一种高性能DC-DC升压变换器的设计

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设计了一种内部集成控制电路和DMOS功率开关管的单片集成电流型PWM升压变换器。该芯片的开关频率为1.6MHz,采用1.5μmBCD工艺实现,具有很宽的输入电压范围(2.7~14V)、高转换效率(负载电流1~500mA)。给出了芯片设计方法、思路及主要单元电路模块,如振荡器、输入比较、PWM比较及过温保护电路,的设计方案,总结了该芯片设计中应注意的次谐波振荡和开关噪声问题。仿真及实验测试结果充分验证了芯片的各项性能。
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