Texas Instruments UCC2891 - Manual (Page 11)

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t − Time − 2.5 µ s/div
V
IN
= 36 V
I
OUT
= 30 A
500 mV/div
1 V peak-to-peak
Input Ripple Voltage
10
-40
-60
100 1 k 10 k 100 k
0
-20
40
20
60
-120
-180
0
-60
120
60
180
V
IN
= 48 V
I
OUT
= 10 A
g
M
= -10 dB
F
M
= 50°
Gain
Phase
f - Frequency - Hz
G
a
in
-
d
B
P
h
a
s
e
-
°
GAIN AND PHASE
vs
FREQUENCY
t − Time − 2.5 µ s/div
V
IN
= 72 V
I
OUT
= 30 A
50 mV/div
36 mV peak-to-peak
Output Ripple Voltage
10
-40
-60
100 1 k 10 k 100 k
0
-20
40
20
60
-120
-180
0
-60
120
60
180
V
IN
= 72 V
I
OUT
= 10 A
g
M
= -9 dB
F
M
= 50°
Gain
Phase
f - Frequency - Hz
G
a
in
-
d
B
P
h
a
s
e
-
°
GAIN AND PHASE
vs
FREQUENCY
Power Up/Down Test Procedures
Figure 8.
Figure 6.
Figure 9.
Figure 7.
SLUU178A – November 2003 – Revised December 2006 Using the UCC2891 Active Clamp Current Mode PWM Controller 11
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