIN
4.7nF
4.7nF
8 LEDs
8 LEDs
COUT1, COUT2: 35V, X5R OR X7R
CIN: 10V, X5R OR X7R
CREF
0.1
µF
VC1
VC2
RT
SW1
SW2
VIN
LT3486
OVP2
CTRL2
REF
PWM2
FB2
OVP1
CTRL1
SHDN
PWM1
FB1
PWM1
100Hz
D1, D2: ZETEX ZLLS400
L1, L2: TOKO D53LC (TYPE A)
Q1, Q2: FAIRCHILD 2N7002
1 Li-Ion Cell to 8/8 White LEDs
PWM DUTY CYCLE (%)
0
75
80
85
80
3486 TA05b
70
65
20
40
60
100
60
55
50
25
30
35
20
15
10
5
0
VIN = 3.6V
8/8 LEDs
EFFICIENCY
LED CURRENT
LED Current and Efficiency vs PWM Duty Cycle
Wide (250:1) Dimming Range
(LED Current 0.1mA to 25mA)
IL
200mA/DIV
LED CURRENT
20mA/DIV
PWM
5V/DIV
2ms/DIV
3486 TA05c
VIN = 3.6V
CTRL1 = 3.6V
8 LEDs/25mA
PWM FREQ = 100Hz
DUTY CYCLE (%)
0.1
10
100
1
10
100
3486 TA05d
1
0.10
0.01
VIN = 3.6V
8/8 LEDs
PWM FREQ = 100Hz
PWM Dimming Waveforms
TYPICAL APPLICATIO S



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