This section describes the connectors and
the test points on the EVM and how to properly connect, set up and use the LM5169FQEVM EVM.
See Figure 3-1 for location of connectors and jumpers.
VOUT
Output voltage of the converter.
VOUT screw terminal connector. Apply load to this connector (+ and -). VOUT test point
is used for monitoring 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 Rtie (R12). This resistor may 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 -). VIN
test point is used for monitoring 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 VDC.
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 shut-down current measurement, these
resistors must also be removed and the EN input (center pin) grounded.
- Jumper open (default set-up):
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.
PGOOD
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 100k Ω, resistor
R10.