Datasheet

Evaluates: MAX17502G in TDFN Package
MAX17502G Evaluation Kit
2Maxim Integrated
Quick Start
Recommended Equipment
• MAX17502GEVkit
• 15V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15V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) Turn on the DC power supply.
5) Enabletheload.
6) Verify that the DVM displays 12V.
To turn-on/off the part from EN/UVLO, follow the steps
below:
1) Remove resistors R1 and R2.
2) Connect the power supply to the EV kit and turn on
the power supply. Set the power supply at a voltage
between15V 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 1.11V. 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.
Detailed Description of Hardware
The MAX17502G EV kit provides a proven design to
evaluate the MAX17502G high-efficiency, high-voltage,
synchronous step-down DC-DC converter in a TDFN
package. The EV kit generates 12V at load currents up
to 1A from a 15V to 60V input supply. The EV kit features
a 600kHz fixed switching frequency for optimum effi-
ciency and component size. The EV kit features a forced-
PWM control scheme that provides constant switching-
frequency operation at all load and line conditions.
The EV kit includes an EN/UVLO PCB pad to enable
control of the converter output. An additional RESET
PCBpadisavailableformonitoringtheopen-drainlogic
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.
Note: Indicate that you are using the MAX17502 when contacting these component suppliers.
Component Suppliers
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