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1 Setup
This section describes the test points and
connectors on the EVM and how to properly connect,
set up, and use the LMR43620-Q1 EVM.
1.1 Test Points
The test points on the board can be used for
connecting to the input of a power supply and output load for the EVM. See Figure 1-1 for typical test setup. The functions of the test points connections are:
VIN_EMI — Input supply to EVM including an EMI filter. Connect to a
suitable input supply. Connect at this point for EMI test.
GND_EMI — Ground connection for the input supply
VIN — Input supply to the IC. Can be connected to DMM to measure input
voltage after EMI filter.
VOUT — Output voltage test point of EVM. Can be connected to a desired
load.
GND — Ground test points
EN — This test point is connected to the EN pin. By default, there is a
pullup resistor, R1 (RENT), to VIN to enable the IC.
PGOOD — This test point is connected to the PGOOD pin from the IC. Can be
tied to an external supply through a pullup resistor or left open.
SYNC — In a MODE/SYNC trim part, this test point is connected to
the SYNC pin of the IC. This test point can also be connected to an external
clock to synchronize the IC. Make sure R9 (RJM) is installed and R8 (RSYNC) is
not installed when applying a sync clock input.
JEN — This jumper allows the ENABLE input to be connected to GND in order
to disable the IC. By default, this jumper is left open since there is a pullup
resistor, R2 (RENT), to VIN to enable the IC.
JPGOOD — Use this jumper to select how the PGOOD pin is connected. A
jumper can be used to connect pin 2 and 3. In this configuration, the PGOOD pin
will be pulled up to VOUT through R7 (RPGOOD) with a value of 100 kΩ. When
connecting the jumper between pin 1 and 2, the PGOOD pin will be pulled up to
VCC through R7 (RPGOOD) with a value of 100 kΩ. By default, this jumper is not
populated.
JMODE/SYNC — Use this jumper to select the mode of operation in a
MODE/SYNC trim part. Connecting a
jumper between pin 1 and 2 sets the IC operation to PFM (pulse frequency
modulation) mode for a higher efficiency at light load. A jumper between pin 2
and pin 3 causes the IC to operate in FPWM (forced pulse width modulation) mode.
By default, the jumper is connected between pin 1 and 2. Pin 1 is indicated by
the dot on the PCB.