TP4
TP8
Metal Ground Barrel
Probe Tip
Test Setup
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Figure 2. Tip and Barrel Measurement for Output Voltage Ripple
4.3.3
Channel 2 Output Voltage Monitoring (TP6 and TP7)
TPS53127EVM-614 provides two test points for measuring the voltage generated at the VO1 Output by
the module. This allows the user to measure the actual output voltage without losses from output cables
and connectors. All DC Output voltage measurements should be made between TP7 and TP6. To use
TP7 and TP6, connect a voltmeter positive terminal to TP7 and negative terminal to TP6.
4.3.4
Soft-Start Voltage Monitoring (TP1, TP2 and TP3)
TPS53127EVM-614 provides two test points for measuring the soft-start ramp voltages. TP1 monitors the
soft-start ramp of Channel 1. TP2 monitors the soft-start ramp of Channel 2. To use TP1 or TP2, connect
an oscilloscope probe between TP1 or TP2 and TP3.
4.3.5
Switching Node Monitoring (TP3, TP5 and TP11)
TPS53127EVM-614 provides two test points for measuring the switching node waveform voltages. TP5
monitors the switching node of Channel 1. TP2 monitors the switching node of Channel 2. To use TP5 or
TP11, connect an oscilloscope probe between TP5 or TP11 and TP3.
4.3.6
5-V Regulator Output Monitoring (TP3 and TP10)
TPS53127EVM-614 provides a test point for measuring the output of the internal 5V regulator. TP10
monitors the output voltage of the internal 5V regulator. To use TP10, connect a voltmeter positive
terminal to TP10 and negative terminal to TP3.
5
Test Setup
5.1
Equipment
5.1.1
Voltage Source
V
IN
The input voltage source (V
VIN
) shall be a 0-25V variable DC source capable of supplying 3.0 Adc
minimum
5.1.2
Meters
A1: 0-4Adc, Ammeter
V1: VIN, 0-22V voltmeter
V2: VOUT1, 0-2V voltmeter
V3: VOUT2, 0-2V voltmeter
6
TPS53127EVM-614
SLVU434 – February 2011
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