MAX9922EUB(2009) Просмотр технического описания (PDF) - Maxim Integrated

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MAX9922EUB
(Rev.:2009)

Ultra-Precision, High-Side Current-Sense Amplifiers

Maxim Integrated 

Ultra-Precision, High-Side

Current-Sense Amplifiers

Optional Noise Reduction Capacitor

A noise reduction capacitance of ~1nF can be con-

nected between OUT and FB, if needed. Noise reduc-

tion is achieved by both limiting the amplifier

bandwidth, reducing contribution of broadband white

noise and by attenuating contribution of any small

20kHz autozero ripple that appears at the output. Using

higher values of feedback capacitance reduces the

output noise of the amplifier, but also reduces its signal

bandwidth.

Efficiency and Power Dissipation

At high current levels, the I2R losses in RSENSE can be

significant. Take this into consideration when choosing

the resistor value and its power dissipation (wattage)

rating. The sense resistor’s value will drift if it is allowed

to heat up excessively. The precision VOS of the

MAX9922/MAX9923 allows the use of small sense resis-

tors to reduce power dissipation and reduce hot spots.

Sense Resistor Connections

Take care to prevent solder and trace resistance from

causing errors in the sensed voltage because of the high

currents that flow through RSENSE. Either use a four termi-

nal current-sense resistor or use Kelvin (force and sense)

PCB layout techniques to minimize these errors.

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