Rev A, October 18, 2019
15
Manual Number 9019411
SECTION 4 OPERATION
4.1
ELECTRICAL PERFORMANCE
The TA360 USB Power Delivery Charging Port converts an aircraft (DC) input voltage within the range
specified to a voltage between 5VDC and 20VDC on the output, depending on the level negotiated
between the device and the charger. This output power is independently applied to single or dual USB-C
connectors in accordance with the
USB 3.1
and
USB Power Delivery
standards
.
For the dual port option that includes a USB Type-A connector, the USB D+ and D- data lines
communicate with the USB portable device to tell the device it is a dedicated charging port (DCP),
capable of a higher current than a standard USB port. This allows the USB portable device to draw up to
3.0 Amps at 5VDC.
The unit is designed as a DC-to-DC converter with a series switch on each output to regulate current
applied to that output. Each series switch independently reduces the output current to a safe level if the
USB portable device draws excess current, is shorted or has a fault.
If the temperature of the TA360 becomes elevated due to a fault or excessive load, the device will
seamlessly communicate with the USB portable device to lower the charge current. This allows the device
to continue charging while the unit returns to a temperature within designed limits. When the temperature
returns to a safe level the TA360 will automatically reestablish the higher charge current level with the
device and continue charging.
4.2
PROTECTIVE FEATURES
4.2.1 Over-Current Protection
The TA360 monitors power individually on each port. During an over-current condition, the
output power is disabled until the over-current condition is resolved with the connected
device.
4.2.2 Short Circuit Protection
The TA360 will survive a short circuit event without permanent damage. The unit disables
output power as it would for over-current protection until the short is removed.
4.2.3 Low Input Voltage Shutdown
If the input voltage applied to the TA360 drops below 22 VDC the unit will shut down until the
applied voltage returns to a level within range.
4.2.4 Over-Temperature
When the internal temperature of the TA360 exceeds designed thresholds, the unit will shut
down and stop providing power. When the temperature returns to an acceptable level the unit
will automatically begin providing power as requested.
4.2.5 Reverse Polarity
The TA360 will protect itself against being installed with the input power wires reversed.