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MSK5920-3.3ERHD Datasheet(PDF) 4 Page - M.S. Kennedy Corporation |
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MSK5920-3.3ERHD Datasheet(HTML) 4 Page - M.S. Kennedy Corporation |
4 / 7 page APPLICATION NOTES CONT. 4 HEAT SINK SELECTION To select a heat sink for the MSK 5920RH, the follow- ing formula for convective heat flow may be used. Governing Equation: TJ = PD X (R θJC + RθCS + RθSA) + TA Where TJ = Junction Temperature PD = Total Power Dissipation R θJC = Junction to Case Thermal Resistance R θCS = Case to Heat Sink Thermal Resistance R θSA = Heat Sink to Ambient Thermal Resistance TA = Ambient Temperature Power Dissipation=(VIN-VOUT) x IOUT Next, the user must select a maximum junction tem- perature. The absolute maximum allowable junction tem- perature is 150°C. The equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (R θSA). Example: An MSK 5920-2.5RH is connected for VIN=+3.3V and VOUT=+2.5V. IOUT is a continuous 3A DC level. The am- bient temperature is +25°C. The maximum desired junc- tion temperature is +125°C. R θJC=4.0°C/W and RθCS=0.15°C/W for most thermal greases Power Dissipation=(3.3V-2.5V) x (3A) =2.4 Watts Solve for R θSA: 125°C - 25°C 2.4W = 36.5°C/W In this example, a heat sink with a thermal resistance of no more than 36.5°C/W must be used to maintain a junction temperature of no more than 125°C. THERMAL LIMITING The MSK 5920RH control circuitry has a thermal shut- down temperature of approximately 150°C. This ther- mal shutdown can be used as a protection feature, but for continuous operation, the junction temperature of the pass transistor must be maintained below 150°C. Proper heat sink selection is essential to maintain these condi- tions. TYPICAL APPLICATIONS CIRCUIT R θSA= -4.0°C/W - 0.15°C/W FIGURE 2 Rev. G 1/06 |
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