THMC40 Datasheet, PDF (14/17 Pages) Texas Instruments – VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS

THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
+12 V
CR1
1N4002
TACH
APPLICATION INFORMATION
Speed Control Input
1 – 10 MΩ†
Full Speed Option
1 – 10 MΩ†
R1
100 kΩ
Sleep State Option
C5
10 µF
+
16 V
‡
GND
0.1 µF
C3
C4
0.1 µF
1 _COSC
2 _TACH
3 _CP
4 _VPWR
5
VOUT
6 _NC
7 _PGND
C2
2200 pF
VPWM ¹⁴
H+ ¹³
H– ¹²
THMC40D
PHA ¹¹
PHB ¹⁰
AGND ⁹
NC ⁸
0.1 µF
C1
R2
3.01 kΩ
1
4 HALL 2
SENSOR
3
MOTOR
L2
LO
L1
† _{Optional resistors control fan operation with open speed control input.}
‡ _{An analog ground trace should be connected close to the ground connection of C4 and C5.}
NOTE: Traces in bold handle highest current.
Figure 10. THMC40 Application Schematic
14
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