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Datasheet

Datasheet

BD6971FS

TSZ02201-0H1H0B100160-1-2

© 2012 ROHM Co., Ltd. All rights reserved.

28.JUL.2012 Rev.002

www.rohm.com

TSZ22111・15・001

●Typical performance curves(Reference data)

●Application circuit example(Constant values are for reference)

Substrate design note

a) IC power, motor outputs, and motor ground lines are made as fat as possible.

b) IC ground (signal ground) line is common with the application ground except motor ground (i.e. hall ground etc.),

and arranged near to (–) land.

c) The bypass capacitor and/or Zenner diode are arrangement near to Vcc terminal.

d) H+ and H– lines are arranged side by side and made from the hall element to IC as shorter as possible,

because it is easy for the noise to influence the hall lines.

-0.20

-0.15

-0.10

-0.05

0.00

0.05

0

5

10

15

20

Supply voltage: Vcc[V]

Fig.23 CS bias current

Operating range

100°C

25°C

–40°C

Fig.24 PWM controllable 4 wires type motor application circuit

Protection of FG open-drain

Hall bias is set according to the

amplitude of hall element

output and hall input voltage

range.

To limit motor current, the

current is detected.

Note the power consumption of

detection resistance.

Stabilization of REF voltage

Low-pass filter for RNF voltage

smoothing

Circuit that converts PWM duty

into DC voltage

Noise measures of substrate

Minimum output duty setting

Output PWM frequency setting

Maximum output voltage and

current are 20V and 1.0A.

So bypass capacitor,

arrangement near to Vcc

terminal as much as possible

Measure against back EMF

＋

PWM

－

M

0.33

Ω to

0.1µF to

1µF to

SIG

H

200

Ω

to 20k

Ω

100pF

to 0.01µF

0

Ω to

0

Ω to

47pF

to 220pF

OSC

MIN

TH

CURRENT

LIMIT COMP

Vcl

REF

HB

OUT2

H+

H–

FG

OUT1

Vcc

CS

GND

TSD

HALL

BIAS

SIGNAL

OUTPUT

CONTROL

LOGIC

OSC

REF

QUICK

START

RNF

PRE-

DRIVER

1

2

3

4

5

15

7

8

PWM

COMP

PWM

COMP

HALL

AMP

HALL

COMP

PWM SOFT

SWITCHING

LOCK

PROTECT

N.C.

6

N.C.

16

14

13

12

11

9

10

Reverse-connected prevention

of the FAN connector