AN8018 Panasonic Semiconductor, AN8018 Datasheet - Page 15

• Manufacturer Part Number: AN8018
• Description: 1.8-volt 2-channel step-up/ step-down/ or inverting DC-DC converter control IC
• Manufacturer: Panasonic Semiconductor

Voltage Regulators
[5] About logic of PWM block
same time, noise can be suppressed to a lower level by staggering the turn on timing.
(pin 1) is lower than both of the FB1 (pin 5) terminal voltage and the DT1 (pin 6) terminal voltage.
(pin 1) is higher than both of the FB2 (pin 13) terminal voltage and the DT2 (pin 12) terminal voltage.
Application Notes (continued)
(Open-collector output)
(Totem pole output)
The logic for channel 1 and channel 2 of this IC is reversed. Thereby an input current flatness is realized. At the
The PWM1 block turns on the output transistor during the period when the triangular wave of the OSC terminal
The PWM2 block turns on the output transistor during the period when the triangular wave of OSC terminal
(Refer to figure 4.)
Channel 1
Switching transistor
emitter current I
Channel 2
Switching transistor
collector current I
I
E1
I
C2
Out2
Out1
FB1
FB2
E1
OSC
C2
V
IN
Figure 4. PWM logic explanation chart
I
E1
I
C2
SBD
SBD
AN8018SA
DT1 and DT2
are omitted
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