Texas Instruments LM5168FQEVM, User Manual

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7 Performance Curves
Unless otherwise specified the following condition apply: T
A
= 25ºC, I
OUT1
= Primary output current, I
OUT2
=
Secondary output current. Please note that for EVMs labeled as LM5168FQEVM , that the LM5168F is installed
and approximately one half of the load current is available from this device. Both EVMs are identical, except for
the converter IC installed.
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
V
IN
= 48 V I
OUT
= 0 A
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 Shut-down Waveform
www.ti.com Performance Curves
SNVU757 – JUNE 2021
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LM5169FQEVM EVM User Guide 13
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