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Product description: Pololu D24V3AHV - step-down converter 4 V - 25 V 0.3 A
- Dimensions: 23 x 17 x 5 mm
- Cable length:
- Motor cables: 55 mm
- Wires for package: 75 mm
- Cable to receiver: 95 mm
- Weight (with wires): 8 g
- Operational current: continuous 10A / 10 min
- Max. operational current (peak): 15A
- Plug for receiver: JR type
- Number of cells: 2 - 3 LiPo
- Operating voltage: 7.4 - 11.1V
- Built-in functions: brake programming, timing
Leads of Pololu D24V3AHV - step-down converter 4 V - 25 V 0.3 A
The module has four pins:
- VIN- input voltage,
- GND- ground potential,
- VOUT- output voltage,
- SHDN- disabling the system.
If a low state appears on theSHDNpin (below 0.3 V), the converter will be turned off and the current consumption will not exceed 20 uA. Entering a high state (above 2.3 V) reactivates the system. The output can be permanently connected to the VIN or left unconnected if the switch-off mode will not be used.
The connectors are properly labeled on the board. The pitch of the pins is 2.54 mm (popular goldpin connectors). The module can be plugged intothe breadboard, connected withwiresor soldered into a dedicated PCB.
The output voltage is set with a potentiometer. Setting a voltage higher than the input voltage will not damage the system. However, there will be large oscillations. So it is recommended not to set the voltage higher than the input voltage.
Output voltage oscillogram. VIN is 5V. VOUT set above 5V.
Selecting the output voltage
Turning the potentiometer clockwise increases the output voltage.
Efficiency and output current
Efficiency is defined as the ratio of the output power to the input power (Power out) / (Power in). This is a very important parameter when working with portable energy sources (batteries and accumulators), where the working time per one charging cycle is important. The dependence of the efficiency on the input voltage is shown in the graphs below.
Graph showing the relationship between the output voltage and the position of the potentiometer for 4-25V and 2.5-7.5V converters.
Dangerous voltage pulses
When connecting the power supply to the module, dangerous, short electric pulses of large amplitude (so-called pins) may appear, which may permanently damage the system. Pololu tests show that for voltages above 20V, the pins can have an amplitude exceeding 42V. In order to protect against this undesirable phenomenon, it is recommended to solder a capacitor with a value of at least 33uF as close to the converter's power pins as possible.
Specification of the step-down converter 4 V - 25 V 0.3 A - Pololu D24V3AHV
- Input voltage: 4.5 V to 42 V
- Adjustable output voltage: from 4 V to 25 V
- Maximum output current: 300 mA
- Switching frequency 500 kHz
- Built-in protection (switch) to protect against too high power consumption and too high temperature
- Dimensions: 15.3 x 10.2 x 4 mm
- Weight: 1g (without connectors)
