Texas Instruments Evaluation Module for TPS62150 a 1-A, synchronous, step-down converter in a 3x3-mm, 16-pin QFN TPS6215 TPS62150EVM-505 数据表
产品代码
TPS62150EVM-505
Added Resistor
Cut This Trace
Setup
1.3.2
Input and Output Capacitors
C2 is provided for an additional input capacitor. This capacitor is not required for proper operation but can
be used to reduce the input voltage ripple.
be used to reduce the input voltage ripple.
C7 is provided for an input capacitor on the AVIN pin. This capacitor is required and populated on the
TPS62130EVM-505. It may be added on the other EVM versions but is not required.
TPS62130EVM-505. It may be added on the other EVM versions but is not required.
C4 is provided for an additional output capacitor. This capacitor is not required for proper operation but
can be used to reduce the output voltage ripple and to improve the load transient response. The total
output capacitance must remain within the recommended range in the data sheet for proper operation.
can be used to reduce the output voltage ripple and to improve the load transient response. The total
output capacitance must remain within the recommended range in the data sheet for proper operation.
1.3.3
Soft-Start Time
C5 controls the soft-start time of the output voltage on the TPS621x0EVM-505. It can be changed for a
shorter or slower ramp up of Vout. Note that as the value of C5 is decreased, the inrush current increases.
shorter or slower ramp up of Vout. Note that as the value of C5 is decreased, the inrush current increases.
1.3.4
Loop Response Measurement
The loop response of the TPS621x0EVM-505 can be measured with two simple changes to the circuitry.
First, install a 10-
First, install a 10-
Ω resistor across the pads in the middle of the back of the PCB. The pads are spaced to
allow installation of 0805- or 0603-sized resistors. Second, cut the trace between the via on the output
voltage and the trace that connects to the VOS pin via. These changes are shown in
voltage and the trace that connects to the VOS pin via. These changes are shown in
. With these
changes, an ac signal (10-mV, peak-to-peak amplitude recommended) can be injected into the control
loop across the added resistor.
loop across the added resistor.
Figure 1. Loop Response Measurement Modification
2
Setup
This section describes how to properly use the TPS621x0EVM-505.
2.1
Input/Output Connector Descriptions
J1 – VIN
Positive input connection from the input supply for the EVM. Use when the steady-
state input current is less than 1 A. Otherwise, use J8.
state input current is less than 1 A. Otherwise, use J8.
J2 – S+/S–
Input voltage sense connections. Measure the input voltage at this point.
J3 – GND
Return connection from the input supply for the EVM. Use when the steady-state input
current is less than 1 A. Otherwise, use J8.
current is less than 1 A. Otherwise, use J8.
J4 – VOUT
Output voltage connection. Use when the steady-state output current is less than 1 A.
Otherwise, use J9.
Otherwise, use J9.
J5 – S+/S–
Output voltage sense connections. Measure the output voltage at this point.
3
SLVU437A – October 2011 – Revised July 2013
TPS62130EVM-505, TPS62140EVM-505, and TPS62150EVM-505
Evaluation Modules
Copyright © 2011–2013, Texas Instruments Incorporated