MAX16832CEVKIT+ Maxim Integrated Products, MAX16832CEVKIT+ Datasheet - Page 2

• Manufacturer Part Number: MAX16832CEVKIT+
• Description: KIT EVAL FOR MAX16832C LED DVR
• Manufacturer: Maxim Integrated Products

Specifications of MAX16832CEVKIT+

• Current - Output / Channel: 666mA
• Outputs And Type: 1, Non-Isolated
• Voltage - Output: 64V
• Features: Dimmable
• Voltage - Input: 6.5 ~ 65V
• Utilized Ic / Part: MAX16832
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

MAX16832C Evaluation Kit
Before beginning, the following equipment is needed:
•
•
•
•
The MAX16832C 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 could exist on the
LED+ and LED- output pads.
1) Verify that a shunt is not installed across jumper
2) Verify that a shunt is installed across jumper JU2
3) Connect the power supply’s positive terminal to the
4) Connect digital voltmeters across the VIN and
5) Connect the anode of the HB LED string to the
6) Connect the cathode of the HB LED string to the
7) Clip the current probe across the HB LED+ wire to
8) Turn on the power supply and increase the power-
9) Using a voltmeter, verify that the voltage across
2
_______________________________________________________________________________________
6.5V to 65V, 1A power supply
Two digital voltmeters
A series-connected HB LED string rated no less
than 666mA
A current probe to measure HB LED current
JU1 (enabled).
(temperature simulation).
VIN PCB pad on the EV kit. Connect the power sup-
ply’s ground terminal to PGND PCB pad.
PGND PCB pads and the LED+ and LED- PCB
pads.
LED+ pad.
LED- pad.
measure the HB LED current.
supply output voltage from 0V, slowly ramping it up
to 65V (HB LED dependant). Do not hot plug
> 30V DC voltage on the evaluation board! It will
generate over 70V high-voltage spark on the
MAX16832C and damage the IC due to the power
cable inductance-caused ringing with the input fil-
ter capacitor.
TP1 and TP2 is > 2V. If it is not, adjust potentiome-
ter R2 to obtain a reading > 2V.
Required Equipment
Quick Start
Procedures
The MAX16832C EV kit demonstrates the MAX16832C
hysteretic constant-current HB LED driver in an 8-pin SO
package with an exposed pad. The MAX16832C EV kit is
configured in a step-down topology with constant current
driving a string of user-supplied external HB LEDs. The
MAX16832C EV kit operates from a DC supply voltage of
6.5V to 65V and requires up to 1A. The MAX16832C IC’s
UVLO is configured from 6V to 6.5V internally.
The EV kit circuit is configured to deliver 666mA of
current into a series HB LED string with a maximum
64V forward voltage. The average series inductor cur-
rent is set to 666mA (typ) by resistor R1. The
MAX16832C thermal-foldback feature can be evaluat-
ed by connecting a negative temperature coefficient
(NTC) thermistor between the TEMP_I and PGND PCB
pads on the EV kit. Alternatively, a temperature-vary-
ing thermistor circuit can be simulated using poten-
tiometer R2 and resistor R3. The EV kit also features a
DIM PCB pad to evaluate digital PWM dimming opera-
tion of the external HB LEDs.
The MAX16832C EV kit uses a 1oz copper, 2-layer
PCB. It has been designed to provide an example of
good thermal dissipation, incorporating thermal vias
under U1’s exposed pad and additional thermal vias
adjacent to U1. These vias carry additional heat to the
bottom-layer ground plane for maximum thermal con-
ductivity when evaluating a MAX16832 IC.
The MAX16832C EV kit features several jumpers to
reconfigure the PWM dimming, thermal-foldback fea-
ture and for reconfiguring the external HB LED current.
The MAX16832C EV kit features a jumper to enable
and disable U1. Installing jumper JU1 disables the
MAX16832C IC. Additionally, HB LED dimming can be
achieved on the MAX16832C EV kit by applying a digi-
tal PWM signal at the DIM PCB input pad. The signal
can be applied using an open-collector or open-drain
output rated for at least the VIN voltage. Alternatively,
resistor R4 can be removed and TTL logic can control
the DIM pin. Remove the shunt at jumper JU1 to enable
HB LED dimming using a digital PWM signal at the DIM
and PGND PCB pads. The applied signal should have
a 0.6V logic-low (or less) and a 2.8V logic-high (or
greater) level and frequencies from 200Hz to 20kHz. To
adjust the HB LED brightness, vary the signal duty
cycle from 0% to 100%. See Table 1 for jumper JU1
setting of the HB LED dimming operation.
Detailed Description of Hardware
Enable and HB LED Dimming Control
(Digital and Analog)
Jumper Selection