T-HOBBY F55A ProII 55A 3-6s AM32 4-in-1 ESC w/ BEC for FPV Drone

High-Current Performance for FPV Power Builds

The F55A Pro II delivers up to 55A continuous current, supporting demanding 5–7 inch FPV drones under aggressive flight conditions.

Ultra-High PWM Frequency for Smoother Control

Supporting PWM frequencies from 16kHz up to 96kHz, the F55A Pro II delivers finer motor control and significantly smoother throttle response.Higher PWM frequency helps reduce motor noise and vibration, improving flight stability and delivering a more refined freestyle and cinematic flying experience.

Premium MOSFET Design for Stable High-Power Output

High-quality MOSFETs rated at 40V with ultra-low 0.75mΩ RDS(on) reduce heat and power loss under high current, improving efficiency, safety, and long-term reliability for demanding FPV flights.

Efficient Cooling Design for Stable High-Current Output

The T-HOBBY F55A ProII adopts an optimized metal cooling fin design to efficiently dissipate heat during high-current operation. This improved thermal performance helps maintain stable output under heavy load, reduces overheating risks, and extends the ESC’s service life, ensuring reliable performance for high-power FPV flights.

Vibration Damping Design for Enhanced Stability

Dedicated mounting holes for damping rings help reduce vibration transfer to the ESC and flight controller, protecting sensitive sensing components and improving overall system stability during aggressive FPV flights.

Designed for Freestyle & Cinematic FPV

Engineered specifically for high-power FPV applications, the F55A Pro II is ideal for freestyle pilots and cinematic FPV creators.

Throttle Range Calibration

T-HOBBY F55A Pro II ESC is designed for pilots who demand both peak performance and reliable safety. This is evident in its clear, step-by-step throttle range calibration process, which ensures your drone's power output is perfectly matched to your transmitter's commands.

Specifications:

Notes:

1. To avoid any damage to the ESCs from irrational propulsion systems and aircraft collocation, please read the relevant manual before ESC utilization. 

2. Please make sure all the wires and joint parts are well insulated; short-circuits will cause damage to the ESCs. If welding is required, please use welding equipment of equivalent power. Bad welding will lead to disorder over aircraft control, and many other unpredictable problems 

3. Never lock the rotor of motors when ESCs are on the run. Otherwise, fatal damage will be caused to ESCs and possibly to the motors too. When motor stalling occurs, please cut off the throttle or pop the batteries out immediately. 

4. Never use ESCs in a high-temperature environment. Being used at high temperatures, ESCs might trigger Temperature Protection and get damaged. 

5. Do not forget to cut off the connection of ESCs and batteries after use. 

6. If you encounter any problems using our products, please feel free to contact our distributors or T-MOTOR directly.

Disclaimer:

Thanks for purchasing our Electronic Speed Controller (ESC). High power system for RC model can be very dangerous. Any improper use may result in injury and damage to human and devices. We strongly recommend that you read this manual carefully before use, and abide by its rules. We assume no responsibility for personal injury, property damage or consequential losses resulting from the product. 

GND: Ground wire 

BAT+: Battery Volt monitoring port with the battery voltage is to connect to the Battery Volt monitoring port on flight controller, 10V:10V Power output port. 

ESC4--ESC1: Throttle Signal lnput Ports. 

Port Ml is for ESC M1, M2 is for ESC M2. M3 is for ESC M3, and M4 is for ESC M4, CURRENT: Amp monitoring port with the amperage of 15.2mv/A is to connect to the Amp monitoring port on flight controller, TELEMETRY: Data transmission port. 

Adjustable Parameters 

1.Startup Power Startup power refers to the max. power allowed at startup stage, which can be any relative value from 0.031 to 1.5. Real power depends on input throttle, but the min. value cannot be lower than 1/4 of the max. power. In addition, startup power, which restricts the power of rotating direction change, shows its influence on bidirectional setting. In low RPM running. max power which can be adiusted via startup power parameters setting, is limited for BEMF voltage detection. In low RPM running (since from 16.1 version), low startup power means low max. power. 

2.Motor Timing There are low, medium low, medium, medium high and high timing settings, and they are 0’,7.5’,15°,22.5°and 30’. Generally, medium timing suits most of the requirements. In case of motor vibration, please try changing motor timing. lt takes longer for high induction motors to demagnetize for direction change which leads to motor stalling or vibration on quick throttle increase. This phenomenon occurs especially at low RPM. High timing allows longer time for demagnetization, and thus helps to improve the above mentioned issue.

3.Demag.Compensation 

Demaq. compensation is meant to avoid motor stalling from long time wire demagnetization High timing helps with that, however, it brings efficiency down. lt begins to detect on demag Compensation occurrence. When motor timing is unavailable, motor rotating direction will be changing according to motor timing estimate. Motor power will be cut off before a next direction change. Demag. compensation degree will be calculated. The severer demag. compensation is, the more power will be cut. When demag. compensation is on “OFF” mode power won’t be cut off. Technically, higher demag, compensation parameter means better protection. Nevertheless, if demag. compensation parameter is set too high, max. power drop sliahtly. 

4.The direction of Motor direction can be norma, reversed, bidirectional and bidirectional reversed. In bidirectional mode, center throttle stands for null throttle. Throttle position above center one, motors rotate normally, otherwise, motors will rotate in a reversed direction, Bidirectional mode will invalid RC parameter setting. 

5.Beep strength 

Beep strength can be adjusted in compliance with normal operation. 

6.Beacon Strength 

ESCs will emit beacon beeps, once null throttle signal lasts for some time. Please note that high beacon strength brings heat to ESCs and motors. 

7.Beacon Delay 

This setting determines the delay in time before beacon beeps.

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