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THMC45 Datasheet, PDF (11/16 Pages) Texas Instruments – 5-V AND 3.3-V DC BRUSHLESS FAN MOTOR DRIVER WITH SINGLE WIRE CONTOL
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THMC45
5ĆV AND 3.3ĆV DC BRUSHLESS FAN MOTOR DRIVER
WITH SINGLE WIRE CONTROL
SLIS101A − MAY 2001
THERMAL INFORMATION
POWER DISSIPATION
vs
AMBIENT TEMPERATURE
1.3
1.2
1.1
RθJ(SYS) = 100°C/W
1.0
RθJ(SYS) = 125°C/W
0.9
0.8
RθJ(SYS) = 170°C/W
0.7
0.6
RθJ(SYS) = 225°C/W
0.5
0.4
0.3
0.2
RθJ(SYS) = 285°C/W
0.1
0.0
20 30 40 50 60 70 80 90 100 110 120 130 140 150
t − Ambient Temperature − °C
Note: RθJ(SYS) refers to composite thermal impedance provided by the IC package, PCB, and fan housing.
Figure 7
CONTINUOUS CURRENT
vs
AMBIENT TEMPERATURE
0.5
RθJ(SYS) = 100°C/W
0.4
0.3
0.2
RθJ(SYS) = 125°C/W
RθJ(SYS) = 170°C/W
0.1
RθJ(SYS) = 225°C/W
RθJ(SYS) = 285°C/W
0.0
20 30 40 50 60 70 80 90 100 110 120 130 140 150
t − Ambient Temperature − °C
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.
Figure 8
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