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參數(shù)資料
| 型號(hào)： | MB3785A |
| 廠商： | Fujitsu Limited |
| 英文描述： | Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities) |
| 中文描述： | 開關(guān)穩(wěn)壓器控制器（4通道加高精度，高頻率功能） |
| 文件頁(yè)數(shù)： | 25/29頁(yè) |
| 文件大?。?/td> | 293K |
| 代理商： | MB3785A |
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25
MB3785A
(Reference Data)
The phase margin is halved by changing the smoothing capacitor from an aluminum electrolytic capacitor (R
C
=
1.0
) to a small-ESR semiconductor electrolytic capacitor (OS – CON; R
C
= 0.2
). (See Figure 21 and 22.)
Figure 20. DC/DC Converter AV-
φ
Characteristic Measuring Circuit
Figure 21. Gain-Frequency Characteristic
Gain - frequency and phase frequency characteristics of Al electrolytic capacitor (DC/DC converter +5 V output)
Figure 22. Phase-Frequency Characteristic
V
OUT
V
O+
C
NF
FB
V
REF
/2
R
1
R
2
V
IN
AV– characteristic
between this interval
Error amp
+
–
–IN
+IN
V
CC
= 10 V
R
L
= 25
C
P
= 0.1
μ
F
A
V
62
°
60
40
20
0
–20
–4010
100
1 k
10 k
100 k
180
90
0
–90
–180
G
P
Frequency f (Hz)
+
–
V
O+
GND
Al electrolytic capacitor
220
μ
F (16 V)
R
C
1.0
:
F
OSC
= 1 kHz
V
CC
= 10 V
R
L
= 25
C
P
= 0.1
μ
F
27
°
A
V
60
40
20
0
–20
–4010
100
1 k
10 k
100 k
180
90
0
–90
–180
Frequency f (Hz)
G
P
V
O+
GND
+
–
OS – CON
22
μ
F (16 V)
R
C
0.2
:
f
OSC
= 1 kHz
Gain - frequency and phase frequency characteristics of OS – CON (DC/DC converter +5 V output)
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|---|---|
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