Setting Up the EVMs
2
SLVU080B – January 2003 – Revised September 2016
Copyright © 2003–2016, Texas Instruments Incorporated
TPS6103x EVM-208 For High Efficient Output Current Boost Converter
2
Setting Up the EVMs
It is important to establish all connections for the EVM before power is applied to the EVM.
❏
Connect a power supply (1.8 V to VOUT, depending on the output voltage of the EVM) to the INPUT
header.
❏
Connect a voltmeter to the OUTPUT header.
❏
Verify that all jumpers are set to the correct value (EN, SYNC). Default value for EN for V
BAT
and SYNC
for GND.
❏
Turn on the power supply and verify the output voltage is within limits described in the
EVM Warnings
and Restrictions
section. It is important to operate this EVM within the input voltage range of 1.8 V to
5.0 V and the output voltage range of 2.5 V to 5.5 V at the dc-dc output.
2.1
Introduction—Evaluation with the TPS6103x EVM
This section details the evaluation process and features of the EVM. For detailed evaluation, a load must
be connected to the output terminal in order to adjust the load current between 0 mA and 1600 mA.
CAUTION
For accurate output voltage and input voltage measurements, it is important to
measure the voltage on the input and output voltage terminals with Kelvin
contacts or with a voltmeter connected directly to the input voltage or output
voltage terminals. This eliminates any measurement errors related to voltage
drops along the input and output terminal wires connected to the power supply
or load.
2.2
Enable (EN) Jumper
This jumper is used to enable the device. Connecting the enable pin (EN) to V
BAT
enables the part. The
device is disabled when EN is set to GND. For more details about the Enable Jumper, refer to the
data sheet.
2.3
Power Save Mode Enable and Synchronization (SYNC) Jumper
This jumper enables the device to enter into power save mode at light load, when it is set to GND. The
device automatically stops switching when the output voltage reached its upper threshold, and starts
switching again, when the lower threshold of the output voltage is reached.
When disabling the power save function by setting the jumper to VBAT, the device stays operating in fixed
frequency mode, regardless of the load current value. In this mode, however reverse current flows back to
the input during light load operation, increasing power losses. The operating frequency stays constant,
which implies low output voltage ripple.
To synchronize the operating frequency to an external frequency, a clock signal can be applied to the
SYNC pin. The device then operates at the applied operating frequency, with no Power Save Mode. For
more details about the applied frequency and synchronization frequency range, refer to the
data
sheet.
2.4
LBI/LBO Comparator
The LBO terminal is an open drain output and has a pullup resistor, R6, connected to the output. The
signal on this pins goes low as soon as the input voltage at LBI falls below the threshold of 500 mV. Refer
to the more detailed description in the
data sheet.
The LBO output stays at high-impedance when the input voltage at LBI is above the appropriate threshold.
A resistor divider (R1, R2) is used on the EVM to monitor the supply voltage. More details about setting
the low battery threshold voltage can be found in the
data sheet.
