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ISL59117IIZ-T7 Datasheet(PDF) 9 Page - Intersil Corporation |
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ISL59117IIZ-T7 Datasheet(HTML) 9 Page - Intersil Corporation |
9 / 10 page 9 FN6278.0 September 21, 2006 Power Dissipation With the high output drive capability of the ISL59117, it is possible to exceed the +125°C absolute maximum junction temperature under certain load current conditions. Therefore, it is important to calculate the maximum junction temperature for an application to determine if load conditions or package types need to be modified to assure operation of the amplifier in a safe operating area. The maximum power dissipation allowed in a package is determined according to: Where: TJMAX = Maximum junction temperature TAMAX = Maximum ambient temperature ΘJA = Thermal resistance of the package The maximum power dissipation actually produced by an IC is the total quiescent supply current times the total power supply voltage, plus the power in the IC due to the load, or: for sourcing: for sinking: Where: VS = Supply voltage ISMAX = Maximum quiescent supply current VOUT = Maximum output voltage of the application RLOAD = Load resistance tied to ground ILOAD = Load current Power Supply Bypassing Printed Circuit Board Layout As with any modern operational amplifier, a good printed circuit board layout is necessary for optimum performance. Lead lengths should be as short as possible. The power supply pin must be well bypassed to reduce the risk of oscillation. For normal single supply operation, a single 4.7µF tantalum capacitor in parallel with a 0.1µF ceramic capacitor from VS+ to GND will suffice. Printed Circuit Board Layout For good AC performance, parasitic capacitance should be kept to minimum. Use of wire wound resistors should be avoided because of their additional series inductance. Use of sockets should also be avoided if possible. Sockets add parasitic inductance and capacitance that can result in compromised performance. PD MAX T JMAX T AMAX – Θ JA --------------------------------------------- = PD MAX V S I SMAX V S V OUT – () + × V OUT R L ---------------- × = PD MAX V S I SMAX V OUT V S – () + × I LOAD × = ISL59117 |
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