TB6598FN/FNG

2005-01-19

2

Block Diagram

Some functional blocks, circuits, or constants may be omitted or simplified in the block diagram for explanatory

purposes.

Pin Functions

Pin Name

Pin No.

Functional Description

Remarks

AO2

1

Output 2 (Ch. A)

Ch. A motor winding connection pin

RFA

2

Winding current detection pin

(Ch. A)

AO1

3

Output 1 (Ch. A)

Ch. A motor winding connection pin

Vref

4

Internal reference voltage

+0.6 V (typ.)

GND

5

Ground pin

6

Small-signal power supply pin

Vlim

7

Winding current setting pin

Icoil (A)

= Vlimit (V)/external RF (Ω)

EN1

8

Enable input 1

EN2

9

Enable input 2

IN1

10

Control input 1

IN2

11

Control input 2

OSC

12

Internal oscillation frequency

setting pin

Connect an oscillator capacitor externally

13

Motor power supply pin

BO2

14

Output 2 (Ch. B)

Ch. B motor winding connection pin

RFB

15

Winding current detection pin

(Ch. B)

BO1

16

Output 1 (Ch. B)

Ch. B motor winding connection pin

AO1

AO2

RFA

BO1

BO2

RFB

EN1 8

9

10

11

EN2

IN1

IN2

Control

Logic

12

OSC

OSC

7

Vlim

Timing

Logic

5

6

GND

Pre-Drive

H-Bridge

B

13

3

1

2

Timing

Logic

Pre-Drive

H-Bridge

B

TSD

16

14

15

4

Vref

Vref

0.6 V

Band

Gap