7 Performance Curves
Unless otherwise specified the following condition apply: T
A
= 25ºC, I
OUT1
= primary output current, I
OUT2
=
secondary output current.
Output Current (A)
Ef
ficiency (%)
0.015 0.03 0.045 0.06 0.075 0.09 0.105 0.12 0.135 0.15
0
10
20
30
40
50
60
70
80
90
100
48V
60V
80V
Output Current = I
OUT1
= I
OUT2
Figure 7-1. Efficiency
Primary Output Current (A)
Prim
ary Output V
oltage (
V)
Second
ary Output V
oltage (V
)
0
0.05
0.1
0.15
0.2
0.25
0.3
10.156
10
10.1562
10.1
10.1564
10.2
10.1566
10.3
10.1568
10.4
10.157
10.5
Primary Output Voltage
Secondary Output Voltage
I
OUT2
= 0 A
V
IN
= 48 V
Figure 7-2. Load Regulation
Secondary Output Current (A)
Prim
ary Output V
oltage (
V)
Second
ary Output V
oltage (V
)
0
0.05
0.1
0.15
0.2
0.25
10.155
9.2
10.156
9.3
10.157
9.4
10.158
9.5
10.159
9.6
10.16
9.7
10.161
9.8
10.162
9.9
10.163
10
10.164
10.1
10.165
10.2
Primary Output
Secondary Output
I
OUT1
= 0 A
V
IN
= 48 V
Figure 7-3. Load Regulation
20V/div
1µs/div
0
I
OUT
= 0 A
V
IN
= 48 V
Figure 7-4. Typical Switching Waveform
800µs/div
Primary Output
5V/div
Secondary Output
5V/div
Power Good
10V/div
EN, 10V/div
0
0
0
0
V
IN
= 48 V
I
OUT
= I
OUT2
= 100 mA
Figure 7-5. Typical Start-Up Waveform
2ms/div
Primary Output
5V/div
Secondary Output
5V/div
Power Good
10V/div
EN, 10V/div
V
IN
= 48 V
I
OUT
= I
OUT2
= 100 mA
Figure 7-6. Typical Shutdown Waveform
Performance Curves
LM5168FEVM EVM User's Guide
13
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