Texas Instruments TPS81256EVM-121 3W High-Efficiency Step-up Converter in MicroSiP package Evaluation Module TPS81256EVM TPS81256EVM-121 Datenbogen
Produktcode
TPS81256EVM-121
Connector and Test Point Descriptions
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Connector and Test Point Descriptions
3.1
Connectors
3.1.1
J1: V
IN
Header
This header is the connection for the input power supply and ground. Connect the input power supply to
Pin 1 or 2 and the GND return to Pin 5 or 6. Twist the leads to the power supply and keep them as short
as possible. The input voltage must be between 2.50 V and 4.85 V.
Pin 1 or 2 and the GND return to Pin 5 or 6. Twist the leads to the power supply and keep them as short
as possible. The input voltage must be between 2.50 V and 4.85 V.
The input Sense connections (Pins 3 and 4) allow access to the input voltage directly at the TPS8125x
input capacitors; therefore, a four-wire power and sense supply can be connected. These connections
allow for accurate voltage measurement by avoiding the I x R voltage drop across the PCB traces. Twist
the leads to the sensing connectors if they are used.
input capacitors; therefore, a four-wire power and sense supply can be connected. These connections
allow for accurate voltage measurement by avoiding the I x R voltage drop across the PCB traces. Twist
the leads to the sensing connectors if they are used.
3.1.2
J2: V
OUT
Header
This header is the connection for the output voltage and return. Connect the load between Pin 1 or 2 and
Pin 5 or 6 (GND). The output Sense connections (Pins 3 and 4) allow access to the voltage directly at the
TPS8125x output capacitors. These connections allow for accurate voltage measurement by avoiding the I
x R voltage drop across the PCB traces.
Pin 5 or 6 (GND). The output Sense connections (Pins 3 and 4) allow access to the voltage directly at the
TPS8125x output capacitors. These connections allow for accurate voltage measurement by avoiding the I
x R voltage drop across the PCB traces.
3.2
Other Connectors
3.2.1
J3: SMA Input Connector
This SMA connector is connected to the input voltage node of the converter and can be terminated with a
49.9 ohm resistor. It can be used to easily analyze the noise spectrum of the output voltage with a
spectrum analyzer. By default, J3 is not assembled on the EVM.
49.9 ohm resistor. It can be used to easily analyze the noise spectrum of the output voltage with a
spectrum analyzer. By default, J3 is not assembled on the EVM.
3.2.2
J4: SMA Output Connector
This SMA connector is connected to the output voltage node of the converter and can be terminated with
a 49.9 ohm resistor. It can be used to easily analyze the noise spectrum of the output voltage with a
spectrum analyzer. By default, J4 is not assembled on the EVM.
a 49.9 ohm resistor. It can be used to easily analyze the noise spectrum of the output voltage with a
spectrum analyzer. By default, J4 is not assembled on the EVM.
3.3
Jumpers
3.3.1
JP1: Enable Jumper
Placing a jumper across pins EN and ON ties the EN pin to VIN, which enables the device. Placing a
jumper across pins EN and OFF ties the EN pin to GND, which disables the device.
jumper across pins EN and OFF ties the EN pin to GND, which disables the device.
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TPS8125xEVM
SLVU653 – April 2012
Copyright © 2012, Texas Instruments Incorporated