摘要
采用0.5μm 40 V BCD工艺,实现了一款基于固定关断时间控制模式的升压型直流-直流转换器。采取了输出电压双路反馈的方式,既提高了瞬态响应速度,也简化了补偿网络的设计。同时提出了一种新型的频率控制电路,克服了固定关断时间控制模式开关频率不固定的缺点。测试结果表明,当芯片输入电压为5 V,输出电压为15 V时,峰值效率达到了89.7%,最大输出电流达到500 mA。在300mA的负载跳变下,过冲或欠压小于140 mV,响应时间小于82μs。开关频率变化在目标频率1%以内。
A constant off-time controlled boost converter is realized in 0. 5μm 40 V BCD technology. The adopted two-path feedback method not only speeds the transient response, but also simplifies the compensation network. A novel frequency control circuit is also proposed to compensate switching frequency variation. Measurement results at 5 V input and 15 V output show that the peak power efficiency is 89.7%, the maximum load current is 500 mA. The over- shoot and undershoot are less than 140 mV and recovery time is shorter than 82μs with 300 mA load current step. The switching frequency variation of 1% can be obtained.
出处
《固体电子学研究与进展》
CAS
CSCD
北大核心
2011年第3期286-291,共6页
Research & Progress of SSE
基金
国际合作基金项目:ADI公司项目资助
关键词
固定关断时间控制
升压转换器
双路反馈
环路补偿
频率控制电路
constant off-time control
boost converter
two-path feedback
loop compensa- tion
frequency control circuit
