新增高电压能力的MAX471/MAX472高侧电流检测放大器

摘要：雪崩二极管和电流源提供一个浮动的电源，使高边电流检测放大器工作在高达300V 。

Maxim > App Notes > AMPLIFIER AND COMPARATOR CIRCUITS AUTOMOTIVE

Keywords: high voltage, current sense amp, current monitor, amplifier, high-side, current sense amplifiers, Mar 14, 2003
amps

APPLICATION NOTE 1934
Add High Voltage Capability to the MAX471/MAX472 High-Side
Current Sense Amplifiers

Abstract: An avalanche diode and current source provide a floating power supply to allow high-side current
sense amplifiers to work at up to 300V.


The MAX471 and MAX472 are complete bi-directional high-side current sense amplifiers for portable PCs,
telephones, and other systems where battery/DC line monitoring is important, and where ground continuity
between system and supply is crucial.

However, the part's 36V maximum operating voltage is a limiting factor when higher voltage