Wiring the Unit

Before wiring the unit into your system it is recommended to configure the device and confirm with a multimeter that the correct voltages are set.

microFLUX 4LP is suitable for connecting both directly to batteries and to upstream regulators. Cable runs to the unit should be kept as short as is practical to reduce loss. Ensure correct polarity on the input as incorrect polarity can result in fire.

Connector used: Molex Micro-Fit+ 2x2 (2125280401).

Mating Connector Housing: Molex 2064610400 OR 2064610410

A range of wire gauges can be used to connect to the microFLUX. Wire size and its matching crimp should be chosen to match the expected current at the bus input and channel outputs. To calculate your input current, use the following:

Channel Output Power = Output Voltage X Output Current

Channel Input Power = Channel Output Power + Loss

Total Input Power = Sum of all Channel Input Powers

Max Input Current = Total Input Power / Lowest Battery Voltage

For each output channel calculate the worst case output power

Channel loss data is provided below:

Choose crimps and wire gauge from the table below based on the maximum input current required. The current in this table assumes all four contacts are equally loaded. Using only two contacts is also allowable with half the input current limit. All crimps listed below are compatible with the mating connector housing.

Pre-terminated wires are available for fast bring-up such as 0367693064 (16 AWG) or 0367693071 (24 AWG).

microFLUX outputs are not isolated - input and output grounds are directly connected internally. When routing power connections, avoid ground loops or allowing excessive ground current to flow through the unit.

Never connect multiple channels in series to increase output voltages as this will result in a short circuit on the output of the channel.

It is not recommended to connect channels in parallel. Connecting the channels in parallel cannot guarantee increased current rating.

The microFLUX 4LP output connector provides four positive and four negative wires. These can be routed separately to different loads, connected together to power a single higher power load, or provide redundant wiring for lower loading levels. If separated, ensure that any single load does not exceed the current rating of the number of pins connected.

Connector used: Molex 1.5mm CLIK-Mate 4x2 (2132280811)

Mating Connector Housing: Molex 5031490800

Pre-terminated wires are available for fast bring-up such as 2157111124 (black) and 2157112124 (red).

The CAN interface is used both offline for configuration and recovery of logs, and optionally during operation for live telemetry and control.

There are two primary wiring topologies for CAN networks, a bus or a star network (stubs). If a star network is used, keeping the stub length below 1 m is important (the DroneCAN specification recommends a maximum of 0.3 m [11.8 in]).

Two CAN connectors are provided to allow for daisy chaining or for redundant cabling configurations. Use twisted pair wire with 120 ohm impedance.

microFLUX has a built-in software controlled CAN termination which can be set during unit configuration. CAN termination should be enabled on the farthest node on the bus from the flight computer for optimal signal integrity.

The CAN interface is isolated to prevent ground loops and provide a highly reliable signal. To operate, a positive voltage between 4.75V and 12V must be provided on the CAN V+ pin.

Connector used: JST BM04B-GHS-TBT

Mating Connector: JST GHR-04V-S

Excessively capacitive loads can cause issues on start-up due to high inrush currents. While the built-in soft-start is highly robust to highly capacitive loads, it is recommended to keep capacitance below 1 mF for HV channels and 3 mF for LV channels to avoid abnormal start-up waveforms.

When using with inductive loads, ensure that any voltage spike observed on the microFLUX output when switching does not exceed the rated voltage.