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AN8018SA Datasheet(Fiches technique) 20 Page - Panasonic Semiconductor

Numéro de pièce AN8018SA
Description  1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC
Télécharger  26 Pages
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Fabricant  PANASONIC [Panasonic Semiconductor]
Site Internet  http://www.panasonic.com/industrial/
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20
AN8018SA
Voltage Regulators
s Application Notes (continued)
[9] About sequential operation (continued)
V1
V2
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 (CE1 + CO1)}
=
1
RE1 + 1 / {S (CE1 + CO1)}
SCO1 · RE1 + 1
(from CE1 << CO1)
The cut-off frequency is variable by changing the externally attached phase compensation capacitor CO1 .
Adjust by inserting a resistor RO1 between the FB1 terminal and CO1 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:
H
=
SCO1 · RO1 + 1
SCO1 (RO1 + RE1) + 1 (from CE1 << CO1)
To PWM
1.19 V
CO1
57dB
IN
−1
CE1
5 pF
Figure 11. Error amplifier equivalent circuit
RE1
1 M
To PWM
1.19 V
CO1
RO1
57dB
IN
−1
CE1
5 pF
Figure 12. Error amplifier equivalent circuit (RO1 inserted)
RE1
1 M




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