SC7422 データシートの表示（PDF） - Silan Microelectronics

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SC7422

2-CH AUDIO POWER AMPLIFIER (2W x 2)

Silan Microelectronics 

SC7422

There is the formula of heat sinking for the SC7422:

șJA = (TJ(max) -TA )/ PDISS

Where șJA is the thermal resistance from junction to ambient, TJ(max) is the junction temperature, TA is ambient

temperature, PDISS is the power dissipation.

If the junction temperature remains below 150°C but the ambient temperature has reached to 50°C, the total

junction-to-ambient thermal resistance must be less than©JA calculated as follows:

șJA = (150°C - 50°C) / 2.6W =38.4°C/W.

Using șJC=26°C /W, the heat-sink thermal resistance must be less than:

șJA - șJC = 12.4°C/W

So the SC7422 doesn’t need heat sink in the normal operation. In application, the copper foil which connects

GND on PCB can be utilized for heat sinking to maintain proper operation temperature.

TYPICAL APPLICATION CIRCUIT

HANGZHOU SILAN MICROELECTRONICS CO.,LTD

Http: www.silan.com.cn

REV:1.0 2006.11.13

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