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Battery Eliminator Circuit (BEC)

Advanced Switching Regulator


3A Switch-Mode UBEC Product Details

1.         Specification:

Output: 5V/ 3A and 6V/ 3A switchable

Input: 5.5V-23V (2-5s lithium battery pack, 5-15cells NiMh / NiCd battery pack)

Size: 41.6mm * 16.6mm * 7.0mm (length*width*high)

Weight: 6g ; 9g (cables included)

Ripple: <50mVp-p(@ 2A /12V)

2.         Features:

The UBEC is an advanced switching regulator, provides over-current and over-heat protection function, and the switching frequency is 300KHz.

The max efficiency of this chip is 92%

Battery polarity is autmatically detected and if incorrectly plugged in, the BEC will not work, but will also not be damaged.

Comparing a linear BEC with this switch-mode BEC: When using a lithium battery pack of more than 3s (11.1 volts), a switch-mode BEC has much higher efficiency than the linear BEC in your ESC. A linear BEC on a 4s lithium battery pack has a typical voltage of 14.8V, in order to change a BEC outputs 5V/ 1A , the current flow into BEC is at least 1A , so the power on BEC is 14.8V* 1A =14.8W. But the useful output power is only 5V* 1A =5W, so the efficiency of BEC is 5W/14.8W=33.8%, the redundant power 14.8W-5W=9.8W changes to heat, which makes the BEC very hot. But a switch-mode BEC with the same 14.8 volt battery in providing 5Volts 1 amp drops the current flow into the BEC to 0.38A (actual test data), so the power on BEC is 14.8V* 0.38V=5.6W, and the efficiency of BEC is 5W/5.6W=89.3%.

The higher the voltage, the more inefficient a standard ESC - linear BEC is and the higher the chance it will burn up in flight. For any setup higher than 11.1 volts, I highly recommend a switching mode BEC. If you have 4 or more Servos in your setup, this BEC will enable you ESC to run cooler (extending it's life) and will provide the power needed to drive your servos more efficiently and with higher amp capacity than most ESC's.