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Evaluates: MAX44286

MAX44286 Evaluation Kit

Detailed Description of Hardware

The MAX44286 EV kit provides a proven design to

evaluate

the

MAX44286

zero-drift,

high-side,

current-sense amplifier that offers precision accuracy

specifications of VOS less than 7µV (max) and gain error

less than 0.2% (max).

Applying the VRS+ Supply and the Load

The EV kit is installed with a MAX44286FAZS+, which has

a 50V/V gain. The current-sense resistor (RSENSE) value

is 0.05Ω with ±0.5% tolerance. The VOUT is given by:

VOUT = ILOAD x RSENSE x AV

where AV is the gain and ILOAD is the current load applied

to the device. Normal operating VRS+ and VRS- range is

+1.8V to +5.5V.

Measuring the Load Current

The load current is measured as a voltage drop (VSENSE)

across an external sense resistor. This voltage is then

amplified by the current-sense amplifier and presented

at its OUT pin. Like all differential amplifiers, the output

voltage has two components of error (an offset error and

a gain error). The offset error affects accuracy at low

currents and a gain error affects accuracy at large

currents—both errors affect accuracy at intermediate

currents. By minimizing both offset and gain errors,

accuracy can be optimized over a wide dynamic range.

Evaluating Other Gain Versions

The MAX44286 EV kit can be used to evaluate other

gain versions of the MAX44286 (25V/V, 50V/V, 100V/V,

200V/V = T, F, H, Z suffix). Replace U1 of the MAX44286

EV kit with the appropriate version of the MAX44286.

MAX44286 датащи(PDF) 2 Page - Maxim Integrated Products