最近在用TPS65232调电源,发现上电后电压正常输出,但是芯片发热。不知道为什么,它的效率有多少?哪位使用过该芯片的,知道一下
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Hi
主要在于芯片的散热设计,见datasheet对热阻的定义补充:
Using JEDEC 51-5 (High K) board. This is based on standard 48DCA package, 4 layers, top/bottom layer: 2 oz Cu, inner layer: 1 oz Cu.
Board size: 114.3 x 76.2 mm (4.5 x 3 inches), board thickness: 1.6 mm (0.0629 inch).
或者:
所以在实际应用中,你需要尽量增加加强对芯片的散热设计,以达到降温目的。这类芯片多采用4层板设计,你可以参考上述GND散热面积的相关参数。