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Description
Push button module as an alternative to mechanical buttons. The switch is bistable, one press switches on the power supply and another press switches it off. Additional inputs enable e.g. automatic switching off. The module operates with voltages from 2.2 V to 20 V for current consumption up to 6 A. The board has a built-in small pushbutton and allows the connection of external buttons. The switch current does not affect the controlled system, so you can use different buttons to control a large amount of energy.
Advantages and limitations
The switch controls the MOSFET transistor pair through which the main current flows. The module has many advantages, but also disadvantages compared to mechanical switches. Therefore, before using it in a circuit, it is necessary to thoroughly familiarize yourself with its possibilities.
Advantages
- Small in size
- Protection against reverse current
- Multiple switches can be connected for improved control
- Better switching characteristics than mechanical switches
- Self-disconnecting
- Possibility of digital control by external devices
- Compatible leads withcontact plate, 2.54 mm raster
Disadvantages
- The switch is one-way (VOUT voltage cannot be switched to VIN)
- Limited voltage range
- The switch may lose its state in the event of a power outage (by default it is switched off on the first power supply, but can be switched on in the upper operating range by default).
- Works only with direct current
- No full insulation in off condition
Use of the switch
A built-in button is sufficient for basic use. One press turns the power on and another turns it off. More advanced options are controlled by the other pins:
| Pin | Description |
|---|---|
| VIN | Power supply voltage. |
| VOUT | Output voltage. |
| GND | The weight of the system. |
| A |
Connection via a momentary button to pin B for normal ON/OFF operation. Connection via the instantaneous button to ground for continuous operation. |
| B | Connection via the instantaneous button to pin A for normal ON/OFF operation. |
| ON | Pulse above 1 V on this pin is activated by the switch. |
| OFF | A pulse of more than 1 volt on this pin switches off the switch. |
| CTRL | Direct control over the status of the switch. High state (over 1 V) turns the switch on, low state turns it off. Not switched on does not set the switch status. Do not set CTRL and OFF pins to high state simultaneously. |
The outputs are soldering fields to soldergoldpin connectors (2.54 mmraster). They make it possible to connect the circuit to thecontactboardormain module (e.g. STM32Discovery orArduino)using wires.
For this MOSFET, the heating power of the board is proportional to the square of the flowing current. With a typical 3 A current, it reaches 55 °C and becomes noticeably warm but safe. With adequate heat dissipation, a value of 6 A can be achieved. However, we recommend special care, as the MOSFET transistor can heat up to 150 °C.
Specification
- Maximum voltage: 20 V
- Recommended operating voltage: 2.2 to 16 V
- Continuous current at 55 °C: 3 A
- Continuous current at 150 °C: 6 A
- Maximum current: 12 A
- LED colour: red
- Dimensions: 15 x 18 x 3 mm
- Weight: 0,6 g
Useful links |
