Texas Instruments 3A, 12V Input, Dual 5V and 3.3V Output Non-Synchronous SWIFT (tm) Buck Converter Evaluation Module TPS TPS55386EVM-363 Datenbogen
Produktcode
TPS55386EVM-363
3.4.1
Input Voltage Monitoring (TP1 and TP2)
3.4.2
Channel 1 Output Voltage Monitoring (TP3 and TP4)
3.4.3
Channel 1 Loop Analysis (TP5, TP6, TP7 and TP8)
3.4.4
Channel 1 Switching Waveforms (TP9 and TP10)
3.4.5
TPS55386 IC Ground (TP11)
3.4.6
Channel 2 Switching Waveforms (TP12 and TP13)
3.4.7
Channel 2 Loop Analysis (TP14, TP15, TP16 and TP17)
Schematic
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TPS55386EVM-363 provides two test points for measuring the voltage applied to the module. This allows
the user to measure the actual module voltage without losses from input cables and connectors. All input
voltage measurements should be made between TP1 and TP2. To use TP1 and TP2, connect a voltmeter
positive terminal to TP1 and negative terminal to TP2.
the user to measure the actual module voltage without losses from input cables and connectors. All input
voltage measurements should be made between TP1 and TP2. To use TP1 and TP2, connect a voltmeter
positive terminal to TP1 and negative terminal to TP2.
TPS55386EVM-363 provides two test points for measuring the voltage generated by the module. This
allows the user to measure the actual module output voltage without losses from output cables and
connectors. All output voltage measurements should be made between TP3 and TP4. To use TP3 and
TP4, connect a voltmeter positive terminal to TP3 and negative terminal to TP4. For Output ripple
measurements, TP3 and TP4 allow a user to limit the ground loop area by using the Tip and Barrel
measurement technique shown in Figure 3. All output ripple measurements should be made using the Tip
and Barrel measurement. . Even this Tip and Barrel measurement technique increases the measured
switch edge noise. For improved output ripple measurement, measure the output ripple at the output
capacitor (C5)
allows the user to measure the actual module output voltage without losses from output cables and
connectors. All output voltage measurements should be made between TP3 and TP4. To use TP3 and
TP4, connect a voltmeter positive terminal to TP3 and negative terminal to TP4. For Output ripple
measurements, TP3 and TP4 allow a user to limit the ground loop area by using the Tip and Barrel
measurement technique shown in Figure 3. All output ripple measurements should be made using the Tip
and Barrel measurement. . Even this Tip and Barrel measurement technique increases the measured
switch edge noise. For improved output ripple measurement, measure the output ripple at the output
capacitor (C5)
TPS55386EVM-363 contains a 51
Ω
series resistor (R1) in the feedback loop to allow for matched
impedance signal injection into the feedback for loop response analysis. An isolation transformer should
be used to apply a small (30mV or less) signal across R1 through TP6 and TP8. By monitoring the AC
injection level at TP8 and the returned AC level at TP6, the power supply loop response can be
determined.
be used to apply a small (30mV or less) signal across R1 through TP6 and TP8. By monitoring the AC
injection level at TP8 and the returned AC level at TP6, the power supply loop response can be
determined.
TPS55386EVM-363 provides a surface test pad and a local ground connection (TP10) for the monitoring
of the channel 1 power stage switching waveform. Connect an Oscilloscope probe to TP9 to monitor the
Switch Node voltage for channel 1. Test pads are used on the switch nodes to minimize radiated noise
from the switch node.
of the channel 1 power stage switching waveform. Connect an Oscilloscope probe to TP9 to monitor the
Switch Node voltage for channel 1. Test pads are used on the switch nodes to minimize radiated noise
from the switch node.
TPS55386EVM-363 provides a test point for the IC ground. To measure IC pin voltages, connect the
ground of the oscilloscope probe to TP11.
ground of the oscilloscope probe to TP11.
TPS55386EVM-363 provides a surface test pad and a local ground connection (TP13) for the monitoring
of the channel 1 power stage switching waveform. Connect an Oscilloscope probe to TP12 to monitor the
Switch Node voltage for channel 1. Test pads are used on the switch nodes to minimize radiated noise
from the switch node.
of the channel 1 power stage switching waveform. Connect an Oscilloscope probe to TP12 to monitor the
Switch Node voltage for channel 1. Test pads are used on the switch nodes to minimize radiated noise
from the switch node.
TPS55386EVM-363 contains a 51
series resistor (R13) in the feedback loop to allow for matched
impedance signal injection into the feedback for loop response analysis. An isolation transformer should
be used to apply a small (30mV or less) signal across R13 through TP14 and TP16. By monitoring the AC
injection level at TP14 and the returned AC level at TP16, the power supply loop response can be
determined.
be used to apply a small (30mV or less) signal across R13 through TP14 and TP16. By monitoring the AC
injection level at TP14 and the returned AC level at TP16, the power supply loop response can be
determined.
Using the TPS55386EVM-363 A 12V Input, 5.0V & 3.3V Output, 3A Non-Synchronous Buck Converter
6
SLVU273 – September 2008