Amplifier for RGB strips The dynamically developing field of LED lighting requires a whole range of devices for such applications. One of them is the amplifier described here, which can be used to increase the current efficiency of the controller.
The diagram of the amplifier for RGB LED strips is shown in Figure 1. The device has the following parameters:
Band control with a common anode.
+12 VDC power supply.
Three independent channels.
No inversion of the logic level between input and output.
Regeneration of the control signal edges.
Small dimensions, which allow for sealing in a heat shrinkable tube.
The amplifier is composed of three identical function blocks, each of which contains MCP1401 integrated circuit, 1mF ceramic capacitor, MOSFET N-type transistor IRF7201.
Schematic diagram of the amplifier for RGB strips
An integrated driver was used to control the gate of the power transistor, as the circuit consisting of discrete components performing the same function would take up much more space on the board.
The controller contains a Schmitt trigger that forms the edges of the control signal, which limits the power loss during switching. The input is the gate of the MOS transistor, so it is not a load for the control system. Another feature is the signal inversion (MCP1402 is a non-inverting version), which, combined with the fact that the last transistor is in a common source circuit, means that the whole circuit does not invert the phase.