MAX16802BEVKIT Maxim Integrated Products, MAX16802BEVKIT Datasheet - Page 2

• Manufacturer Part Number: MAX16802BEVKIT
• Description: EVAL KIT FOR MAX16802
• Manufacturer: Maxim Integrated Products

Specifications of MAX16802BEVKIT

• Current - Output / Channel: 750mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 12V
• Features: Dimmable
• Voltage - Input: 10.8 ~ 30V
• Utilized Ic / Part: MAX16802B
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX16802B EV kit is fully assembled and tested.
Follow these steps to verify operation. Do not turn on
the power supply until all connections are completed.
1) Connect a DC power supply (0 to 30V or above, 1A)
2) Connect a voltmeter or oscilloscope and the LED
3) Close the jumpers J1 and J2 to disable dimming.
4) Turn on the power supply and increase the input
5) Open shunt J1 and apply a PWM signal to PWM_IN
6) Close J1, and then open J2. Connect a variable volt-
Caution: Avoid powering up the EV kit without con-
necting load.
The MAX16802B evaluation kit is a current-controlled,
high-output-current LED driver capable of supplying
constant currents up to 750mA, irrespective of supply
voltage variations.
MAX16802B Evaluation Kit
Note: Indicate you are using the MAX16802B when contacting these manufacturers.
2
Central Semiconductor
Coilcraft
Diodes Inc.
Murata
Susumu Co Ltd.
TDK
Vishay
to +VIN and GND.
array (connected in series to drop about 12V at
750mA forward current) to +VLED and -VLED with
anode connected to +VLED and cathode to -VLED.
voltage to above 10.8V. The output voltage increas-
es to forward bias the LED array and delivers
approximately 750mA regulated average LED cur-
rent. Increase the supply further up to 30V and the
output average current will be regulated throughout
the range.
with a frequency of 200Hz and 0 to 2V amplitude.
Vary the duty cycle from 0 to 100% and the LED
brightness varies from 100% to 0%. When the PWM
duty cycle is 0%, the LED brightness is 100%.
age source to LIN_IN and vary the voltage between
0 and 1.6V. The LED brightness varies from 100% to
0%. When the voltage input at LIN_IN is 0V, the LED
brightness is 100%.
_______________________________________________________________________________________
SUPPLIER
Detailed Description
Quick Start
631-435-1110
847-639-6400
805-446-4800
770-436-1300
208-328-0307
847-390-4373
402-563-6866
PHONE
This EV kit is based on a discontinuous current mode
(DCM) buck-boost converter operating at 262kHz to
deliver a finite amount of energy to the output every
cycle. The amount of this energy depends primarily on
the value of the inductor and the user-programmable
peak inductor current and does not depend on the sup-
ply voltage. Due to this configuration, the power output
of the EV kit, and thus the output current supplied to the
LED at a given LED operating voltage, becomes inde-
pendent of the supply voltage.
This EV kit is designed to drive LED loads capable of
taking up to 750mA of maximum current at a 12V operat-
ing voltage. If an LED load with lower operating voltage
is used, then the maximum output current will increase
by the same ratio to maintain the output power constant.
To drive an LED array with a different operating voltage,
the value of the current-sense resistor needs to be
adjusted. Calculation of the current-sense resistor for a
different output operating voltage is explained in later
sections.
Input supply UVLO is implemented by using a resistor
network that combines R3 and R4, which senses the
input supply voltage and uses the EN pin to turn on the
circuit when the input supply voltage goes above
10.8V. The wake-up threshold of EN is 1.23V when the
voltage at EN is rising, and it has a hysteresis of 50mV.
Once the device is turned on, due to the hysteresis, the
device turns off only if the input supply voltage goes
below 10.4V.
The UVLO threshold can be adjusted by varying R1 or
R2 using the equation below:
where V
tain threshold accuracy, keep the value of R4 less than
100kΩ.
631-435-3388
847-639-1469
805-446-4850
770-436-3030
208-328-0308
847-390-4428
402-563-6296
UVLO
FAX
is the desired UVLO threshold. To main-
R
3
=
Component Suppliers
⎛
⎜
⎝
V
1 23
UVLO
.
www.centralsemi.com
www.coilcraft.com
www.diodes.com
www.murata.com
www.susumu-usa.com
www.component.tdk.com
www.vishay.com
−
Input Supply UVLO
1
⎞
⎟ ×
⎠
R
WEBSITE
4