YDA138 Ver la hoja de datos (PDF) - Yamaha Corporation

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YDA138

STEREO 10W DIGITAL AUDIO POWER AMPLIFIER

Yamaha Corporation 

YDA138

●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

Pout

Rpn

Rl

Idc

Vdc

：Allowable Dissipation (W)

：Output Power (W)

：0.66 (Constant)

：Load Resistor (Ω)

：0.035(Constant / at VDDP=12V)

0.028(Constant / at VDDP=9V)

0.038(Constant / at VDDP=13.5V)

：Power supply voltage (V)

・Formula for the junction temperature

Tj = Ploss * θja + Ta

Maximum a最llo大w許ab容le 損dis失sipvasti周on囲vs温a度mbient temperature

4.0

3.5

3.0

2.5

2.0

1.5

1.0

0.5

0.0

0

10 20 30 40 50 60 70 80 90

Ambie周n囲t te温m度pe　ra(℃tur)e (℃)

MaximuYmDAal1lo3w8aのble最d大iss許ipa容tio損n o失f YDA138

Ploss

θja

Ta

：Allowable Dissipation (W)

：35.9 (Constant/ package thermal resistance (℃/W))

：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).

10

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