LMR14030-Q1 Datasheet, PDF (7/32 Pages) Texas Instruments – SIMPLE SWITCHER 40 V, 3.5A Step-Down Converter

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LMR14030-Q1
SNVSAG3 – NOVEMBER 2015
6.7 Typical Characteristics
Unless otherwise specified the following conditions apply: V_IN = 12 V, f_SW = 500 kHz, L = 5.6 µH, C_OUT = 47 µF x 2, T_A =
25°C.
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
V_OUT = 5 V
0.1
I_OUT (A)
f_SW = 500 kHz
V_IN = 36 V
V_IN = 24 V
V_IN = 12 V
1
10
D002
Figure 1. Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
V_OUT = 3.3 V
0.1
I_OUT (A)
f_SW = 1 MHz
V_IN = 24 V
V_IN = 12 V
V_IN = 5 V
1
10
D009
Figure 3. Efficiency vs. Load Current
0.2
0.15
V_IN = 36 V
V_IN = 24 V
V_IN = 12 V
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
V_OUT = 5 V
0.1
I_OUT (A)
f_SW = 1 MHz
V_IN = 36 V
V_IN = 24 V
V_IN = 12 V
1
10
D003
Figure 2. Efficiency vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
0.001
0.01
V_OUT = 3.3 V
0.1
I_OUT (A)
f_SW = 2.2 MHz
V_IN = 20 V
V_IN = 12 V
V_IN = 5 V
1
10
D010
Figure 4. Efficiency vs. Load Current
125
VFB Falling
VFB Rising
100
0.1
75
0.05
50
0
25
-0.05
0.001
0.01
0.1
1
I_OUT (A)
V_OUT = 5 V
f_SW = 500 kHz
Figure 5. Load Regulation
10
D004
0
0
0.1 0.2 0.3 0.4 0.5 0.6
VFB (V)
V_OUT = 5 V
f_SW = 500 kHz
Figure 6. Frequency vs V_FB
0.7
D005
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