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YDA138 Datasheet(PDF) 10 Page - YAMAHA CORPORATION |
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YDA138 Datasheet(HTML) 10 Page - YAMAHA CORPORATION |
10 / 20 page YDA138 10 ● Allowable Dissipation The power dissipation of YDA138 is limited by the junction temperature rating (125℃) and package thermal resistance (35.9℃/W). The power dissipation and junction temperature of YDA138 can be found by the following formula. For the use of YDA138, take care not to exceed the power dissipation and junction temperature. ・ Formula for the Power Dissipation Ploss = (Pout * Rpn / Rl) * 2 + Idc * Vdc Ploss : Allowable Dissipation (W) Pout : Output Power (W) Rpn : 0.66 (Constant) Rl : Load Resistor (Ω) Idc : 0.035(Constant / at VDDP=12V) 0.028(Constant / at VDDP=9V) 0.038(Constant / at VDDP=13.5V) Vdc : Power supply voltage (V) ・ Formula for the junction temperature Tj = Ploss * θja + Ta Ploss : Allowable Dissipation (W) θja : 35.9 (Constant/ package thermal resistance (℃/W)) Ta : Ambient Temperature (℃) ● Mounting The package (42SSOP) for YDA138 has Thermal Pad for radiation on the bottom. This Thermal Pad does not need soldering on the board. ・ Example of Pattern Thermal resistance of the package is 35.9℃/W. This thermal resistance was measured under the following conditions: mounting board 136mm×85mm, copper leaf board density 154%, no wind. In addition, a part of the board that faces to Thermal Pad is a pattern (4mm*6mm) without etching resist, the pattern is connected to the opposite side by through-hole (φ0.4). 最大許容損失 vs 周囲温度 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 1020 30 40 5060 7080 90 周囲温度 (℃) YDA138 の最大許容損失 Maximum allowable dissipation vs ambient temperature Ambient temperature (℃) Maximum allowable dissipation of YDA138 |
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