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5.1.5
J6 and J7: Power-Good (PG) and Power-Fail (PF) Signals
The TPS7A78 device has two open-drain signals (power-good and power-fail) that are both pulled up to
V
by default.
LDO_IN
Becuase of the high-impedance open-drain logic, the AC supply frequency noise may be present on those
signals when they are high. A low-impedance digital buffer isolation circuit is recommended, such as the
U2 device in
Section
and PF signals directly to the TP7 and TP5 test points because the digital buffer circuit is not populated
with the default EVM setting.
NOTE: When high-voltage differential scope probes are used when testing the TPS7A78EVM-011,
the digital buffer circuit U2 in
J7 must be open to obtain noise-free PG and PF signals.
5.1.6
J2: V
LDO_OUT
Regulated DC output voltage connector.
NOTE: This EVM is optimized for a 3.3-V output and a 27-mA to 55-mA (max) load current. If your
application requires higher output current, see the
section for the proper setting of your application requirement.
5.2
Test Points
Table 3
lists the test points for the TPS7A78EVM-011.
TEST POINTS
TP1
TP2
TP3
TP4
TP5
TP6
TP7
TP8
TP9
TP10
5.3
Performance Data for the TPS7A78EVM-011
As specified in
Section
current, and the EVM can also be configured for FB use.
SBVU048 – March 2019
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4, to obtain noise-free PG ans PF signals. Jumpers J6 and J7 connect the device PG
Section 4
Table 3. Test Point Functions
NAME
AC_P
AC supply line input to the device after the cap-drop capacitor and surge
resistor.
SC_IN
Rectified DC voltage pin; see the
section for the proper setting of your application requirement.
LDO_IN
Charge-pump output pin.
AC_N
AC supply neutral input to the device after the cap-drop capacitor and surge
resistor.
PF
Power-fail pin.
PFD
Power-fail detect pin.
PG
Power-good pin.
LDO_OUT
Regulated DC output pin.
GND
Device GND connected to the thermal pad.
GND
5.1.2, this EVM is configured for an HB 3.3-V output voltage and 27 mA of output
Copyright © 2019, Texas Instruments Incorporated
is recommended to be populated and jumpers J6 and
TPS7A78
Application and Implementation
DESCRIPTION
TPS7A78
TPS7A78EVM-011 Evaluation module
EVM Setup
Application and Implementation
7
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