3.2 Detailed Descriptions
This section describes the connectors and the test points on the EVM and how to properly connect, set up, and
use the LM5168FEVM EVM. See
for location of connectors and jumpers.
VOUT
Output voltage of the converter
VOUT screw terminal connector. Apply load to this connector (+ and –). The VOUT test point is
used to monitor output voltage.
VOUT2
Secondary output voltage of the converter
VOUT2 screw terminal connector. One side of this output is connected to the primary ground
(GND) through a tie resistor, R
tie
(R12). This resistor can be removed for a true floating voltage
source. Apply load to this connector (+ and –).
GND
Ground of the converter
GND and GNDS test points. Used as ground test points for the EVM.
VIN
Input voltage to the converter
VIN screw terminal connector. Apply input voltage to this connector (+ and –). The VIN test point is
used to monitor input voltage.
VINEMI
Input voltage to input filter of the converter
If it is desired to use the built-in EMI filter on the EVM, then connect the input supply to the VINEMI
screw terminal connector (+ and –).
Input
Filter
EMI mitigation
An input EMI filter is provided on the EVM. Note L2 and C18 are not populated and must be
installed for the EMI filter to operate. Also, note that the maximum input voltage to the filter is 100
V
DC
.
EN/UVLO
Jumper
Set EN/UVLO pin options
Use this jumper to enable/disable the EVM. The resistors connected to this pin set the input UVLO
thresholds. Input UVLO thresholds are set to approximately 6 V and 5.6 V. These levels can be
changed by changing the values of R5 and R7. For external control of the device, these resistors
should be removed and the control signal applied to the center pin of the header. Note that for
accurate shutdown current measurement, these resistors must also be removed and the EN input
(center pin) grounded.
1. Jumper open (default setup): Device starts up and shuts down with UVLO.
2. Center pin connected to
ON
: Device starts up and shuts down without UVLO.
3. Center pin connected to
OFF
: Device is off.
PGOOD
The PGOOD header used as a test point to monitor the power-good indicator. This flag indicates
whether the output voltage has reached its regulation level. PGOOD is an open-drain output that is
tied to V
OUT
through a 100-kΩ, resistor R
10
.
LM5168FEVM Evaluation Module
LM5168FEVM EVM User's Guide
7
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