BA9700A View Datasheet(PDF) - ROHM Semiconductor

Part Name

Description

Manufacturer

BA9700A

Switching regulator for DC / DC Converters

ROHM Semiconductor 

Regulator ICs

!Timing chart

ERR. AMP

OUTPUT

DEAD - TIME

BA9700A / BA9700AF / BA9700AFV

H

PWM. COMP

OUTPUT

L

OUTPUT TR.

COLLECTOR

H

L

Fig.1

!Application examples

VIN

GND

R9

47k

8

SW1

10

2.57V

11

30k

R1

43k

13

1.29V

30k

14

C1

R2

15k

R3

680p

12

7.5k C2

4

0.047µ

Voltage

Regulator

Vref

ERROR AMP

+

−

C9 1000p

3

R8 15k

2

C8

470µ

Triangle

Oscillator

9 N.C.

6 N.C.

PWM COMPARATOR

5

Q1 2SB1009

L1

120µH

RB100A

R7

560

D1

5V

VOUT

C5, C6

470µF

×2

GND

R6

560

7

1

C4 1µ

+

R4 15k

R5 20k

L1: RCH-875 121K (Sumida Electronics)

Fig.2 Step-down converter

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