AD5520 datasheet(18/25 Pages) AD

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AD5520

Rev. B | Page 17 of 24

FORCE CURRENT

In force current mode, the voltage at FIN is now converted to a

current through the following relationship:

Force Current = VFIN/(RSENSE × 16)

Figure 24 shows a simplified diagram of the PMU when in force

current mode. The control loop consists of the force amplifier

with the current sense amplifier making up the feedback path.

In this case, voltage at the DUT is sensed across the voltage

measure amplifier (Gain = 1) and presented at the MEASVOUT

output.

MEASIHx

MEASIL

G= 16

MEASVH

MEASVL

G = 1

FOHx

RDUT

FIN

VMEASIOUT

VMEASVOUT

CLH

CLL

VCLL

VCLH

VFIN

CONDITION

OUTPUT

VCLH > VDUT

VCLL < VDUT

VCLH > VDUT

VCLL > VDUT

VCLH < VDUT

VCLL < VDUT

REFGNDI/V

IDUT =

VFIN

IDUT =

VCLH

IDUT =

VCLL

Figure 24. Current Force, Voltage Measure Mode

MEASURE VOLTAGE

A DUT voltage is tested via the voltage measure amplifier by a

window comparator to ensure that CPH and CPL levels are not

exceeded. In addition, the DUT voltage is automatically tested

against the voltage levels at the clamp, and clamp flags are

enabled if the DUT voltage exceeds either of the levels.

SHORT CIRCUIT PROTECTION

The AD5520 is designed to withstand a direct short circuit on

any of the amplifier outputs.

Figure 25 illustrates the transfer function of the current force

mode.

IDUT

RDUT

VCLL

RDUT

VCLH

VDUT

VFIN

Figure 25. Current Force Transfer Function

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