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A8434 Datasheet(PDF) 5 Page - Allegro MicroSystems

Part No. A8434
Description  6-Channel High Efficiency Charge Pump White LED Driver
Download  11 Pages
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Maker  ALLEGRO [Allegro MicroSystems]
Homepage  http://www.allegromicro.com
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A8434 Datasheet(HTML) 5 Page - Allegro MicroSystems

 
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6-Channel High Efficiency Charge Pump
White LED Driver
A8434
5
Allegro MicroSystems, Inc.
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
www.allegromicro.com
RSET = 6.65 kΩ
RSET =8.87 kΩ
4
6
8
1012141618
30
25
20
15
10
5
RSET (kΩ)
Sub
Main + Sub
Main
100.0
95.0
90.0
85.0
80.0
75.0
70.0
65.0
60.0
55.0
50.0
VIN (V)
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VIN (V)
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
VHI
VLO
0.5
0.6
0.7
0.8
0.9
1.0
1.1
1.2
Sub
Main + Sub
Main
100.0
95.0
90.0
85.0
80.0
75.0
70.0
65.0
60.0
55.0
VIN (V)
2.7
3.1
3.5
3.9
4.3
4.7
5.1
5.5
Logic Level
Dimming on ENM and ENS
Enable Pulses versus Total Current, LED1 through LED6
Performance Characteristics
Tests performed using application circuit shown in figure 2
TA=25°C, VIN=3.6 V (unless otherwise noted)
Symbol
Parameter Units/Division
C1
VENM
0.5 V
C2
ILED16
50 mA
t
time
50 ms
t
C1
C2
ILED1-6
RSET versus LED Current
VENM and VENS
Efficiency versus Supply Voltage
VIN falling, Vf = 3.4 V at 20 mA
Efficiency versus Supply Voltage
VIN falling, Vf = 3.1 V at 10 mA


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