AN8049 データシートの表示（PDF） - Panasonic Corporation

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AN8049

1.8-volt 3-channel step-up, step-down, and polarity inverting DC-DC converter control IC

Panasonic Corporation 

AN8049SH

I Block Diagram

Voltage Regulators

Error

amplifier 1

20 kΩ

Reference voltage

supply VREF 1.26 V

(Allowance: ±1%)

1.26 V

S.C.P.

FB3

IN+3

IN−3

DT3

CTL3

1.26 V

1

20

Error

18 amplifier 2

19

2

5

Error

amplifier 3

VCC

1.1 µA

S.C.P. comp.

0.9 V

VREF

U.V.L.O.

R

S

Q

Latch

1.26 V

1.1 µA

20 kΩ

1.26 V

1.26 V

1.1 µA

1.26 V

Sawtooth wave generator

0.7 V

0.3 V

On/off VCC

control 11

RB1

55 kΩ

12

OUT1

PWM1

PWM3

15

OUT3

PWM2

VREF

45 kΩ

55 kΩ

VCC

10

RB2

13

OUT2

14

GND

I Pin Descriptions

Pin No. Symbol

Description

Pin No. Symbol

Description

1

S.C.P. Connection for the capacitor that

12

OUT1 OUT1 block push-pull output

provides the short-circuit protection

circuit time constant

13

OUT2 OUT2 block push-pull output

2

DT3 Channel 3 soft start setting

14

GND Ground

3

DT2 Channel 2 soft start setting

4

DT1 Channel 1 soft start setting

5

CTL3 Channel 3 on/off control

15

OUT3 OUT3 block open-collector output

16

VCC Supply voltage

17

OSC Oscillator circuit timing resistor and

capacitor connection

6

CTL2 Channel 2 on/off control

18

IN+3 Error amplifier 3 noninverting input

7

CTL1 Channel 1 on/off control

19

IN−3 Error amplifier 3 inverting input

8

Off On/off control

20

FB3 Error amplifier 3 output

9

VREF Reference voltage output

21

IN−2 Error amplifier 2 inverting input

10

RB2 Connection for the OUT2 block

22

FB2 Error amplifier 2 output

output source current setting resistor

11

RB1 Connection for the OUT1 block

23

IN−1 Error amplifier 1 inverting input

output source current setting resistor 24

FB1 Error amplifier 1 output

2

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