Proper Test Equipment Connections For The Half-Bridge (Hb) Evm Configuration - Texas Instruments TPS7A78EVM-011 User Manual

Equipment Connection and Operation
6.1.2 Half-Bridge (HB) Test Equipment Connection
Figure 8 shows an HB connection diagram.
AC Line
AC Power Supply
AC Neutral
Earth GND
Figure 8. Proper Test Equipment Connections for the Half-Bridge (HB) EVM Configuration
To ensure proper connectivity:
1. Set the AC input power supply to 120 V
2. Connect the line lead from the AC power supply to the line pin on the J1 connector of the EVM.
3. Connect the neutral lead from the AC power supply to the neutral pin on the J1 connector of the EVM.
4. Connect a 0-mA to 27-mA load between J2 connecter terminals of the EVM.
6.2 Equipment Operation
Operate the test equipment using the following steps:
1. Turn on the AC power supply.
2. Vary the respective load and input voltage, as necessary, for test purposes.
10
TPS7A78EVM-011 Evaluation module
xx
TPS7A78EVM-011
Fuse Cap-Drop
R5
J1
Line
AC+
Neutral
AC-
TVS
J3
R7
x
J5
x
Half-Bridge Configuration, jumper J3 is shorted
Default EVM setting
AC
Copyright © 2019, Texas Instruments Incorporated
J2
Device GND
TPS7A78
LDO_OUT
GND
TP9 TP10 TP8
and 60 Hz, and turn the power supply off.
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Device GND can be floating or tied to Earth GND when Half-Bridge
configuration is used.
Oscilloscope
Load CH.x
Regular Scope
Earth GND
Probe or
High-Voltage
Differential
Scope Probes
SBVU048 – March 2019
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