3/4

REV. B

〇Package Dimensions

〇Pin Description

〇Block Diagram

Lot No.

BD9898FV

BD9898F

SOP28 (Unit:mm)

１

SSOP-B28 (Unit:mm)

Device Mark

１

PIN No.

PIN NAME

FUNCTION

1PGND

Ground for FET drivers

2LN2

NMOS FET driver

3HN2

NMOS FET driver

4SW2

Lower rail voltage for HN2 output

5BST2

Boot-Strap input for HN2 output

6

CT_SYNC_IN

CT synchronous signal input pin

7

CT_SYNC_OUT

CT synchronous signal output pin

8SRT

External resistor from SRT toRT for

adjusting the start-up triangle oscillator

9RT

External resistor from RT toGND for

adjusting the triangle oscillator

10

GND

GROUND

11

BCT

External capacitor from BCT toGND for

adjusting the BURST triangle oscillator

12

BRT

External resistor from BRT toGND for

adjusting the BURST triangle oscillator

13

DUTY

Control PWM mode and BURST mode

14

STB

Stand-by switch

15

CP

External capacitor from CP toGND for

Timer Latch

16

VREF

Reference voltage input pin for Error

amplifier

17

VS

Error amplifier input

18

IS

Error amplifier input

19

FB

Error amplifier output

20

SS

External capacitor from SS toGND for

Soft Start Control

21

COMP

Over voltage detect pin

22

VCC

Supply voltage input

23

UVLO

External Under Voltage Lock Out

24

REG

Internal regulator output

25

BST1

Boot-Strap input for HN1 output

26

SW1

Lower rail voltage for HN1 output

27

HN1

NMOS FET driver

28

LN1

NMOS FET driver