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(Continued)
7. Duty - input oscillating frequency characteristic
100
Input waveform
80
60
Duty
Dtr (%)
40
20
0
0
5K 10K
Input oscillating frequency (Hz)
9. Power dissipation - ambient temperature characteristic
1000
800
Power
600
dissipation
P
(mW)
D
400
200
0
-20 020 4060 80 100
Ambient temperature T
V
= 6 V
CC
1.9V
V
= 1.6 V
FB
1.3V
T
= +25 C
A
50K 100K
500K 1M
( C)
A
8.Gain - frequency characteristic and phase - frequency
characteristic
40
20
Gain
(dB)
0
-20
-40
1K
10K
100K
f (Hz)
Circuit for measuring gain - frequency characteristic and
phase - frequency characteristic
2.5 V
2.5 V
4.7 k
4.7 k
10 F
+
-
in
4.7 k
4.7 k
MB3788
T
= +25 C
180
A
90
Phase
(deg)
0
-90
-180
1M
5M 10M
V
= 6 V
CC
240 k
-
out
+
Error amplifier
11
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