LM2596 Adjustable Power Supply

LM2596 35V 3A Power Supply Module ( Steps Voltage Down )

Voltage Adjustable Supply DC DC Converter 35V 3A Power Module

When you first receive the product, you may need to turn the trimpot 10-20 full turns counterclockwise to lower the voltage.

     The LM2596 Module is a ready-made step down power supply board with adjustable output voltage, built around the LM2596S-ADJ chip. It steps a DC input voltage between 4.5V and 35V down to a stable output voltage that can be set precisely (for example 5.05V) between 1.25V and 33V with a multi-turn trimpot. It delivers up to 3A output current and its efficiency reaches 92%, so it heats up much less than a linear regulator doing the same job.

     The board measures about 44mm x 21mm and carries the LM2596S-ADJ chip, a 47µH inductor, a 100µF 50V input and a 220µF 35V output capacitor and a blue multi-turn adjustment trimpot. The input and output wires are soldered to the 4 pads marked IN+, IN-, OUT+, OUT- at the corners of the board; the board is screwed through 2 mounting holes. It is used to obtain low voltages such as 5V, 3.3V and 9V from sources such as 24V or 12V batteries, adapters and solar panels.

Key features:

     Wide adjustment range: The output voltage is set between 1.25V and 33V with a multi-turn trimpot; since the trimpot turns 20-30 turns in both directions, fine adjustment is easy.

     High efficiency, low heat: Thanks to the 150kHz switching design the efficiency reaches 92%; when stepping 24V down to 5V it does not turn the excess voltage into heat like a linear regulator.

     Up to 3A current: It delivers up to 3A output current; up to 2A it works without a heatsink, at higher current or above 15W it is used with a heatsink.

     Protection inside the chip: The LM2596 chip has current limit (short circuit) and thermal shutdown protection. There is no reverse polarity protection.

     Small and easy to solder: The about 44mm x 21mm board with 4 large connection pads and 2 mounting holes fits easily into an enclosure.

Features:

• Product type: Adjustable step down DC-DC power supply module
• Chip: LM2596S-ADJ
• Input voltage: 4.5V - 35V DC
• Output voltage: 1.25V - 33V DC, adjustable (input voltage must be at least 1.5V higher than the output)
• Output current: Up to 3A (a heatsink is required above 2A or above 15W)
• Efficiency: Up to 92%
• Switching frequency: 150kHz
• Output ripple: About 30mV maximum
• Voltage adjustment: Precise adjustment with a multi-turn trimpot
• Short circuit protection: Yes (current limit inside the chip)
• Overheat protection: Yes (thermal shutdown inside the chip)
• Reverse polarity protection: No
• Components on board: 47µH inductor, 100µF 50V input and 220µF 35V output capacitor
• Connection: 4 solder pads (IN+, IN-, OUT+, OUT-)
• Mounting: 2 mounting holes
• Operating temperature: -20°C / +85°C (below 10W)
• Color: Blue PCB
• Dimensions: About 44mm x 21mm x 14mm
• Weight: About 12gr

Usage information:

• Connect the input source to the IN+ and IN- pads and the load to the OUT+ and OUT- pads. Before connecting the load, measure the output voltage with a multimeter and set it to the value you need.
• The trimpot is multi-turn and can turn 20-30 turns in both directions. Turning it clockwise raises the output voltage, turning it counterclockwise lowers it. A small turn may show no change; many turns are needed to see the effect.
• When you first receive the product the output voltage may be set high; before connecting a low voltage load, turn the trimpot 10-20 full turns counterclockwise and set the voltage while measuring it.

Application areas:

•  5V, 3.3V, 9V supply from 12V and 24V batteries or car electrics
•  Low voltage supply in solar panel and battery systems
•  Led strip and led lighting supply
•  Camera, modem and small device supply
•  Setting DC motor and fan speed by voltage
•  Microcontroller, sensor and relay board supply
•  Stepping an adapter voltage down to the device voltage
•  Adjustable DC supply for bench experiments
•  Efficient voltage step down in battery powered devices

Precautions:

•  The input voltage must not exceed 35V and must be at least 1.5V higher than the output voltage. This module only steps voltage down; the output voltage cannot be higher than the input.
•  There is no reverse polarity protection. Connecting the input and output terminals reversed or swapped damages the board.
•  Above 2A or above 15W, fit a heatsink to the chip and provide airflow; otherwise the overheat protection cuts the output.
•  The module has no current limit setting, only the voltage is adjusted. For jobs that need a current limit, such as battery charging, current must be limited separately.

Package contents:

•  1 Piece LM2596 Module
•  Note: Heatsink and connection cables are not included in the package.