- Texas Instraments 48-V to 3.3-V Forward Converter with Active Clamp Reset Model SLUU178A User's Guide

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7 Power Up/Down Test Procedures
81
79
87
83
91
89
93
85
2 6 18 262210 14
I
OUT
- Output Current - A
V
IN
= 36 V
V
IN
= 72 V
V
IN
= 48 V
Percent Efficiency - %
V
OUT
= 3.3 V
f
S
= 300 kHz
OVERALL EFFICIENCY
vs
OUTPUT CURRENT
10
-40
-60
100
1 k 10 k 100 k
0
-20
40
20
60
-120
-180
0
-60
120
60
180
V
IN
= 36 V
I
OUT
= 10 A
g
M
= -8 dB
F
M
= 50°
Gain
Phase
f - Frequency - Hz
Gain - dB
Phase - °
GAIN AND PHASE
vs
FREQUENCY
4
2
10
6
12
8
6 18 26 302210 14
2
I
OUT
- Output Current - A
V
IN
= 36 V
V
IN
= 72 V
V
IN
= 48 V
P
LOSS
- Power Loss - W
V
OUT
= 3.3 V
f
S
= 300 kHz
POWER LOSS
vs
OUTPUT CURRENT
Power Up/Down Test Procedures
Figure 3.
Figure 5.
Figure 4.
Using the UCC2891 Active Clamp Current Mode PWM Controller10 SLUU178A – November 2003 – Revised December 2006
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