The Realtek RTL8139C(L) is a highly integrated and cost-effective single-chip Fast
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本电路采用电压调整器TL431A，首先生成2.495V的基准电压，再经过同相放大生成3.3V电压，为保证3.3V电源的带载能力，后增加一功率三极管，这样3.3V电源电流
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5V to 3.3V to offer higher performance at lower cost. Replacing traditional 5V digital controlcircuitry by
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LDO芯片，PW6206， DC-DC降压IC：PW2312PW2330PW2250.18V降压3.3V，15V降压3.3V的降压IC和LDO芯片方案
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