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MAX16820EVKIT Arkusz danych(PDF) 2 Page - Maxim Integrated Products

Numer części MAX16820EVKIT
Szczegółowy opis  MAX16820 Evaluation Kit
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Producent  MAXIM [Maxim Integrated Products]
Strona internetowa  https://www.maximintegrated.com/en.html
Logo MAXIM - Maxim Integrated Products

MAX16820EVKIT Arkusz danych(HTML) 2 Page - Maxim Integrated Products

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MAX16820 Evaluation Kit
2
_______________________________________________________________________________________
Quick Start
Recommended Equipment
24V, 1.5A DC power supply
Voltmeter
LED load rated for at least 1A and a total LED for-
ward voltage drop VFLED ≤ 20V
Procedure
The MAX16820 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.
1) Verify that a shunt is installed on JU1 (MAX16820
disabled).
2) Set the DC power-supply output to 24V.
3) Disable the power-supply output.
4) Connect the power-supply ground to the GND pad
on the EV kit.
5) Connect the power-supply output to the VIN pad on
the EV kit.
6) Connect the LED load’s anode to the LED+ output
pad and the cathode to the LED- output pad.
7) Enable the power supply.
8) Remove the shunt on JU1 (MAX16820 enabled).
9) Measure the voltage across the LED+ and LED-
pads and verify that the voltmeter reads approxi-
mately VFLED.
Detailed Description
The MAX16820 EV kit features the MAX16820 controller
and demonstrates a step-down, constant-current, hys-
teretic controlled regulator for driving HB LEDs. The
MAX16820 EV kit output is current-controlled by moni-
toring the voltage across external high-side sense
resistor R1 in series with the LED output. In hysteretic
mode, the MAX16820 EV kit is configured to output an
LED current of 1A ±6% (ILED). The MAX16820 VIN ris-
ing and falling UVLO threshold points are 5V (max) and
4.5V (min), respectively. The EV kit can operate from a
5V to 28V supply capable of 1.5A.
Typically, capacitor C1 is not required if the power sup-
ply is relatively close to the EV kit. If long wires are used
to connect the power supply to the EV kit, install up to
10µF of bulk capacitance at the surface-mount 2220
pads provided for C1.
Jumper Selection
Enable
EV kit jumper JU1 enables the MAX16820. See Table 1
for JU1 configuration.
Table 1. MAX16820 Enable (Jumper JU1)
Component Suppliers
SUPPLIER
PHONE
WEBSITE
Fairchild Semiconductor
888-522-5372
www.fairchildsemi.com
IRC
361-992-7900
www.irctt.com
Murata Mfg. Co., Ltd.
770-436-1300
www.murata.com
Sumida Corp.
847-545-6700
www.sumida.com
TDK Corp.
847-803-6100
www.component.tdk.com
Note: Indicate that you are using the MAX16820 when contacting these component suppliers.
SHUNT
POSITION
DIM PIN
EV KIT FUNCTION
Installed
Connected to GND
MAX16820 disabled
Not installed
Pulled to VCC
through resistor R2
MAX16820 enabled
(DIM pin can be used
for PWM dimming)


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