通过pwm控制ctrl脚,要求芯片输出0-5V5HZ的锯齿波,负载大小300mA
现测试3.3V输入,V_Out_max=4.3V
5V输入,V_Out_max=4.6V
电路如何设计,能使V_out_max=5V
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您好,
根据芯片数据手册”8.4.2 PWM Program Mode“中的公式1,CTRL引脚的PWM可改变参考电压VFB。
Vout输出根据公式2计算,需要注意的是公式2中不是固定的1.229 V,而是VFB。
TPS61170 1.2-A High-Voltage Boost Converter in 2-mm x 2-mm2 QFN Package datasheet (Rev. D)