LED Driver


As a leading power management IC specialist, Richtek provides complete product lines for LED light fixtures including AC/DC non-isolated, AC/DC isolated, MR16, DC/DC and Linear solution. We also provide different kinds of white LED Drivers.

With high efficiency, excellent current regulation, high power factor, low THD with low BOM cost, Richtek can always help designers to develop a cost-effective LED driver board for this cost sensitive market.

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Basic LED Driver

LED Drivers

LED Drivers will regulate for constant output current instead of constant output voltage, because LEDs need to be driven with certain current for specific light output. Most high brightness LEDs have a forward voltage between 3 ~ 3.5V. Depending on the input voltage and the number of LEDs used in the LED string, the converter can be a buck, boost or buck-boost (for example when the application needs to cater for different LED strings).

When driving high numbers of LEDs like in LCD backlighting systems, multi-string LED drivers are used. In some off- line LED drivers, linear topology is used. Most LED drivers will also include dimming functions, to be able to control the output current, thereby controlling the LED light output.

Key parameters for selecting LED drivers are input voltage, LED string voltage and LED string current, single/multi-string LEDs and dimming.

In LED drivers powered from the AC line, it is also important to know whether the application needs to be isolated or non-isolated, and whether the LED driver needs to fulfill power factor and THD requirements.

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Technical Documents
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Designing Applications with Lithium-Ion Batteries2018/02/01
LED Backlight System and Power Solutions2018/02/01
Programmable Dual LDO Output Voltage and WLED Current with I2C Interface2017/06/08
Automotive Product Selection Guide2016/11/14
Analyzing VIN overstress in Power ICs2016/10/19
Minimizing Light Flicker in LED Lighting Applications2016/07/07
Guidelines for the RT7321 Off-line Linear LED Driver2016/06/21
Single-Stage High Power Factor Flyback for LED Lighting2016/06/21
Richtek Wide Input Voltage Range DC/DC Power Solutions for Industrial, Automotive and LED lighting applications2016/04/08
Design Guidelines for RT7302 and RT7304 PSR LED Driver2016/04/08
Evaluation Boards
TitleLast UpdateShareDownload
RT4531 Evaluation Board2017/12/04
Asynchronous Boost Converter for 10 WLEDs2017/09/04
RT4532 Evaluation Board2017/09/04
RT8498 Step-Down Converter Evaluation Board2017/07/26
RT7306 Evaluation Board2017/07/26
Low cost smart lighting EVB with RF module2017/07/26
RT8497C LED Driver Controller for High Power Factor Applications Evaluation Board2017/07/14
RT8555WSC Evaluation Board2016/12/26
Power MOSFET Integrated High Efficiency BCM LED Driver Controller for High Power Factor Applications2016/12/26
RT8497AGS Power MOSFET Integrated High Efficiency BCM LED Driver Controller for High Power Factor Applications2016/12/26
High Voltage High Current LED Driver Controller for Buck, Boost or Buck-Boost Topology2016/12/26
RT8487 High Efficiency BCM LED Driver Controller for High Power Factor Applications2016/12/26
RT7310 Triac Dimming Bulb (180-264Vac, 75Vout, 180mA)2016/12/26
RT7310 Triac Dimming Bulb (90-132Vac, 75Vout, 180mA)2016/12/26
RT7310 Triac Dimming Bulb (90-132Vac, 72Vout, 120mA)2016/12/26
RT7304 Flyback Bulb 60Vout 130mA2016/12/26
RT7304 Flyback Bulb 45Vout 178mA2016/12/26
RT7304 Buck-boost Bulb 8W2016/12/26
RT7304 Buck-boost Edge T8 16W2016/12/26
RT7302 Flyback T8 18W2016/12/26
Additional Documents
Title Last Update ShareDownload
Power IC Solutions for Portable/Wearable/Battery-Powered Applications 2017/11/16
Non-isolated LED Lighting Driver IC Performance Test Report - RT8487, RT8497 2017/11/16
AC/DC Non-Isolated BCM Floating Buck LED Driver Controller - RT8487, RT8497 2017/11/16
Offline Linear LED Drivers & Application Example - RT7320, RT7321, RT7322 2017/11/16
AC/DC Isolated PSR Flyback Controllers for high Power Factor and low THD - RT7302, RT7304 2017/11/16
Two-Stage MR16/AR111 LED Driver Solutions with Excellent Transformer Compatibility - RT8476, RT8479 2017/11/16
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Design Tool
TitleLast UpdateShare
RT7313 Flyback Design Tool 2017/10/23
RT8458D Design tool (CCM)2017/10/23
RT8458E Design tool2017/10/23
RT8462 Design tool2017/10/23
RT8487 Design tool2017/10/23
Richtek RT7321 Current Waveform Tool2017/10/23
RT7304 Flyback Design Tool 2017/10/23
RT7321 Design tool2017/10/23
RT8458A DC/CC Design tool (CCM)2017/10/23
RT8458A Design tool2017/10/23