Introduction
The UBEC is an exter nal switching-mode DC-DC r egulator chip. It draws the DC voltage from a 3-18S LiPo battery and dr ops the voltage to a level suitable for r eceivers and other electronic devices and keeps pr oviding the stable curr ent output of up to 25Amp.
The UBEC has such a powerful output capability , so it is particularly applicable for the large helicopters or fixed-wing air craft which use several servos.
Features
- High efficiency DC-DC regulator chip for transfer efficiency of over 90%.
- Adjustable output voltage (5.2V/6.0V/7.4V/8.4V) applicable f or servos with different voltages.
- 8-channel parallel outputs for gr eater current endurance.
- BEC shoot-through protection prevents the input voltage of the main power supply from directly flowing to the output end of the UBEC and damaging the electronic devices connecting to the output end when the UBEC is accidentally damaged.
- Multiple protections including over-current, (output end) short circuit, overheat, and low-voltage cutoff.
- Backup power supply connecting function allows the connected electronic devices to directly get power from the backup power supply to keep the normal operation when the main power supply connecting to the UBEC is damaged or the UBEC fails.
- External switch allows to turn on/off the UBEC easily .
- Metal housing for quick heat dissipation and less electromagnetic interference.
- LED indicator for indicating the work status of the UBEC and the connecting status of the backup power supply.
Specifications
| Model | UBEC 25A HV |
| Main Input Voltage | 3-18S LiPo |
| Backup Input Voltage | 1-2S LiPo |
| Output Voltage | 5.2V /6.0V /7.4V /8.4V |
| Output Amperage | Continuous Current: 25A, Peak Current: 50A |
| Weight | 74g |
| Size | 55×40.2×17.6mm |
User Guide
Introduction about the UBEC
- The external switch is only for switching on/of f the output of the UBEC, it cannot disconnect the connected the backup power supply .
- The output end of the UBEC can output the voltage of the back up power supply when only the backup power supply is connected to the unit or the external switch is slid to the “OFF” position.
- “-/+/S”: “-” represents “GND wire”, “+” represents “Voltage Output”, and “S” represents “Signal Input & Output”.
- Signals are input through the S pins in the IN group and output through the S pins in the OUT group, they are only transferred for bridging inside the BEC.
- Signal input pins must correspond to signal output pins. That’ s “CH1 IN” corresponds to “CH1 OUT”, “CH2 IN” to “CH2 OUT”, and “CH3 IN” to “C H3 OUT”.
- When only connecting to the “-/+” pins, all the 8 channels ca n function as the BEC output.
- The LED indicator indicates the work status (Red) of the UBEC and the connecting status (Green) of the backup power supply . No matter if the main power supply is connected to the unit or the backup power supply , the LED will tur n on solid Red only if the UBEC functions normally . The LED tur ns on solid Green when the backup power supply is connected to the unit and works normally .
- The external switch is used for turning on/off the UBEC.
Change the Output Voltage
You can set the BEC output voltage to 5.2V/6.0V/7.4V/8.4V via the 3-in-1 DIP switch on the UBEC (as shown in the image below):
If you want to set the voltage to 5.2V, slide all switches (1, 2, and 3) to OFF.
If you want to set the voltage to 6.0V, slide switches (1 and 2) to OFF and switch 3 to ON.
If you want to set the voltage to 7.4V, slide switch 1 to OFF, switch 2 to ON, and switch 3 to ON or OFF (doesn’t matter).
If you want to set the voltage to 8.4V, slide switch 1 to ON and switches 2 and 3 to ON or OFF (doesn’t matter).
From left to right (as shown in the image), they are switch #1, switch #2, and switch #3.
• All “X”s in the diagram mean you can slide the corresponding switch to ON or OFF, it doesn’t matter.
• When both main and backup power are connected to the device, do not set the UBEC voltage much lower than the backup power voltage (e.g., set the UBEC voltage to 5V but connect a 2S LiPo battery with a voltage of more than 5V as a backup power source). Otherwise, when the main power is damaged, the voltage of the backup power may damage the connected electronic devices.
Wiring
When functioning purely as an UBEC for one-channel output:
The Red/Black JR connector can be connected to relevant devices like receiver, FC for providing voltage output & current output.
When functioning purely as an UBEC for multi-channel parallel output:
The Red/Black JR connectors can be connected to relevant devices like receiver, FC for providing (up to) 8-channel parallel voltage output & current output.
When the unit is used for connecting the
gyro and servos on a helicopter：
Other Information
- When the main power supply voltage drops below 9V, the device will start low voltage protection and stop working, then switch to the backup power supply output (with the backup power supply connected to UBEC, the device will keep outputting until the backup power supply runs out of power). If you don’t want to consume the backup power supply, you can disconnect it, or reconnect a fully charged battery to the UBEC to work as the main power supply.
- When your brushless ESC does not have a built-in BEC, you do not need to make any changes to the ESC, just connect the input of the UBEC in parallel to the battery pack, and plug the output of the UBEC into any free channel on the receiver.
- When your brushless ESC has a built-in BEC, you need to disconnect the BEC output of the brushless ESC. That is: unplug the red wire in the cable connecting the brushless ESC and the receiver (as shown below), then connect the input of the UBEC main power supply in parallel to the battery pack, and plug the output of the UBEC main power supply into any free channel of the receiver.
- Adjust the BEC output voltage: You can change the output voltage via the three-in-one DIP switch mentioned earlier. Refer to the “Changing the Output Voltage” section for details.
- Turning the output on/off: Slide the external switch of UBEC to the “ON” position, the output is available; slide it to the “OFF” position, the output is off, or only the backup power supply output is available. If you want to completely turn off the output, you also need to disconnect the backup power supply on the UBEC (in addition to sliding the external switch to the “OFF” position).
- LED indicator:
1) The red LED is used to indicate the working status of the UBEC. If the red LED is on, it means that the UBEC output voltage is normal; if the red LED is not on, please check whether the input line of the main power supply is properly connected to the device. (The red LED will light up regardless of whether the main power supply or the backup power supply is connected to the device.)
2) The green LED is used to indicate whether the backup power supply is connected to the device. If the green LED is on, it means that the backup power supply is connected to the device; if the green LED is not on, please check whether the input line of the backup power supply is properly connected to the device, or whether the backup power supply has power. - The switch-type voltage regulation UBEC may generate some electromagnetic interference during operation and affect the performance of some poor quality receivers (especially old AM and FM receivers). To ensure the normal operation of the receiver, please install the UBEC at a distance of more than 5cm from the receiver.
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