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MSK5116-50 Datasheet(PDF) 3 Page - M.S. Kennedy Corporation |
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MSK5116-50 Datasheet(HTML) 3 Page - M.S. Kennedy Corporation |
3 / 5 page APPLICATION NOTES HEAT SINK SELECTION: To select a heat sink for the MSK 5116, the following formula for convective heat flow may be used. Governing Equation: Tj = Pd x (Rθjc + Rθcs + Rθsa) + Ta WHERE: Tj = Junction Temperature Pd = Total Power Dissipation Rθjc = Junction to Case Thermal Resistance Rθcs = Case to Heat Sink Thermal Resistance Rθsa = Heat Sink to Ambient Thermal Resistance Ta = Ambient Temperature REGULATOR PROTECTION: The MSK 5116 series is fully protected against reversed input polarity, overcurrent faults, overtemperature conditions (Pd) and transient voltage spikes of up to 60V. If the regulator is used in dual supply systems where the load is returned to a negative supply, the output voltage must be diode clamped to ground. First, the power dissipation must be calculated as follows: Power Dissipation = (Vin - Vout) x Iout Next, the user must select a maximum junction temperature. The absolute maximum allowable junction temperature is 125°C. The equation may now be rearranged to solve for the required heat sink to ambient thermal resistance (Rθsa). EXAMPLE: An MSK 5116-3.3 is configured for Vin=+5V and Vout=+3.3V. Iout is a continuous 1A DC level. The ambient temperature is +25°C. The maximum desired junction tem- perature is 125°C. Rθjc = 3.6°C/W and Rθcs = 0.15°C/W for most thermal greases Power Dissipation = (5V - 3.3V) x (1A) = 1.7 Watts Solve for Rθsa: Rθsa = 125°C - 25°C - 3.6°C/W - 0.15°C/W In this example, a heat sink with a thermal resistance of no more than 55°C/W must be used to maintain a junction tem- perature of no more than 125°C. DEVICE/CASE CONNECTION: The MSK 5116 series are highly thermally conductive devices and the thermal path from the package heat sink to the internal junctions is very short. Since the case is electrically isolated from the internal circuitry, the package can be directly con- nected to a heat sink. ENABLE PIN The MSK 5116 series of voltage regulators are equipped with a TTL compatible ENABLE pin. A TTL high level on this pin acti- vates the internal bias circuit and powers up the device. A TTL low level on this pin places the controller in shutdown mode and the device draws approximately 10μA of quiescent current. If the enable function is not used, simply connect the enable pin to the input. LOAD CONNECTIONS In voltage regulator applications where very large load cur- rents are present, the load connection is very important. The path connecting the output of the regulator to the load must be extremely low impedance to avoid affecting the load regulation specifications. Any impedance in this path will form a voltage divider with the load. OUTPUT CAPACITOR: The output voltage ripple of the MSK 5116 series voltage regu- lators can be minimized by placing a filter capacitor from the output to ground. The optimum value for this capacitor may vary from one application to the next, but a minimum of 10μF is recommended for optimum performance. This capacitor need not be an expensive low ESR type: aluminum electrolytics are adequate. In fact, extremely low ESR capacitors may contrib- ute to instability. Tantalum capacitors are recommended for systems where fast load transient response is important. Tran- sient load response can also be improved by placing a capaci- tor directly across the load. 1.7W 3 = 55.07°C/W 8548-51 Rev. B 4/12 |
Similar Part No. - MSK5116-50_15 |
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Similar Description - MSK5116-50_15 |
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