1 Watt LED Driver Circuit - 220 V, 120 V

1 Watt LED Driver Circuit - 220 V, 120 V

In this post we learn how to make a simple mains operated 1 watt LED driver circuit using SMPS buck converter topology.

High power LEDs are optimally with constant regulated DC current, requiring a "driver" or "converter" to supply the required current from an AC or DC power stream. An uncomplicated solitary stage power converter based around the IRS2980 LED driver IC gives you a in control current output over a large AC line or DC voltage input range. The IRPLLED7 evaluation board is an off line non-isolated constant current Buck regulator LED driver which is designed to supply a 350mA DC output current. The LED output voltage is usually about 90% of the input voltage, operating from an AC line input voltage between 90 and 250VAC 50/60Hz or 50 to 300VDC. Moreover it comprises of PWM dimming ability from 10% to 100% of illumination output regulated by an inside potentiometer.

The IRS2980 is a hysteretic Buck controller working with in nonstop conduction method (CCM) and applying a low side switching MOSFET as the controlled switch and a speedy recovery diode as the unrestrained switch connected to the positive DC bus. This function of operation is opposite to the IRS25401 and includes a differential rambling high side current sense circuit, that is utilized to hysteretically control the output current by sensing the voltage drop across a sense resistor and regulating the common to 0.5V. The IRS2980 is ideal for use in current regulated circuits rather than voltage safe circuits.