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MAX16822BEVKIT Datasheet(Arkusz danych) 2 Page - Maxim Integrated Products

Numer części MAX16822BEVKIT
Szczegółowy opis  MAX16822B Evaluation Kit
Pobierz  6 Pages
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Producent  MAXIM [Maxim Integrated Products]
Strona internetowa  http://www.maxim-ic.com
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MAX16822B Evaluation Kit
2
_______________________________________________________________________________________
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Central Semiconductor Corp.
631-435-1110
www.centralsemi.com
Coilcraft, Inc.
847-639-6400
www.coilcraft.com
IRC, Inc.
361-992-7900
www.irctt.com
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Note: Indicate that you are using the MAX16822B when contacting these component suppliers.
Quick Start
Required Equipment
Before beginning, the following equipment is needed:
MAX16822B EV kit
6V to 65V, 500mA power supply
Two digital voltmeters
A series-connected HBLED string rated no more
than 350mA
A current probe to measure HBLED current
Procedure
The MAX16822B EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
Warning: Voltages exceeding 42V may exist on the
LED+ and LED- output pads.
1) Verify that a shunt is not installed across jumper
JU1 (enabled).
2) Verify that a shunt is installed across jumper JU2
(temperature simulation).
3) Connect the power supply’s positive terminal to the
VIN PCB pad on the EV kit. Connect the power sup-
ply’s ground terminal to PGND PCB pad.
4) Connect the digital voltmeters across the VIN and
PGND PCB pads and the LED+ and LED- PCB
pads.
5) Connect the anode of the HBLED string to the LED+
pad.
6) Connect the cathode of the HBLED string to the
LED- pad.
7) Clip the current probe across the HBLED+ wire to
measure the HBLED current.
8) Turn on the power supply and increase the input
voltage to 48V (HBLED dependent).
9) Using a voltmeter, verify that the voltage across TP1
and TP2 is > 2V. If it is not, adjust potentiometer R2
to obtain a reading > 2V.
Detailed Description of Hardware
The MAX16822B evaluation kit (EV kit) demonstrates
the MAX16822B hysteretic constant-current HBLED dri-
ver in an 8-pin SO package. The MAX16822B EV kit is
configured in a step-down topology with constant cur-
rent, driving a string of user-supplied external HBLEDs.
The MAX16822B EV kit operates from a DC supply volt-
age of 6V to 65V and requires up to 500mA. The
MAX16822B IC’s UVLO is configured from 6V to 6.5V
internally.
The EV kit circuit is configured to deliver 350mA of cur-
rent into a series HBLED string with a maximum 64V
forward voltage. The average series inductor current is
set to 333mA (typ) by resistor R1. The MAX16822B
thermal foldback feature can be evaluated by connect-
ing a negative temperature coefficient (NTC) thermistor
to the TEMP_I and PGND PCB pads on the EV kit.
Alternatively, a temperature-varying thermistor circuit
can be simulated using potentiometer R2 and resistor
R3. The EV kit also features a DIM PCB pad to evaluate
digital PWM dimming operation of the external HBLEDs.
The MAX16822B EV kit PCB has been designed for
maximum thermal dissipation when evaluating the
MAX16832 IC. The PCB has thermal vias under U1 and
additional thermal vias adjacent to U1’s copper pad.
These vias carry additional heat to the bottom layer
ground plane for maximum thermal conductivity.
However, these vias are not a PCB layout requirement
for the MAX16822 design.
Jumper Selection
The MAX16822B EV kit features several jumpers to
reconfigure the PWM and linear dimming, thermal
foldback feature, and for reconfiguring the external
HBLED current.




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