This section describes the connectors and the test
points on the EVM and how to properly connect, set up, and use the
LM5168PEVM EVM. See Figure 3-1 for location of connectors and jumpers.
VOUTOutput voltage of the converterVOUT screw terminal connector. Apply load to this connector (+ and –). The VOUT test point is
used to monitor output voltage.
GNDGround of the converterGND and GNDS test points. Used as ground test points for the EVM.
VINInput voltage to the converterVIN screw terminal connector. Apply input voltage to this connector (+ and –). The VIN test
point is used to monitor input voltage.
VINEMIInput voltage to input filter of the converterIf there is desire to use the built-in EMI filter on the EVM, then connect the input supply to
the VINEMI screw terminal connector (+ and –).
Input FilterEMI mitigationAn 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 VDC.
EN/UVLO JumperSet EN/UVLO pin optionsUse 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 must
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.
- Jumper open (default setup): Device starts up and
shuts down with UVLO.
- Center pin connected to ON: Device starts
up and shuts down without UVLO.
- Center pin connected to OFF: Device is
off.
PGOODThe 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 VOUT through a 100-kΩ,
resistor R10.