AN8018SA 데이터 시트보기 (PDF) - Panasonic Corporation

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AN8018SA

1.8-volt 2-channel step-up, step-down, or inverting DC-DC converter control IC

Panasonic Corporation 

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.)

OSC

FB1

FB2

DT1 and DT2

are omitted

Out1

(Open-collector output)

Out2

(Totem pole output)

Channel 1

Switching transistor

emitter current IE1

Channel 2

Switching transistor

collector current IC2

IE1 + IC2

VIN

SBD

+

IC2

IE1

−

SBD

Figure 4. PWM logic explanation chart

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