參數(shù)資料
型號(hào)： MB3785APFV
廠(chǎng)商： FUJITSU LTD
元件分類(lèi)： 穩(wěn)壓器
英文描述： Switching Regulator Controller (4 Channels plus High-Precision, High-Frequency Capabilities)
中文描述： 0.03 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQFP48
封裝： PLASTIC, LQFP-48
文件頁(yè)數(shù)： 24/29頁(yè)
文件大?。?/td> 293K
代理商： MB3785APFV
24
MB3785A
I
EQUIVALENT SERIES RESISTOR AND STABILITY OF SMOOTHING CAPACITOR
The equivalent series resistance (ESR) of a smoothing capacitor in a DC/DC converter greatly affects the phase
characteristics of the loop depending on its value.
System stability is improved by ESR because it causes the phase to lead that of the ideal capacitor in high-frequency
regions. (See Figures 17 and 19.) Conversely, if a low-ESR smoothing capacitor is used, system stability deterio-
rates. Therefore, use of a low-ESR semiconductor electrolytic capacitors (OS – CON) or tantalum capacitors calls
for careful attention.
Figure 17. Basic Circuit of Stepdown DC/DC Converter
Figure 18. Gain-Frequency Characteristic
Figure 19. Phase-Frequency Characteristic
Tr
L
C
V
IN
R
C
R
L
D
20
0
–20
–40
–60
10
100
1 k
10 k
100 k
G
Frequency f (Hz)
(2)
(1) : R
C
= 0
(2) : R
C
= 31 m
(1)
0
–90
–180
10
100
1 k
10 k
100 k
P
Frequency f (Hz)
(1) : R
C
= 0
(2) : R
C
= 31 m
(2)
(1)
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