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NJW4302

THREE-PHASE DC BRUSHLESS MOTOR CONTROL IC

Japan Radio Corporation  

NJW4302

THREE-PHASE DC BRUSHLESS MOTOR CONTROL IC

s GENERAL DESCRIPTION

The NJW4302 is a three-phase DC brushless motor

pre-driver IC for precision applications.

The NJW4302 consists of PWM driver, motor velocity

control, FG(Frequency Generator) output, and voltage

velocity integration circuit.

The NJW4302 realizes stabilized velocity and it is suitable

for printer, FAX, and other DC motor control systems.

s PACKEGE OUTLINE

NJW4302FA1

Preliminary

•s FEATURES

Speed discriminator and PLL speed

control circuit

• Direct PWM driver

• CR oscillator

•Lock protection output

•Break circuit (short circuit braking)

•Start/stop switch Start/Stop Switch Circuit

•Current limit circuit

•Thermal shut down/Under voltage

lockout circuit

•FG output amplifier/Integrating circuit

•Shunt regulator output : 5V

•Bi-CMOS technology

•PACKAGE OUTLINE QFP44

s PIN CONFIGRATION

WL VH VL UH UL RF H3 H3 H2 H2 H1

WH

PVCC

VCC

VREG

DGND

AGND

VSH

CR

CROCK

R

C

NJW4302 QFP44

H1+

FGIN+

FGIN-

FGOUT

FGSOUT

PGND

AGND

N2

N1

SS

CLK

sBLOCK DIAGRAM

FILO FILI

TOC

INT IN POUT LD BR FR

INTREF INTOUT DOUT

FGIN-

F G IN+

Pout

Vre g

VS H

CLK

FGO

-

+

-

+

FGSO D o ut L D

O

LD

FG

C R OC K IN TR EFIN TIN IN TOU TS/S

F

ROCK

OSC

IN TEGR ATION

AMP

SPEED

D I SC RIMI N ATOR

VR EG 1

SPEED

PLL

VC OO U T

PLL COUNTER

S /S

VR EF

ALTER N ATIVE

C OU N TER

CIR CUIT

PWM BLOCK

BR

F/R

V+

BR

F/R

L OGIC

H AL L

H YS

AMP

PR OTEC TION

C IR C U IT

TS D / L VD S

P R I- D R IVER

H1+

H1 -

H2+

H2 -

H3+

H3 -

FILI FILO

R

C

N1 N2 GND CR RF TOC

U L VL WL U H VH WH

-1 -

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