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AN8018SA Datasheet(Fiches technique) 15 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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15
Voltage Regulators
AN8018SA
s Application Notes (continued)
[5] About logic of PWM block
The logic for channel 1 and channel 2 of this IC is reversed. Thereby an input current flatness is realized. At the
same time, noise can be suppressed to a lower level by staggering the turn on timing.
The PWM1 block turns on the output transistor during the period when the triangular wave of the OSC terminal
(pin 1) is lower than both of the FB1 (pin 5) terminal voltage and the DT1 (pin 6) terminal voltage.
The PWM2 block turns on the output transistor during the period when the triangular wave of OSC terminal
(pin 1) is higher than both of the FB2 (pin 13) terminal voltage and the DT2 (pin 12) terminal voltage.
(Refer to figure 4.)
FB1
OSC
FB2
Channel 1
Switching transistor
emitter current IE1
Channel 2
Switching transistor
collector current IC2
IE1 + IC2
Out1
(Open-collector output)
Out2
(Totem pole output)
VIN
IC2
SBD
+
IE1
SBD
Figure 4. PWM logic explanation chart
DT1 and DT2
are omitted




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