THMC40, THMC41

VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS

SLIS097 – MARCH 2000

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

COSC

TACH

CP

VPWR

VOUT

NC

PGND

VPWM

H+

H–

PHA

PHB

AGND

NC

THMC40D

MOTOR

LO

R1

100 k

Ω

L2

L1

HALL

SENSOR

1

2

3

4

5

6

7

14

12

13

11

10

9

8

0.1

µF

C5

10

µF

16 V

GND

Speed Control Input

2200 pF

2

4

3

1

0.1

µF

TACH

+12 V

CR1

1N4002

R2

3.01 k

Ω

C4

0.1

µF

NOTE:

Traces in bold handle highest current.

+

C3

C2

C1

Full Speed Option

Sleep State Option

† Optional resistors control fan operation with open speed control input.

1 – 10 M

Ω†

1 – 10 M

Ω†

‡

‡ An analog ground trace should be connected close to the ground connection of C4 and C5.

Figure 10. THMC40 Application Schematic