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STD Fiches technique(PDF) 4 Page - Texas Instruments

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Description  TPS84250EVM-001 2.5-A, Integrated Power Solution
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Fabricant  TI1 [Texas Instruments]
Site Internet  http://www.ti.com
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STD Fiches technique(HTML) 4 Page - Texas Instruments

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Test Point Descriptions
www.ti.com
4
Test Point Descriptions
Wire-loop test points have been provided as convenient connection points for digital voltmeters (DVM) or
oscilloscope probes to aid in the evaluation of this device. A description of each test point follows.
VIN
Input voltage monitoring point. Connect a DVM to this point for measuring efficiency.
VOUT
Output voltage monitoring point. Connect a DVM to this point for measuring efficiency,
line regulation, and load regulation.
TB3 VIN
Connect an oscilloscope probe with a short grounding tip to this pair of holes to
measure input ripple voltage.
TB4 VOUT
Connect an oscilloscope probe with a short grounding tip to this pair of holes to
measure output ripple voltage and transient response.
SS/TR
Monitor the voltage on the soft-start capacitor here. Also use it as an input for the
Tracking function.
INH/UVLO
Ground this terminal to inhibit power conversion. When open, the voltage on this pin is
the voltage of the UVLO resistor divider network.
RT/CLK
Monitors the RT pin (timing resistor) of the device. Adding resistance to ground to this
pin raises the switching frequency. The pin also can be driven by a 3.3-V, logic-level
clock signal to set the switching frequency. A frequency range of 400 kHz to 1 MHz is
supported.
PWRGD
Monitors the Power Good pin. A weak pullup to 5.1 V is provided on the EVM. PWRGD
is high when the output voltage is within ±8% of its nominal value.
GND
Ground points for meters of oscilloscope probes.
PH
Via test point for monitoring the Phase pin (switching node) of the device with an
oscilloscope. This test point can be used to measure the switching frequency of the
regulator. Use only a x10 oscilloscope probe to monitor this point. The operation of the
device can be affected by the stray capacitance of conventional cables or x1 probes.
VS+
This signal monitors the point where the feedback-loop monitors the output voltage.
This point can be used to remote sense the output voltage at an external load. It also
can be used as an injection point for a frequency-response loop analyzer. The injection
signal can be applied across the SENSE+ and VOUT test points.
4
TPS84250EVM-001 2.5-A, Integrated Power Solution Evaluation Module
SLVU460A – November 2011 – Revised July 2012
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Copyright © 2011–2012, Texas Instruments Incorporated


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