THMC45

5V AND 3.3V DC BRUSHLESS FAN MOTOR DRIVER

WITH SINGLE WIRE CONTROL

SLIS101A − MAY 2001

11

POST OFFICE BOX 655303

THERMAL INFORMATION

t − Ambient Temperature −

°C

0.0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

1.0

1.1

1.2

1.3

20

30

40

50

60

70

80

90

100

110

120

130

140

150

POWER DISSIPATION

vs

AMBIENT TEMPERATURE

RθJ(SYS) = 100°C/W

Note: RθJ(SYS) refers to composite thermal impedance provided by the IC package, PCB, and fan housing.

RθJ(SYS) = 125°C/W

RθJ(SYS) = 170°C/W

RθJ(SYS) = 225°C/W

RθJ(SYS) = 285°C/W

Figure 7

t − Ambient Temperature −

°C

0.0

0.1

0.2

0.3

0.4

0.5

20

30

40

50

60

70

80

90

100

110

120

130

140

150

CONTINUOUS CURRENT

vs

AMBIENT TEMPERATURE

Note: RθJ(SYS) refers to composite thermal impedance provided by the IC package, PCB, and fan housing.

Analysis assumes combined high and low-side RDSon = 5.5

Ω.

RθJ(SYS) = 100°C/W

RθJ(SYS) = 285°C/W

RθJ(SYS) = 125°C/W

RθJ(SYS) = 170°C/W

RθJ(SYS) = 225°C/W

Figure 8