Simple and easy to Construct 10W White LED PWM Driver Circuit designed by using IC SG3525A. IC SG3525A from On Semiconductor is a pulse width modulator control circuit Offers improved performance and lower external parts count when used in designing all types of switching power supplies.
IC SG3525A operates with voltage Range from 8.0V to 35V. It can oscillate output frequency from 100Hz to 40KHz suitable for most LED Driver circuit design. It has latching PWM feature to prevent multiple pulses. This IC available in SMD and THT packages.
Circuit Diagram
Components Required (BOM)
| 1 | C1, C2, C3 | 10µF | C_0805_2012Metric | 3 | ||
| 2 | R2, R3, R4, R5, R6 | 2.2KΩ | R_0805_2012Metric | 5 | ||
| 3 | R1 | 1Ω | R_0805_2012Metric | 1 | ||
| 4 | D1 | LED | LED_0805_2012Metric | 1 | ||
| 5 | U1 | SG3525 | SOIC-16_3.9×9.9mm_P1.27mm | 1 | ||
| 6 | RV1, RV2 | 100KΩ | Potentiometer_Bourns_3296W_Vertical | 2 | ||
| 7 | Q1 | BC847 | SOT-23 | 1 | ||
| 8 | Q2 | IRFR120 | TO-252-2 | 1 | ||
| 9 | J1 | Screw_Terminal_01x04 | TerminalBlock_Altech_AK300-4_P5.00mm | 1 |
Construction & Working
IC SG3525 used as a 10W White LED PWM Driver. Here oscillator frequency range (fosc) decided by the value of oscillator timing Resistor RT and Oscillator timing Capacitor CT refer datasheet for more information.
In this LED driver circuit one 10 watt white LED connected at +12V to LED pin and output to LED cathode. MOSFET IRFR120 acts as a switching device and drives the LED according to the output from VC pin through Q1 transistor. In this circuit by varying the value of RV1 and RV2 we can adjust the dimming and brightness level of 10W LED.
Printed Circuit Board
10W White LED PWM Driver Circuit Gerber files.
Interactive Board Viewer
