參數(shù)資料
型號(hào): AN8018SA
廠商: PANASONIC CORP
元件分類: 穩(wěn)壓器
英文描述: 1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC
中文描述: 0.05 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝: 0.225 INCH, 0.65 MM PITCH, PLASTIC, SSOP-16
文件頁(yè)數(shù): 20/26頁(yè)
文件大?。?/td> 268K
代理商: AN8018SA
20
AN8018SA
Voltage Regulators
I
Application Notes (continued)
[9] About sequential operation (continued)
V
1
V
2
DT1
Out1
DT2
Out2
Out1 operation
Out2 operation
Operation when each channel single on/off
[10] Error amplifier phase-compensation setting method
The equivalent circuit of error amplifier is as shown in figure 11.
The transfer function is:
H
=
1 / {S (C
E1
+
C
O1
)}
R
E1
+
1 / {S (C
E1
+
C
O1
)}
The cut-off frequency is variable by changing the externally attached phase compensation capacitor C
O1
.
Adjust by inserting a resistor R
O1
between the FB1 terminal and C
O1
in series as shown in figure 12 when it is
required to have a gain on the high frequency side or desired to lead a phase.
The transfer function is:
=
1
SC
O1
· R
E1
+
1
(from C
E1
<<
C
O1
)
H
=
SC
O1
· R
O1
+
1
SC
O1
(R
O1
+
R
E1
)
+
1 (from C
E1
<<
C
O1
)
To PWM
1.19 V
C
O1
57dB
IN
1
C
5 pF
Figure 11. Error amplifier equivalent circuit
F
R
E1
1 M
To PWM
1.19 V
C
O1
R
O1
57dB
IN
1
C
5 pF
Figure 12. Error amplifier equivalent circuit (R
O1
inserted)
F
R
E1
1 M
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