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Pololu RC Switch with Small Low-Side MOSFET

Pololu RC Switch with Small Low-Side MOSFET
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מחיר ₪70
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דגם 1210
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Pololu RC Switch with Small Low-Side MOSFET
 

This tiny board converts hobby radio control pulses to digital on/off signals for use in RC switch and simple RC adapter applications.
One output indicates the presence of a valid RC signal (10-100 Hz pulse rate, 0.5-2.5 ms pulse width),
and the other output indicates whether the pulse width is above or below the
1.6 ms threshold (with ±0.1 ms hysteresis). An integrated small, low-side MOSFET
can be used to drive small loads (up to around 3 A), such as a relay, when the switch is on.
 

The Pololu RC switch with small low-side MOSFET can be used with standard
hobby radio control systems for radio control switch applications or simple interface applications.
Example applications include converting extra RC receiver or servo controller outputs to
simple high/low signals that can control LEDs or bigger MOSFETs or relays and
connecting RC systems to microcontroller projects that do not have the necessary resources for decoding the RC interface.
Two outputs indicate the presence of a valid signal and whether the
switch is on or off, and an integrated low-side MOSFET turns on when the switch is on, allowing the board to drive small loads directly.
The switch also features a flyback (or freewheeling) diode across the drive outputs so that you can connect a coil to them,
such as a motor or relay, without any additional external components.

This compact unit measures a mere 0.4" x 0.6" and weighs just 0.5 g (0.02 oz) without the included header pins.

We offer a version of this RC switch without a MOSFET for applications that just require a low-current
digital signal and a version with a medium-sized MOSFET for applications that require the device to switch larger loads.
 

Using the RC Switch

Connections

The lower-left side of the PCB (as shown to the right) contains three pins that can connect
directly to an RC receiver or servo controller, and the four pins on the lower right side of the PCB are the board’s power supply connections and digital outputs.
These outputs will be at the same levels as the VCC power connection,
which can range from 2.0 V to 5.5 V. VCC is also the gate voltage that is used to turn the MOSFET on, so it should be noted that lower
VCC voltages will lead to higher MOSFET on resistances (which in turn limits the maximum current the device can switch).
The RC signal input pin, RC IN, can handle voltages from 0 to 7 V, and the threshold for a logic high is approximately 1 V.

The load power supply and the load itself can be connected via the pins near the top of the board,
with the positive side of the load on the left and the negative side of the load on the right.
The negative load supply should connect to the ground pad on the top-right side of the board, and the
negative side of the load itself should connect to the pin labeled “MOSFET output”.
The two pins labeled “Load supply” are internally connected and intended to give you convenient connection points for both your load and your load power supply.
There is a flyback (also known as a “freewheeling”) diode between the MOSFET
output and load supply, which allows you to safely connect an inductive load such as a motor or relay.
The MOSFET can deliver up to 3 A with VCC at 5 V; the performance will be worse if the input voltage is lower or if the MOSFET
isn’t kept cool. The MOSFET can tolerate voltages as high as 30 V, but the flyback
diode is only rated for 20 V, so an external diode should be used for load voltages that can exceed 20 V.
If an external diode is used, the load supply pins should not be used; these connections should be made off of the board.

The VCC pin can be connected to the RC supply, VRC, by shorting across the pads on the back side of the PCB
marked by the red box in the picture to the right, allowing either the RC receiver to
power the digital device or allowing the digital system to power the RC receiver.
If the connection between the two power pins is not made, VRC can be left disconnected since it is not used by the RC switch board.

The VCC pin can also be connected to the load supply by shorting across the pads on the back side of the
PCB marked by the yellow box in the picture to the right, allowing either the load supply to
power the digital device or allowing the digital system to power the load.

מידות

Size: 0.4 x 0.6"
Weight: 0.5 g1

מאפיינים כלליים

Maximum operating voltage: 30 V2
Maximum output current: 3 A
Minimum logic voltage: 2 V
Maximum logic voltage: 5.5 V3
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Pololu RC Switch with Small Low-Side MOSFET
לחץ להגדיל
Pololu RC Switch with Small Low-Side MOSFET
לחץ להגדיל
Pololu RC Switch with Small Low-Side MOSFET
לחץ להגדיל
Pololu RC Switch with Small Low-Side MOSFET
לחץ להגדיל
Pololu RC Switch with Small Low-Side MOSFET
לחץ להגדיל
Pololu RC Switch with Small Low-Side MOSFET
לחץ להגדיל