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4.1RecommendedTestEquipment
4.2CalculatingVoltageDropandLoadCurrent
Oscilloscope
Voltage
probe
3.6 V, 2 A Max
7” twisted pair, #20 AWG
+
IN
–
+
OUT
–
EVM
Voltage
probe
Chapter4
SLVU286–January2009
EVMSetup
Thefollowingtestequipmentisrecommended:
•Two-channelstorageoscilloscope
•Currentprobe
•Voltageprobe
•3.6Vat2-Apowersupply
•Volt-ohmmeter
TheusershouldreadtheapplicabledatasheetbeforeusingtheEVM.
Figure4-1showstheEVMtestsetupformeasuringinputandoutputvoltage.Theloadswitchisenabled
intoapassiveon-boardloadforthismeasurement.AftermeasuringthevoltagesatbothV
IN
andV
OUT
,the
voltagedropacrosstheswitchaswellastheloadcurrentcanbecalculatedfromthefollowingequations:
V
DROP
=V
IN
–V
OUT
I
LOAD
=V
OUT
/R
LOAD
Figure4-1.EVMSetupForCalculatingVoltageDropandLoadCurrent
SLVU286–January2009EVMSetup13
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