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我在看UCC2897A的电路（www.ti.com/.../slur783a.pdf）时，看到其中有以下这个电路，始终不明白其原理，用Multisim对其仿真，也会报错。
这是个电荷泵电路。TL331构成单稳多谐振荡器，Q7/8缓冲输出，D12/13/C27电荷泵倍压，C25滤波输出。
Hi
Q7/Q8交替导通切换C27 GND形成倍压电路。
