User Manual

USER GUIDE
19
4.3 Using the Optional Eagle Tree Current Sensor/PSU (ET PSU)
(skip this section if you are not going to use the ET PSU)
Eagle Tree’s high efficiency and low noise PSU accepts up to 6S voltage input, and provides
filtered 5V and up to 12V output at 1A max per channel*. It's perfect for powering most FPV
gear, and can also power your receiver on multirotors (when NO servos are being powered
by the RX!), eliminating the need for an external BEC. The PSU is available with XT60 or
Deans connectors, or with wire leads.
4.3.1 ETS PSU to MicroVector Cable
An optional cable is available (p/n MV-VEC-PSU) which makes connecting the PSU to the
MicroVector very easy. The wiring diagram of this cable is shown below:
To use this cable, simply solder the Video Tx and Camera power leads to the correct voltage(s) for your video
equipment. If you need to supply power to your transmitter directly from your flight pack, you’ll need to splice
(tap) into the wire labeled “Pack Voltage.”
Make sure that you do not make a mistake in the wiring that causes too high voltage to go to a lower
voltage camera or transmitter! This will likely destroy the camera or transmitter.
4.3.2 ET PSU Outputs
Never use the PSU to power any servos on your model! The PSU can shut off due to excessive power
draw, causing a crash! Servos MUST be powered by a standalone BEC, a BEC built into your ESC, or a
separate radio flight pack!
Never exceed the 1 amp current limit for either the 5V tap or the 12V taps. *Do not exceed 500mA
draw on the 5V tap if the the Alerter Buzzer/LCD is used. The affected voltage regulator may shut off if
this is exceeded, which can cause the MicroVector to turn off during flight if the 5V regulator is affected, as well
as shutting off the affected video equipment!
Note that the 12V regulator does NOT boost the voltage, like a SEPIC. However, the MicroVector's 12V PSU has
a unique Low Voltage Loss feature that drops the regulator’s output by only about 0.5V if you are using a 3S
pack operating below 12.5V. For example, if your 3S pack is at 11.5V, the regulator outputs about 11V. Other
non-boost switching regulators typically drop the output voltage by 1.3V or more.
SEPIC and other voltage boost regulators are generally much less efficient and generate much more UHF band
noise, and in many cases you don’t need one. You never need one if your pack is 4s or above, and all known
cameras and many transmitters will operate well across the 3S pack voltage range. Typically, 1.3GHz
transmitters may provide reduced power output with less than 12V voltage, and 5.8GHz transmitters work fine
at less than 12V. Be sure to check your transmitter manual’s specs to determine this. If your transmitter does