Texas Instruments Evaluation Board for the LM5008 LM5008EVAL/NOPB LM5008EVAL/NOPB Datenbogen
Produktcode
LM5008EVAL/NOPB
INPUT VOLTAGE (V)
SW
IT
C
H
IN
G
F
R
EQ
U
EN
C
Y
(kH
z
)
230
240
250
260
270
220
210
200
0
20
40
60
80
100
120
0
100
200
300
400
500
0
50
100
150
200
250
300
SW
IT
C
H
IN
G
F
R
EQ
U
EN
C
Y
(kH
z
)
LOAD CURRENT (mA)
1
2
P
s
20.0V
2
P
s
200 mA
1
3
2
P
s
5.0V
2
2
3
1
10
P
s
20.0V
10
P
s
200 mA
1
3
10
P
s
5.0V
2
2
3
0.0
0.1
0.2
0.3
0.4
0.5
60
65
70
75
80
85
90
95
EF
F
IC
IEN
C
Y
(%
)
LOAD CURRENT (A)
V
IN
= 15V
V
IN
= 90V
V
IN
= 100V
V
IN
= 70V
V
IN
= 50V
V
IN
= 30V
1
50
P
s
20.0V
50
P
s
200 mA
1
3
50
P
s
5.0V
2
2
3
Efficiency Measurements
5
Efficiency Measurements
Start-up Behavior
V
IN
= 50V, V
OUT
= 10V, Load Resistance = 30
Ω
CH1: Switch Node Voltage
CH2: Output Voltage
CH3: Inductor Current
CH2: Output Voltage
CH3: Inductor Current
Figure 3. LM5008 Efficiency
Figure .
Normal Operation
Load Transient
V
IN
= 50V, V
OUT
= 10V, Load Resistance = 30
Ω
V
IN
= 50V, V
OUT
= 10V, Load change from 1k
Ω
to 20k
Ω
CH1: Switch Node Voltage
CH1: Switch Node Voltage
CH2: Output Voltage
CH2: Output Voltage
CH3: Inductor Current
CH3: Inductor Current
Load Current vs Switching Frequency
Input Voltage vs Switching Frequency
4
AN-1330 LM5008 Evaluation Board
SNVA090B – May 2004 – Revised April 2013
Copyright © 2004–2013, Texas Instruments Incorporated