Datasheet

MAX16814 Evaluation Kit
Evaluates: MAX16814
4 ______________________________________________________________________________________
using the SYNC PCB pad and an external AC clock
signal. Test points are provided for easy access to IC’s
VCC and SGND.
Enable and UVLO
The EV kit features two jumpers to enable/disable U1
and configure the UVLO. Jumper JU1 enables the EV kit
when a shunt is installed and a shunt is also installed on
pins 1-2 of jumper JU2. Removing jumper JU1 disables
the EV kit. Configuring jumper JU2 to pins 2-3 allows
an external controller to enable the circuit and also dis-
ables UVLO resistors R1 and R2. Connect the external
controller to the ENABLE and SGND PCB pads. Refer to
the Enable section in the MAX16814 IC data sheet for
additional information. See Table 1 for jumper JU1 and
JU2 settings.
HB LED Current
The EV kit features a jumper to reconfigure the IC current
sinks on all 4 channels. When inserted, jumper JU3 con-
figures the current-sink limits to 150mA, and removing
the jumper configures the current-sink limits to 100mA.
See Table 2 for jumper JU3 settings.
To reconfigure the circuit for another current-sink
threshold, replace resistor R15 and use the following
equation to calculate a new value for the desired current:
LED
1500
R15
I
=
where I
LED
is the desired HB LED current in amps and
R15 is the new resistor value for obtaining the desired
HB LED current. Remove jumper JU3 when configuring
for another current-sink level.
Channel 1–Channel 4 Current-Sink Disabling
The EV kit features jumpers to disable each channel’s
OUT_ current sink. When disabling a channel, install
a jumper in the channel’s respective OUT_ jumper.
Remove the shunt to use a channel’s OUT_ sink capabil-
ity. See Table 3 for jumper JU4–JU7 settings.
Table 1. Enable and UVLO (JU1, JU2)
Table 2. HB LED Current (JU3)
Table 3. Disabling Channel 1–Channel 4
(JU4–JU7)
*The series-connected HB LED string must be rated no less
than 150mA.
SHUNT POSITION
EN PIN
EV KIT
OPERATION
JU1 JU2
Installed 1-2
Connected to
UVLO R1 and
R2 divider
Enabled (UVLO
operating)
Not
installed
1-2
Connected to
UVLO R1 and
R2 divider
Disabled
Not
installed
2-3
Connected to
ENABLE PCB
pad
External controller
enabled (no on-
board UVLO)
OUT_ JUMPER
SHUNT
POSITION
CHANNEL OPERATION
OUT1 JU4
Not
installed
Channel 1 operational,
connect an HB LED
string* to VOUT and
OUT1
Installed
Channel 1 OUT1 not
used
OUT2 JU5
Not
installed
Channel 2 operational,
connect an HB LED
string* to VOUT and
OUT2
Installed
Channel 2 OUT2 not
used
OUT3 JU6
Not
installed
Channel 3 operational,
connect an HB LED
string* to VOUT and
OUT3
Installed
Channel 3 OUT3 not
used
OUT4 JU7
Not
installed
Channel 4 operational,
connect an HB LED
string* to VOUT and
OUT4
Installed
Channel 4 OUT4 not
used
SHUNT
POSITION
SETI PIN
HB LED
CURRENT-SINK
LIMITS (mA)
Not installed Connected to R15 100
Installed
Connected to R15
and R16
150