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KIA79M05PI Datasheet(PDF) 9 Page - KEC(Korea Electronics) |
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KIA79M05PI Datasheet(HTML) 9 Page - KEC(Korea Electronics) |
9 / 9 page 2002. 9. 24 9/9 KIA79M05F/PI/T~79M15F/PI/T Revision No : 2 Design Considerations The KIA79M ×× fixed voltage regulator series have thermal overload protection from excessive power, internal short circuit protection which limits the circuit’s maximum current, and output transistor safe-area compensation for reducing the output current as the voltage across the pass transistor is increased. Although the internal power dissipation is limited, the junction temperature must be kept below the maximum specified temperature in order to meet data sheet specifications. To calculate the maximum junction temperature or heat sink required, the following thermal resistance values should be used ; Tjmax - Ta PDMAX = or θ JC+θ CA Tjmax - Ta = θ JA θ CA=θ CS+θ SA Solving for TJ : TJ = Ta+PD (θ JC+θ CA) or = Ta+PD θ JA Where TJ = Junction Temperature Ta = Ambient Temperature PD = Power Dissipation θ JC = Junction to Case Thermal Resistance θ CA = Case to Ambient Thermal Resistance θ CS = Case to Heaksink Thermal Resistance θ SA = Heatsink to Ambient Thermal Resistance θ JA = Junction to Ambient Thermal Resistance Typical Applications Bypass capacitors are necessary for stable operation of the KIA79M ×× series of regulators over the input voltage and output current ranges. Output bypass capacitors will improve the transient response of the regulator. The bypass capacitors (2.2 μF on the input, 1.0μF on the output), Should be ceramic or solid tantalum which have good high frequency characteristics. If aluminum electrolytics are used, their values should be 10 μF or larger. The bypass capacitors should be mounted with the shortest leads, and if possible, directly across the regulator terminals. (1) Required if regulator is separated from filter capacitor by more than 3. For value given, capacitor must be solid tantalum. 25 μF aluminum electrolytic may be substituted. (2) Required for stability. For value given, capacitor must be solid tantalum. 25 μF aluminum electrolytic may be substituted. Values given may be increased without limit. For output capacitance in excess of 100 μF, a high current diode from input to output (1N4001, etc.) will protect the regulator from momentary input shorts. * Improves transient response and ripple rejection. Do not increase beyond 50 ≦F. R1+R2 VOUT=VSET ( ) R2 Select R2 as follows : KIA79M05 300 Ω KIA79M08 470 Ω KIA79M12 750 Ω KIA79M15 1k Ω PACKAGE θ JC (℃/W) θ JA (℃/W) DPAK 10.4 96.1 KIA79XX + + GND IN OUT -VO -VI 1 µF CO = 2.2 µF CI = 2.2 µF - + 1 C - + KIA79MXX - + SOLID TANTALUM C 25 µF 3 1 R R2 TANTALUM C 1 µF SOLID 2 25 µF C 3 Varlable Output * INPUT OUTPUT |
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