4) Set the electronic load to sink 10A.

5) Connect the electronic load’s positive terminal to the

LOAD pad. The load’s ground should be connected

6) Connect the positive terminal of the 5V supply to the

10V and then activate the electronic load.

8) Turn on the 5V power supply and verify that the out-

Detailed Description

The MAX4210E EV kit is a power monitor that uses high-

side current sensing to measure load current and pro-

vides two options for applying source voltage through an

external voltage-divider or as a direct voltage input. When

using the latter option, the source voltage may still need

to be divided down by some means to ensure that the

voltage applied to the IN input of the MAX4210 does not

exceed 1V. The full-scale load current is set at 10A and

the source voltage is allowed to swing between 10V and

20V. The EV kit monitors up to 100W of power, which is

being delivered to the load by the source voltage.

Applying the Source Voltage

Jumper JU1 determines how the source voltage is to be

applied. Place the shunt across pins 1 and 2 of jumper

JU1 to use a divided-down source voltage. The external

resistor-divider formed by R2 and R3 provides the volt-

age division. The second option is to shunt JU1 across

pins 2 and 3, allowing the voltage applied to the VIN pad

to be used directly. In either configuration, care must be

taken not to apply a voltage greater than 1V to the IN

input of the MAX4210E. The source voltage should not

exceed 28V, the full-scale input voltage of the

MAX4210E. Applying any voltages that exceed the EV

kit’s full-scale ratings results in output voltages that are

not proportional to the power being delivered to the load.

The EV kit is shipped with the shunt placed across pins 1

and 2 of jumper JU1. See Table 1 for JU1 function.

Measuring the Load Current

The load current is measured as a voltage drop,

proper load current measurements, the sense resistor

must be chosen so that its voltage drop reaches the

recommended full-scale sense voltage of the IC. The

full-scale sense voltage should be reached when the

full-scale load current is being supplied to the load. The

external sense resistor R1 is determined by setting the

full-scale load current and selecting a full-scale sense

voltage of 100mV to 150mV:

The MAX4210E EV kit, which is assembled with the

MAX4210E, supports a full-scale sense voltage drop of

100mV, and supports a 10A full-scale load current. This

arrangement results in the use of a 10m

Ω sense resistor

on the MAX4210E EV kit. For different full-scale sense

voltage and full-scale load current arrangements, the

equation above can be used to determine the appropri-

ate sense resistor value. The full-scale sense voltages of

alternate MAX4210 versions can be found in Table 2 of

the MAX4210/MAX4211 data sheet.

Output Power

The output voltage provided at POUT is proportional to

the power being delivered to the load:

The voltage measured at POUT is the result of measuring

load current and source voltage and taking their product.

across the current-sense resistor and a divided-down

and source voltage measurements is given below:

Refer to Table 2 in the MAX4210/MAX4211 data sheet for

the power-gain factor of different MAX4210 versions.

VV

R

RR

IN

SOURCE

=

+









3

32

R

V

I

SENSE FULL SCALE

LOAD FULL SCALE

1

=

−

−

_

_

MAX4210E Evaluation Kit

2

_______________________________________________________________________________________

Table 1. JU1 Function

SHUNT

LOCATION

IN PIN

1–2 (default)

Connected to an external resistor-divider

2–3

Connected to the VIN pad