Datasheet

INPUT VOLTAGE (V)
SWITCHING FREQUENCY (kHz)
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
SWITCHING FREQUENCY
(
kHz)
LOAD CURRENT (mA)
1
2 Ps
20.0V
2 Ps
200 mA
1
3
2 Ps
5.0V
2
2
3
1
10 Ps
20.0V
10 Ps
200 mA
1
3
10 Ps
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
EFFICIENCY (%)
LOAD CURRENT (A)
V
IN
= 15V
V
IN
= 90V V
IN
= 100V
V
IN
= 70V
V
IN
= 50V
V
IN
= 30V
1
50 Ps
20.0V
50 Ps
200 mA
1
3
50 Ps
5.0V
2
2
3
Efficiency Measurements www.ti.com
5 Efficiency Measurements
Start-up Behavior
V
IN
= 50V, V
OUT
= 10V, Load Resistance = 30Ω
CH1: Switch Node Voltage
CH2: Output Voltage
CH3: Inductor Current
Figure 3. LM5008 Efficiency Figure .
Normal Operation Load Transient
V
IN
= 50V, V
OUT
= 10V, Load Resistance = 30Ω V
IN
= 50V, V
OUT
= 10V, Load change from 1kΩ to 20kΩ
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
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