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5.4
Soldering Guidelines
To avoid damaging the LDO, use a hot-air system for any solder rework to modify the EVM for the
purpose of repair or other application reasons.
6
Equipment Connection and Operation
6.1
Equipment Connection
Connect test equipment as described in this section and follow the listed steps to properly take
measurements:
NOTE: The FB configuration for the EVM requires a differential measurement. The TPS7A78 device
GND must not be tied to Earth-GND.
6.1.1
Full-Bridge (FB) Test Equipment Connection
Figure 7
shows an FB connection diagram.
AC Line
AC Power Supply
AC Neutral
Earth GND
Figure 7. Proper Test Equipment Connections for the FB EVM Configuration
SBVU048 – March 2019
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xx
TPS7A78EVM-011
Fuse
Cap-Drop
R5
J1
Line
AC+
Neutral
AC-
xx
TVS
J3
R7
J5
When High-Voltage Differential Scope Probes are used, second
surge resistor R7 is not needed; jumper J5 can be shorted
Copyright © 2019, Texas Instruments Incorporated
J2
Device GND
TPS7A78
LDO_OUT
GND
TP9
TP10
TP8
TPS7A78EVM-011 Evaluation module
EVM Setup
Device GND must be floating and must not be tied to Earth-GND
when Full-Bridge configuration is used.
Use differential measurement as shown below
Oscilloscope
Load
CH.x
High-Voltage
Earth GND
Differential
Scope Probe
9
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