LM3429_14 Datasheet, PDF (7/50 Pages) Texas Instruments – LM3429Q1 N-Channel Controller for Constant Current LED Drivers

LM3429
www.ti.com
100
95
90
85
80
10
1.00
SNVS616F – APRIL 2009 – REVISED JANUARY 2010
Typical Performance Characteristics
T_A=+25°C and V_IN = 14V unless otherwise specified
Boost Efficiency
Buck-Boost Efficiency
vs.
vs.
Input Voltage
V_O = 32V (9 LEDs)⁽¹⁾
Input Voltage
V_O = 20V (6 LEDs)⁽²⁾
100
95
90
85
80
75
70
15
20
25
30
V_IN (V)
Boost LED Current
vs.
Input Voltage
V_O = 32V (9 LEDs)⁽¹⁾
0
1.05
16
32
48
64
80
V_IN (V)
Buck-boost LED Current
vs.
Input Voltage
V_O = 20V (6 LEDs)⁽²⁾
0.99
1.03
0.98
1.01
0.97
0.99
0.96
5
1.0
0.8
0.6
0.4
0.2
0.0
10
15
20
25
30
V_IN (V)
Analog Dimming
V_O = 20V (6 LEDs)⁽²⁾
0
20
40
60
80 100
I_CSH (éA)
0.97
0
1.0
16
32
48
64
80
V_IN (V)
PWM Dimming
V_O = 20V (6 LEDs)⁽²⁾
0.8
0.6
500 Hz
0.4
100 Hz
0.2
0.0
0
20
40
60
80 100
DUTY CYCLE (%)
(1) The measurements were made using the standard boost evaluation board from AN-1986.
(2) The measurements were made using the standard buck-boost evaluation board from AN-1985.
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