Many devices in unmanned vehicles require a quality power supply, and it is very useful to know the actual and real consumption of these components. Our TFSBEC module is designed to provide power to servos, autopilot (flight controller), and other medium-power drone accessories. In case the user needs more current or two independent sources on his drone, for example, a separate source for avionics and power-consuming elements (actuators), it is possible to chain these modules.
| Parameter | Value | Note |
|---|---|---|
| Regulator technology | Switched step-down | LMR14050 |
| Input voltage | 6 - 40 V | Equivalent of 2S to 9S li-pol accumulators |
| Output voltage | 5.4 V, 5 A | based form the PX4 standard, can be adjusted |
| Regulated connector | Molex Click-n-mat 6p, JST-GH 6p | Connectors are parallel |
| In/Out connector | XT30 | max current 15 A |
| Current measurement range | 0 - 50 A | |
| Volts per Amper | 39.6 mV/A | From component datasheet |
| Current measurement Volts offset | 330 mV | From component datasheet |
| Voltage measurement range | 0 - 40 V | Depend on target ADC max input ( max. 3.95 V ) |
| Voltage measurement divider | 10.13 | From schematic |
| Size | approx. 46 x 30 mm | PCB only |
| Weight | PCB only | |
| Compatibility | Pixhawk-based drones | As a quality source, it can be operated on any drone |
These constants are nominal values taken from the datasheet:
- A = BAT1_A_PER_V = 25.2525
- B = BAT_V_OFFS_CURR = 0.33
- BAT1_V_DIV = 10.13
QGC build-in measurement can be used to estimate parameters more precisely for the specific piece. The PX4 estimation of current is calculated from the ADC raw voltage by the following formula:
For the computation of BAT_V_OFFS_CURR, multiple current measurements are usually needed, because there are significant peaks due to powering of electronics with a low current consumption.