Texas Instruments TPS7A78EVM-011, Руководство пользователя

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AC Line
AC Neutral
TPS7A78EVM-011
J1
High-Voltage
Differential
Scope Probe
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
Device GND
LDO_OUT
Earth GND
TP8 TP10 TP9
Earth GND
Load
J2
J3
R5
Fuse Cap-Drop
TPS7A78
AC+
AC-
GND
TVS
CH.x
R7
J5
xx
When High-Voltage Differential Scope Probes are used, second
surge resistor R7 is not needed; jumper J5 can be shorted
xx
Line
Neutral
AC Power Supply
Oscilloscope
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EVM Setup
9 SBVU048 – March 2019
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TPS7A78EVM-011 Evaluation module
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.
Figure 7. Proper Test Equipment Connections for the FB EVM Configuration