Datasheet

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5
15
25
35
45
55
65
0510152025
R
θ
SA
− Heatsink Thermal Resistance − °C/W
− Thermal Resistance −
θJA
R C/W
°
No Heatsink
Natural Convection
Air Flow = 150 LFM
Air Flow = 250 LFM
Air Flow = 500 LFM
1 oz. Copper
Power Plane
1 oz. Copper
Ground Plane
0.21 mm
0.21 mm
TPS75901, TPS75915
TPS75918, TPS75925, TPS75933
SLVS318E – DECEMBER 2000 – REVISED MARCH 2004
THERMAL INFORMATION (continued)
Figure 22. Thermal Resistance vs Heatsink Thermal Resistance
Figure 23.
From the data in Figure 22 and rearranging Equation 4 , the maximum power dissipation for a different heatsink
R
ΘSA
and a specific ambient temperature can be computed (see Figure 24 ).
16