This type of buck (step-down) voltage regulator is commonly used in the RC hobby industry, where it is called a “Battery Elimination Circuit” (BEC). It can convert a higher voltage, such as from a motor battery, to a lower 5 V level for powering devices like RC receivers and servos, removing the need for a separate battery. This switching regulator takes an input voltage between 5 and 23 V and reduces it to 5 V, providing up to 3 A of output current. However, the maximum achievable output current of the regulator depends on many factors, including the ambient temperature, air flow, heat sinking, and the input voltage. Note that the ferrite bead shown in the product picture might not be included.
Pololu also carry a similar voltage regulator that is more efficient, works with input voltages as high as 38 V, and includes reverse voltage protection.
Two 7 cm 22-AWG wires with stripped, tinned terminations are attached to the board as input leads. The output lead is a 15 cm 3-wire servo cable with a “JR” style connector on the end, although the white signal line is not used by the regulator. The cable has a female connector that fits nicely with 0.1" male headers, but these connectors are often referred to as “male” in the RC hobby industry. The connector on the output end is the same as what is found on most servos:
The regulator’s output current is rated at 3 A continuous. However, over-temperature protection can kick in at lower output currents. Therefore, the maximum achievable output current of the regulator depends on many factors, including the ambient temperature, air flow, heat sinking, and the input voltage. In Pololu's tests at room temperature, a continuous output current of 3 A was available across nearly the entire input voltage range, although the regulator began to overheat before reaching 3 A at higher input voltages. These continuous current characteristics are limited by thermal dissipation; the regulator can output higher currents for several seconds or even tens of seconds, depending on how low the current is during the off-peak periods. Higher continuous output current can be achieved by reducing the input voltage or by cooling the board by adding a heat sink or a fan.
The efficiency of a voltage regulator, defined as (Power out)/(Power in), is an important measure of its performance, especially when battery life or heat are concerns. As shown in the graph below, this switching regulator typically has an efficiency of 80 to 90%. For example, when regulating 12 V to 5 V with an output current of 1.5 A, the efficiency is above 85%. Since the output power is (Output current)×(Vout) = 1.5 A × 5 V = 7.5 W, the input power will be a bit under 9 W, with about 1.2 W of heat dissipated in the regulator. The input current can then be calculated as 9 W/12 V = 0.75 A. This is far better than a linear voltage regulator, which would require an input current of 1.5 A and 18 W, wasting 10.5 W instead of the 1.2 W lost in this switching regulator.
Exact shipping can be calculated on the view cart page (no login required).
Products that weigh more than 0.5 KG may cost more than what's shown (for example, test equipment, machines, >500mL liquids, etc).
We deliver Australia-wide with these options (depends on the final destination - you can get a quote on the view cart page):
Non-metro addresses in WA, NT, SA & TAS can take 2+ days in addition to the above information.
Some batteries (such as LiPo) can't be shipped by Air. During checkout, Express Post and International Methods will not be an option if you have that type of battery in your shopping cart.
International Orders - the following rates are for New Zealand and will vary for other countries:
If you order lots of gear, the postage amount will increase based on the weight of your order.
Our physical address (here's a PDF which includes other key business details):
Unit 18, 132 Garden Grove Parade
Adamstown
NSW, 2289
Australia
Take a look at our customer service page if you have other questions such as "do we do purchase orders" (yes!) or "are prices GST inclusive" (yes they are!). We're here to help - get in touch with us to talk shop.
Have a product question? We're here to help!
Makers love reviews as much as you do, please follow this link to review the products you have purchased.
Product Comments