KAmodRPI5 REL POW

Description

The multifunctional power supply and executive module for Raspberry Pi 5 allows you to power your Raspberry Pi 5 computer from a power source with a voltage of 8 to 32 V. The module also contains two relays with changeover contacts, which allow you to control receivers with a current of up to 3 A. In addition, the board has a digital input circuit with galvanic separation based on an optocoupler. All these functions have been implemented in one compact module, which can be easily connected to the Raspberry Pi 5 and some similar SBCs.

Basic parameters

• Provides power supply with a voltage of 5.1 V with a continuous current of up to 3 A and a short-term current of up to 5 A
• Adapted to input voltage in the range of 8...32 V
• Voltage regulator based on the XL4015 circuit (step-down, 5 A, 180 kHz, 96%)
• Overvoltage, overload and thermal protection
• Two relay outputs with changeover contacts (NC/ON)
• Maximum relay load: 3 A/250 VAC or 3 A/30 VDC
• Digital input with galvanic separation based on an optocoupler
• Digital input parameters: voltage 3.5…32 V (current: 0.5...5 mA)
• Easy installation on Raspberry Pi 5, also with RPi Active Cooler
• Module dimensions 81x56 mm, height approx. 17 mm (and connector under the board approx. 14 mm high)

Standard equipment

Code	Description
KAmod RPI5 REL+POW Mounting kit	Assembled and launched module A set of screws and spacers for attaching the overlay to the Raspberry board

Electrical diagram

Power connector

Connector	Function
POW Phoenix MC 3.81 mm	Provides power to the module

The POW power connector (J1) allows you to connect a direct current (DC) voltage from the range of 8...32 V, from which a voltage of 5.1 V is generated to power the Raspberry Pi. When connecting voltage to the POW connector, pay attention to its correct polarity.
The marking on the board - [G|V] indicates the correct polarity of the power supply:

• G - pin no. 1 is ground, negative power supply pole (GND),
• V - pin no. 2 is the input of the positive power supply pole.

Do not connect a voltage above 34 V. The module contains overvoltage protection, which will disconnect the power supply at a voltage above 34 V.

The connected power source should have adequate power. In order for the module to operate with all parameters (5.1 V/ 5 A), the power of the power supply should not be less than 30 W. Connecting a lower power supply will result in a lower value of the maximum current at the 5 V output.

Relay outputs

Connector	Function
OUT1, OUT2 Phoenix MSTB 5.08 mm	Relay contacts led out Easy assembly of wires Possibility of quick disconnection

The module contains two HF32F type relays, which allow switching of DC or AC voltage circuits with the following parameters:

• DC – maximum 3 A and 30 V,
• AC – maximum 3 A and 250 V.

The relays contain changeover contacts, connected to OUT1 (J2) and OUT2 (J3) connectors, in accordance with the [NC|CO|NO] markings on the PCB:

• NO – normally open contact with common contact (Normally Open),
• NC – normally closed contact with common contact (Normally Close),
• CO – common contact (Common).

Input with opto-isolation

Connector	Function
IN Phoenix MC 3.81 mm	Universal digital input Wide control voltage range 3.5...32 V Resistant to interference thanks to Schmitt trigger

The IN connector (J5) is connected to a TLP2348 digital optocoupler diode. The optocoupler provides galvanic isolation of the IN input, and the built-in Schmitt trigger eliminates many signal interferences. The active state at the optocoupler output is the logical state "0" (L). The maximum frequency of the input signal is approx. 1 MHz.
The signal at the IN input must be a DC voltage in the range of 3.5...32