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升压电路芯片有5V转正负48?

Other Parts Discussed in Thread: LM5001, LM2588, LM2577

有没有5V转正负48V的开关电源芯片,模拟话机用的输出30mA就够了,选了TI的LM5001,空载可以输出正负48V,但是一加负载立马就降下来了