User manual

80
82
84
86
88
90
92
94
96
1 2 3 4 5 6 7
V
LED
(V)
2A
4A
6A
8A
EFFICIENCY (%)
0
10
20
30
40
50
60
70
80
90
100
0.2 0.4 0.6 0.8 1 1.2 1.4 1.6
ADJ VOLTAGE (V)
V
SENSE
(mV)
84
86
88
90
92
94
96
1 2 3 4 5 6 7
V
LED
(V)
2A
4A
6A
8A
EFFICIENCY (%)
87
88
89
90
91
92
93
94
95
96
97
1 2 3 4 5 6 7
2A
4A
6A
8A
V
LED
(V)
EFFICIENCY (%)
www.ti.com Typical Performance Characteristics
7 Typical Performance Characteristics
Figure 1. Efficiency vs. LED Forward Voltage Figure 2. Efficiency vs. LED Forward Voltage
(V
CGND
- V
EE
= 9V) (V
CGND
- V
EE
= 12V)
Figure 3. Efficiency vs. LED Forward Voltage Figure 4. V
SENSE
vs. V
ADJ
(V
CGND
- V
EE
= 14V)
ILED = 6A nominal, VIN = 3.3V, VEE = -12V Top trace: DIM input, 2V/div, DC Bottom trace: ILED, 2A/div, DC T = 10µs/div
Figure 5. 30kHz PWM Dimming Waveform Showing Inductor Ripple Current
5
SNVA431B–March 2010–Revised May 2013 AN-2041 LM3434 20A Evaluation Board
Submit Documentation Feedback
Copyright © 2010–2013, Texas Instruments Incorporated