DC/DC转换器的开关控制方式有PWM控制和PFM控制。PWM 是脉冲宽度调制 (Pulse Width Modulation) 的缩写 ，PFM 是脉冲频率调制 (Pulse Frequency Modulation) 的缩写。PFM也称为可变频率调制(VFM: Variable Frequency Modulation）。 PWM控制型 振荡频率固定，脉冲宽度（ON时间）随负载变化。

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Because of the widespread use of pulse-width modulation (PWM), the efficiency of a synchronous buck converter operating in this mode is well understood. However, relatively few designers understand ...

Pulse Width Modulation (PWM) is a basic concept that is employed in many areas of electronics. PWM is a simple averaging method that is used in everything from microwave power percentages to LED ...

Compared to the simple diode needed to demodulate AM radio signals, the detector circuits used for FM are slightly more complicated. Wrapping your head around phase detectors, ratio detectors, ...

Microchip Technology’s MCP1603 is a 2-MHz, 500-mA switching regulator that can automatically transition from pulse-width modulation to pulse-frequency modulation. Microchip Technology’s MCP1603 is a 2 ...