www.valontechnology.com 6 5/13/2016
It is possible to charge the internal battery from a USB source. However, the USB is barely 5.0V
which is acceptable for changing the battery but no load should be connected to the 6.0V
output connector while charging from USB. One reason is that the USB may not be able to
provide the current required to charge the battery and power the load. Another reason is that
the USB power sags considerably when powering external devices and will not meet the 6.0V
required by Valon synthesizer products. Finally, Valon Technology will not and does not accept
any responsibility for any damage caused to a USB powering device.
4.2
Output Power Connection
The output connector provides an accurate and stable 6.0V whenever the boost converter is on
and power is being taken from the battery. When the power is being provided by the external
power supply/charger, then the output voltage will be approximately equal to the input voltage
minus minimal internal switch losses and cable losses.
The internal load bypass switch circuit will detect the presence of the input voltage and pass that
to the output connector. That voltage may not be adequate (<6V) to power a synthesizer. Make
sure that power supply output voltage is correct.
4.3
Wrong Connections
There is nothing to prevent connecting the power supply or ac adapter/charger into the 6V OUT
connector of the UPS6V-2. Doing so will not damage the power supply or the UPS6V-2. Simply
disconnect and reconnect the cable to the correct connectors.
You may make a mistake in reversing the polarity of the external power supply or ac adapter
charger. This will not damage the UPS6V-2 or the external power supply. The UPS6V-2 will not
draw reverse current from the 6V IN connector.
The only precaution is to avoid the possibility of connecting an external power supply or ac
adapter to the 6V OUT connecter with reversed polarity. This will draw excessive current from
the source and may damage the UPS6V-2. Typically, if the external power supply is current limited
to <3A, then no permanent damage will occur.
