简单，高效，廉价的恒功率驱动器

摘要：双方目前的组合电流检测放大器和倍增器（ MAX4211F ）感官和负载两端的电压，其输出（ POUT的）电压成正比，即这些变量的连续产品的供应，成正比负载的瞬时功率。外部运算放大器产生相应的PWM （脉宽调制）输出信号，控制与负载串联p沟道MOSFET 。

Maxim > App Notes > Amplifier and Comparator Circuits Circuit Protection
Keywords: constant-power drivers, resistive loads, chopped-DC drive, op amps, analog multipliers, current-sense amplifiers Nov 29, 2010

APPLICATION NOTE 4523
Constant-Power Driver Is Simple, Efficient, and Inexpensive


Abstract:A combination current-sense amplifier and multiplier (MAX4211F) senses both the current through and voltage across
the load, and supplies at one of its outputs (POUT) a voltage proportional to the continuous product of those variables, i.e.,
proportional to the load's instantaneous power. External op amps generate a corresponding PWM (pulse width modulated) output
signal that controls a p-channel MOSFET in series with the load.

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