Search for your product name or keyword, or use the product categories below
Envistia 20mA LED Driver Constant Current Source Regulator
Where to Buy the Envistia 20mA LED Driver
Overview
The Envistia 20mA LED Driver Module is a simple LED power supply module (constant current regulator, or CCR) that solves the problems of figuring out how to power your LEDs and eliminates the need for current-limiting resistors. When a voltage is applied it actively adjusts its own resistance to allow 20mA (+/- 2mA) to pass through. This makes it a perfect replacement for current-limiting resistors in LED circuits, and eliminates the need to calculate current-limiting resistor values or worry about a varying voltage source. It is perfect for automotive applications because it ensures that your LED is continuously powered with a regulated 20mA regardless of battery voltage spikes, sags and fluctuations.
The module operates with an input voltage of 2V to 45V. It requires ~2V overhead voltage to operate, therefore the minimum voltage is 2V + your LED voltage. For example, if you are driving a single LED with a forward voltage of 3V, the minimum voltage required is 5V (3V + 2V).
20mA LED Driver CCR Specifications
- Input Voltage (Vak): 2V to 45V
- Recommended Maximum Input Voltage: 20V *
- Voltage Overhead: 1.8V
- Output Current: 20mA +/-2mA
- Module Dimensions (Excluding Pins): 0.62″ L x 0.22″ W x 0.11″ H (15.75mm x 5.6mm x 2.8mm)
- Pin-to-pin spacing: 0.4″ (10.16mm)
- Operating & Storage Junction Temperature Range: -55C to +150C
* As the input voltage increases, so does the driver’s power dissipation. Above 20V input, additional cooling (i.e. forced-air or heatsinking) may be required.
Circuit Design and Schematics
The LED driver module can be placed anywhere in the LED circuit, with the module’s anode (the tail end of the arrow silkscreened onto the board) toward the +V power supply, and the module’s cathode (arrow end) toward the ground/-V as shown in Figures 1 and 2 below.
Two or more LED Driver modules can be connected in parallel in order to achieve higher operating current, as shown in figure 3 below. The current through them is additive.
Installing the Driver on a Prototyping Breadboard
The board has 0.032″ solder holes which can accommodate wire down to 22AWG or standard 0.1″ header pins. The pin-to-pin spacing is 0.4 inches, designed to fit standard proto board hole spacing, as shown in Figure 4 below.
Alternately, instead of using the pins, wires can be soldered directly to the plated-through holes. For electrical and environmental protection, it can be covered with heat-shrink tubing.
Dimensions and Mechanical Information
The modules are provided on a scored circuit board that can easily be broken apart. Two 0.1″ header pins are included with each module.
