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LM3424 Scheda tecnica(PDF) 9 Page - Texas Instruments

Il numero della parte LM3424
Spiegazioni elettronici  Constant Current N-Channel Controller with Thermal Foldback for Driving LEDs
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM3424 Scheda tecnica(HTML) 9 Page - Texas Instruments

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ICSH (éA)
1.0
0.8
0.6
0.4
0.2
0.0
0
20
40
60
80
100
DUTY CYCLE (%)
25 kHz
1 kHz
100
80
60
40
20
0
0.8
0.2
0.4
0.6
0.8
1.0
VIN (V)
1.010
1.005
1.000
0.995
0.990
5
10
15
20
25
30
VIN (V)
1.02
1.01
1.00
0.99
0.98
0
16
32
48
64
80
VIN (V)
100
95
90
85
80
10
15
20
25
30
VIN (V)
100
95
90
85
80
75
70
0
16
32
48
64
80
LM3424
www.ti.com
SNVS603B – AUGUST 2009 – REVISED OCTOBER 2009
Typical Performance Characteristics
TA=+25°C and VIN = 14V unless otherwise specified
Boost Efficiency
Buck-Boost Efficiency
vs.
vs.
Input Voltage
Input Voltage
VO = 32V (9 LEDs)
(1)
VO = 21V (6 LEDs)
(2)
Boost LED Current
Buck-Boost LED Current
vs.
vs.
Input Voltage
Input Voltage
VO = 32V (9 LEDs)
(1)
VO = 21V (6 LEDs)
(2)
Analog Dimming
PWM Dimming
VO = 21V (6 LEDs); VIN = 24V
(2)
VO = 32V (9 LEDs); VIN = 24V
(1)
(1)
The measurements were made using the standard boost evaluation board from AN-1969.
(2)
The measurements were made using the standard buck-boost evaluation board from AN-1967.
Copyright © 2009, Texas Instruments Incorporated
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