3 Detailed Descriptions
This section describes the connectors and the test points on the EVM and how to properly connect, set up and
use the TPS7H4010EVM. See
for a top view of the EVM. The "_x" in the table below refers
collectively to the the two converter circuits on the PCB: "POL_A" and "POL_B".
VOUT_A (J1 or
J20+) VOUT_B
(J10 or J22+)
Output voltage of the converter.
VOUT_x banana jack and terminal block connectors connect to the power inductor and the
output capacitors. Connect the loading device between VOUT_x and GND_x connectors to
provide loading to the converter. Connect the loading device to the board with short and
thick wires to handle the large DC output current.
GND_A (J2 or
J20-) GND_B (J11
or J22-)
Ground of the converter.
It is connected to the PGND and AGND of the device, as well as the input and output
capacitors. GND_x is the current return path for both supply voltage and load. Connect to
supply and load grounds with short and thick wires.
PVIN_A (J3 or
J19+) PVIN_B
(J12 or J21+)
Input voltage to the converter.
PVIN_x connectors and test points connect to the input capacitors and the PVIN pins of the
TPS7H4010-SEP. Connect the supply voltage from a power supply or a battery between
PVIN_x and GND_x connectors as power input to the board. The voltage range should be
higher than 3.5 V for the device to be active. PVIN should be no higher than 30 V to avoid
damaging the device. The current limit on the supply should be high enough to provide the
needed supply current, otherwise, the power supply will not maintain the desired voltage.
The supply voltage should be connected to the board with short and thick wires to handle
the pulsing input current. If long cables are used to power up the board, the damping
capacitors C14 and C32, located on the bottom side of board, should be added to avoid
oscillations between the cable parasitic inductance and the low-ESR ceramic capacitors.
PVIN_EMI_A (J4)
PVIN_EMI_B
(J13)
Input voltage to input filter of the converter (not installed by default)
If the input filter is desired between the supply voltage and the TPS7H4010-SEP, connect
the supply voltage between PVIN_EMI_x and GND_x. The supply voltage should be
connected to the board with short and thick wires to handle pulsing input current.
GND_A (J5)
GND_B (J14)
Ground connection near the input filter
This is the current return path for the supply connected to PVIN_EMI_x. It provides a direct
connection to the input filter capacitors to best filter the conducted noises generated from
the PCB. Use PVIN_EMI_x and GND_x connection if input filter is used and conducted EMI
test is desired.
POLA_Input Filter
(C11, C12, C13,
C14, L2)
POLB_Input Filter
(C29, C30, C31,
C32, L4)
Reduces noise from supply voltage
The input filter consists of a C-L-C pi configuration, located on the bottom side of the PCB.
To include the input filter in the power path, connect the supply voltage between the
PVIN_EMI_x and GND_x connectors. The output of the filter is connected to the PVIN net,
which is connected to the PVIN pins of the TPS7H4010-SEP and the input capacitors. Note
that the input filter components are not mounted on the PCB by default.
Conducted EMI arises from the normal operation of switching circuits. The ON and OFF
actions of the power switches generate large discontinuous currents. The discontinuous
currents are present at the input side of buck converters. Voltage ripple generated by
discontinuous currents can be conducted to the voltage supply of the buck converter via
physical contact of the conductors. Without control, excessive input voltage ripple can
Detailed Descriptions
SNVU744 – OCTOBER 2020
TPS7H4010EVM User's Guide
7
Copyright © 2020 Texas Instruments Incorporated
