Datasheet

MaximIntegrated │ 2
MAX17502F Evaluation Kit Evaluates: MAX17502F in TDFN Package
www.maximintegrated.com
Component Suppliers
Note: Indicate that you are using the MAX17502 when contacting these component suppliers.
Quick Start
Recommended Equipment
● MAX17502FEVkit
● 7Vto60V,2ADCinputpowersupply
● Loadcapableofsinking1A
● Digitalvoltmeter(DVM)
● Functiongenerator
Procedure
TheEVkitisfullyassembledandtested.Followthesteps
belowtoverifytheboardoperation.Caution: Do not turn
on power supply until all connections are completed.
1) Set the power supply at a voltage between 7V and
60V.Disablethepowersupply.
2) Connect the positive terminal of the power supply to
the VIN PCB pad and the negative terminal to the
nearest PGND PCB pad. Connect the positive ter-
minalofthe1AloadtotheVOUTPCBpadandthe
negativeterminaltothenearestPGNDPCBpad.
3) ConnecttheDVMacrosstheVOUTPCBpadandthe
nearestPGNDPCBpad.
4) Verify that a shunt is installed across pins 1-2 on
jumperJU1.
5) Turn on the DC power supply.
6) Enabletheload.
7) Verify that the DVM displays the expected voltage.
Toturn-on/offthe part from EN/UVLO, followthesteps
below:
1) RemoveresistorsR1andR2andthejumperinstalled
acrosspins1-2onjumperJU1.
2) Connect the power supply to the EV kit and turn on
thepowersupply.Setthepowersupplyatavoltage
between7Vand60V.
3) Connect the function generator output to the
EN/UVLOtestloop.
4) EN/UVLOrisingthresholdis1.24Vandfallingthresh-
old is 1.24V. Make sure that the voltage-high and
voltage-low levels of the function generator output are
greater than 1.24V and less than 1.11V, respectively.
5) While powering down the EV kit, first disconnect the
functiongeneratoroutputfromtheEN/UVLOtestloop
and then turn off the DC power supply.
Careshouldbetakeninboardlayoutandsystemswiring
topreventviolationoftheabsolutemaximumratingofthe
FB/VOpinundershort-circuitconditions.Undersuchcon-
ditions,itispossiblefortheceramicoutputcapacitorto
oscillatewiththeboardorwiringinductancebetweenthe
capacitorandshort-circuitedload,andtherebycausethe
absolutemaximumratingofFB/VO(-0.3V)tobeexceed-
ed.This parasitic boardor wiring inductanceshouldbe
minimizedandtheoutputvoltagewaveformundershort-
circuit operation should be verified to ensure that the
absolutemaximumratingofFB/VOisnotexceeded.
Detailed Description of Hardware
The MAX17502F EV kit provides a proven design to
evaluate the MAX17502F high-efficiency, high-voltage,
synchronous step-down DC-DC converter. The EV kit
generates a fixed 5V, at load currents up to 1A, from a
7V to 60V input supply. The EV kit features a 600kHz
fixed switching frequency for optimum efficiency and
componentsize.TheEVkitfeaturesaforced-PWMcon-
trol scheme that provides constant switching-frequency
operation at all load and line conditions.
TheEVkitincludes anEN/UVLOPCB padandjumper
JU1 toenablecontrol of the converter output.An addi-
tional RESET
 PCB pad is available for monitoring the
converteroutput.TheVCCPCBpadhelpsmeasurethe
internalLDOvoltage.
Soft-Start Input (SS)
The device utilizes an adjustable soft-start function to
limit inrush current during startup. The soft-start time is
adjustedbythevalueofC3,theexternalcapacitorfrom
SStoGND.To adjustthe soft-starttime,determine C3
usingthefollowingformula:
C3=5.55xt
SS
where t
SS
is the required soft-start time in milliseconds
andC3isinnanofarads.
SUPPLIER PHONE WEBSITE
Coilcraft,Inc. 847-639-6400 www.coilcraft.com
MurataElectronicsNorthAmerica,Inc. 770-436-1300 www.murata-northamerica.com
Panasonic Corp.
800-344-2112 www.panasonic.com