LED Driver

LED driver

What is LED driver?

Light emitted from an LED (Light Emitting Diode) is directly proportional to the current passing through it. Its implied that we need a constant current to flow through the LED (or a string of LEDs). It is also desirable to be able to reduce the or increase the brightness as per lighting requirement. Imagine a theater, where the lights dim down gradually or flash rapidly. LED drivers do exactly this and a few other things for protection from electrical power fluctuations and thermal effects. Simply put, LED drivers are one-part power supply and one-part current regulator.

While selecting an LED driver, you have to consider the following minimum criteria:

  • LED String Voltage – this is the voltage at which the LED’s turn on, it varies with the LED arrangement in the string.
  • LED String Current – this is the current that has to flow through the LED string to deliver the rated power


GTD Labs’s LED driver

  • High PF, Primary Side Regulation, CV operation, Thermal shut off
  • Isolated SMPS, Low Standby power < 1W
  • Secondary MCU based digital buck LED drive
  • Multiple Protections features
  • Application: Smart Lighting | Street Lighting

Application Areas

Street Light
Street Light


Input Data 
Line Voltage110Vac
Line Current1.0A
Line Frequency60Hz
Min. Mains voltage operational70Vac
Max. Mains voltage operational140Vac
Power Factor (PF)> 0.98
Inrush Current3.0 A
Lightning Surge ProtectionExt. SPD
Output Data
Output voltage range24V to 56V
Maximum open circuit voltage< 60V
Output Current Ripple< 5%
Protections* Thermal Shutoff
* O/P Short
* O/P Overload
* Sense R short
* O/P Diode short
* O/P Over voltage
Special Features
External Interface0-10V
Sensors* 2 Analog
* 2 Digital
Time based Dimming* RTC
* Astronomical Clock
Operation Mode* Communication Slave
* Autonomous