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4.1 Test Points
Table 4-1. Test Points Available on the TPS40195EVM
TEST POINT NAME DESCRIPTION
TP1 VIN Measure the input voltage at this point.
TP2 GND Ground connection for input voltage measurements
TP3 Soft Start Monitor the soft start capacitor voltage.
TP4 Switch Node Monitor the switch node voltage.
TP5 VOUT Measure the output voltage and ripple at this point, see Section 6.1 .
TP6 GND Ground connection for output voltage measurements
TP7 CHA Input A for loop analysis, see Section 6.3 .
TP8 CHB Input B for loop analysis, see Section 6.3 .
TP9 Power Good Monitor power good signal at this point, see Section 6.4 .
TP10 GND General ground connection
TP11 DISABLE Short TP11 to TP2 to disable the TPS40195 controller, see Section 6.4 .
TP12 SYNC Inject square wave synchronizing pulse here, see Section 6.5 .
TP13 GND Used for output ripple test with TP5, see Section 6.2 .
5 Test Setup
5.1 Equipment
5.1.1 Voltage Source
V
IN
: The input voltage source (V
IN
) should be a 0-V to 20-V variable DC source capable of 20 A
DC
.
5.1.2 Meters
A1: 0 A
DC
to 20 A
DC
, ammeter
V1: V
IN
, 0-V to 20-V voltmeter
V2: V
OUT
, 0-V to 5-V voltmeter
5.1.3 Loads
LOAD1: The output load (LOAD1) should be an electronic constant current mode load capable of 0 A
DC
to 20
A
DC
at 3.3 V.
5.1.4 Oscilloscope
Oscilloscope: A digital or analog oscilloscope can be used to measure the ripple voltage on V
OUT
. It is
also used to monitor various test points around the EVM. Section 6 describes test procedure for these
measurements. For ripple measurements it is not recommended to use the leaded ground connection supplied
with the oscilloscope. This can induce additional noise due to the large ground loop area.
5.1.5 Signal Generator
A signal generator can be used to synchronous the EVM to a higher switching frequency. See Section 6 for
details on doing this.
5.1.6 Recommended Wire Gauge
V
IN
to J1: The connection between the source voltage, V
IN
and J1 of the EVM can carry as much as 20 A
DC
.
The minimum recommended wire size is 2x AWG #16 with the total length of wire less than two feet (2-feet
input, 2-feet return).
J3 and J4 to LOAD1 (Power): The power connection between J2 of the EVM and LOAD1 can carry as much
as 20 A
DC
. The minimum recommended wire size is 2x AWG #16, with the total length of wire less than two feet
(1-foot output, 1-foot return).
www.ti.com Schematic
SLUU297B – DECEMBER 2007 – REVISED JANUARY 2022
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TPS40195 Buck Controller Evaluation Module User's Guide 5
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