LM3409MY-NOPB Datasheet, PDF (6/43 Pages) Texas Instruments – PFET Buck Controller for High Power LED Drivers

LM3409, LM3409HV, LM3409-Q1
SNVS602J – MARCH 2009 – REVISED MAY 2013
www.ti.com
Typical Performance Characteristics (continued)
T_A = +25°C, V_IN = 24V, and characteristics are identical for LM3409 and LM3409HV unless otherwise specified.
LM3409 Efficiency vs. Input Voltage
V_O = 10V (3 LEDs); I_LED = 2A ⁽¹⁾
100
LM3409HV Efficiency vs. Input Voltage
V_O = 10V (3 LEDs); I_LED = 2A ⁽²⁾
100
95
95
90
90
85
80
75
70
0
10
20
30
40
50
INPUT VOLTAGE (V)
Figure 9.
85
80
75
70
0
20
40
60
80
300856b3 ^{INPUT VOLTAGE (V)}
Figure 10.
LM3409 LED Current vs. Input Voltage
V_O = 17V (5 LEDs) ⁽³⁾
2.40
LM3409HV LED Current vs. Input Voltage
V_O = 17V (5 LEDs) ⁽⁴⁾
2.5
2.35
2.4
2.30
2.3
2.25
2.2
2.20
2.15
2.1
2.10
20 24 28 32 36 40 44
INPUT VOLTAGE (V)
Figure 11.
2.0
20
32
44
56
68
80
INPUT VOLTAGE (V)
Figure 12.
Normalized Switching Frequency vs. Input Voltage
1.7
Amplitude Dimming Using IADJ Pin
V_O = 17V (5 LEDs); V_IN = 24V
2.3
1.4
1.8
1 LED
1.0
1.4
0.7
3 LEDs
0.3
5 LEDs
0.0
0
14
7 LEDs
28 42 56 70
INPUT VOLTAGE (V)
Figure 13.
0.9
0.5
0.0
0.0 0.3 0.5 0.8 1.0 1.3
V_ADJ (V)
Figure 14.
(1) The measurements were made using the Bill of Materials from Design #3 except the LM3409 was substituted for the LM3409HV.
(2) The measurements were made using the Bill of Materials from Design #3.
(3) The measurements were made using the Bill of Materials from Design #3 except the LM3409 was substituted for the LM3409HV.
(4) The measurements were made using the Bill of Materials from Design #3.
6
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