Электронный магазин частей для минироботов Миниробо

Этот мощный настраиваемый повышающий регулятор может генерировать выходное напряжение до +25 В из входных  1,5 В.  Потенциометр позволяет вам установить выходное напряжение в пределах 4 ... 25 В. Имеет размеры 10.7 x 22.4 x 5.8 мм.

Overview
Настраиваемый повышающий регулятор Pololu является очень гибким импульсным регулятором (DC/DC-преобразователь) который может генерировать напряжение выше, чем его входное напряжение. Pololu предлагает два регулируемых диапазонах: примерно 2,5В ... 9,5В и 4В ... 25В. Выходное напряжение может быть установлено с помощью потенциометра в верхнем правом углу платы. Диапазон входного напряжения 1,5В ... 16В (входное напряжение должно быть ниже выходного). Встроенный 2А ключ позволяет выходным токам быть достаточными для управления небольшими двигателями, такими как в 3pi robot, и дает значительный прирост в напряжении, например получение 24 V от двух NiMH или NiCd батареек.
 

Note: For high-volume applications, this product can be customized with fixed output voltages ranging from 2 V to 30 V.

  Some example applications include: 

• Powering 5 V or 3.3 V systems from lower-voltage batteries.
• Powering 5 V subsystems (e.g. sensors) in lower-voltage (e.g. 3.3 V) systems.
• Achieving consistent actuator operation when powered by fluctuating batteries
• Powering high-brightness LEDs or a large number of LEDs in series

Feature summary

• input voltage: 1.5 V to 16 V
• output adjustable from 2.5 V to 9.5 V or 4 V to 25 V
• 750 kHz switching frequency
• 2 A switch (and input) limit
• integrated over-temperature and over-current shutoff
• typical efficiency of 80-90% when doubling voltage and with 100-500 mA output
• small size: 10.7 x 22.4 x 5.8 mm (0.42" x 0.88" x 0.23")
• weight without header pins: 1.6 g (0.06 oz)

Using the Boost Regulator
Connections
The boost regulator has just three connections: the input voltage, ground, and the output voltage. These three connections are labeled on the back side of the PCB, and they are arranged with a 0.1" spacing along the edge of the board for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1" grid. You can solder wires directly to the board or solder in either the 3x1 straight male header strip or the 3x1 right-angle male header strip that is included.

Setting the output voltage
The output voltage can be adjusted using a meter and a light load (e.g. a 1k resistor). Turning the potentiometer clockwise increases the output voltage. The output voltage can be affected by a screwdriver touching the potentiometer, so the output measurement should be done with nothing touching the potentiometer. The potentiometer has no physical end stops, which means that the wiper can be turned 360 degrees and into an invalid region in which the output voltage is set to approximately 2.5 V (for both the 2.5 V to 9.5 V and 4 V to 25 V versions). The input voltage should not exceed the output voltage, so we recommend setting the output voltage with the input voltage set to around 2.5 V.
 

Output voltage settings for the adjustable boost regulators.

The absolute limit for the input voltage is double the output set voltage. For example, if the output is set to 6 V, the input must not exceed 12 V. Once the input exceeds the output set point, the output voltage will rise with the input voltage since the input is connected to the output through an inductor and a diode.

Note: The trimmer potentiometer is not rated for continual adjustment back and forth; the intended application is to set the output voltage a few times in its life.
Efficiency and available output current

The available output current depends on the input and output voltages. The input current is limited to approximately 2 A, and the efficiency is typically 80%. Therefore, the maximum available current will be approximately 800 mA when doubling the input voltage and approximately 400 mA when quadrupling the input voltage. At high output powers, the 20% lost in the regulator will cause substantial heating, which can limit the available output power (the regulator will automatically shut off if its internal temperature gets too high). At low output currents and high input and output voltages, the efficiency drops closer to 50%, though the lower power involved prevents heating from being an issue.