App note from Richtek on their RT8487 compact buck-boost LED driver. Link here RT8487 is a boundary mode constant current controller with internal high side driver, which can be used in buck and buck-boost configuration, to provide a constant output current to the (LED) load. It contains special circuitry for achieving high power factor and […]
Tag Archives: LED driver
App note: AL8860Q LED driver remote mounting and LED open/short to GND protection solution
App note from Diodes Incorporated on their AL8860Q LED driver with built-in faults protection. Link here (PDF) The AL8860Q is a hysteresis mode DC-DC buck LED driver, designed for driving single or multiple series connected LEDs in automotive lamps. In some circumstances the LED string should become in fault status such as open-circuit, short-circuit, LED […]
App note: White LED driver with digital and PWM brightness control in 2mm x 2mm QFN package
An application note from Texas Instruments, white LED driver with digital and PWM brightness control (PDF!): With a 40-V rated integrated switch FET, the TPS61160/1 is a boost converter that drives LEDs in series. The boost converter runs at 600kHz fixed switching frequency to reduce output ripple, improve conversion efficiency, and allows for the use […]
Simple LED driver/constant-current source 20 mA
Another Instructable by Jan Henrik, a constant-current source which gives 20mA at the output. He writes: It is a circuit, which limits the current to 20mA, what allows us to drive any normal led, without calculating a resistor, you can just plug the led in and see it emitting light… Also this allows us to test […]
App note: High power LED driver with PIC12F675
A current controlled buck converter for driving high-power LEDs. The PIC12F675 microcontroller has an integrated comparator, which in combination with a low pass filter provides a control circuit for the SMPS. The circuit is based on a buck topology switching power supply using the on-chip comparator peripheral within the PIC12F675 microcontroller. The switching power supply […]
App note: High power triac dimmable LED driver
A 20 Watt Triac dimmable LED driver. This is basically a current controlled step-down switching power supply. The circuit is powered directly from mains so be careful with this one.
MSP430 based 32 LED driver
Parker designed a MSP430 based 32 LED driver. His intends to use it as a VU meter, by reading a ADC line with the uC and turning LEDs on and of depending on the calculated VU level. Finished the VU. Changed the name to a 32 LED Driver as that is what it really is. […]
App note: Current controlled boost driver for long LED strings
This reference design from Maxim is a current controlled boost driver designed for long strings of LEDs. Driving many LEDs in series has advantages over driving them in parallel. In a parallel configuration each LED will need it’s own current limiting resistor or current control, while the series LEDs make use of a single current […]
A Larson scanner just in time for Halloween
Here’s a project for Battlestar Gallactica fans. Mike developed a Larson scanner, or popularized by the scanning eye of the Cylons. The effect is done by fading LEDs with pulse-width modulation to produce the TV show’s hallmark effect. Via the contact form.
Chip powers LED lamps in MR16 halogen bulb systems
This driver is used in LED replacement lamps for MR16 halogen bulb sockets. It’s compatible with common dimmers: The MAX16840, an LED driver that employs a proprietary architecture to ensure flicker-free, dimmable operation with electronic transformers and cut-angle dimmers. Maxim’s patent-pending approach enables the design of retrofit LED lamps that can replace halogen MR16s without […]
TI intros 16-channel constant current LED driver
Texas Instruments has introduced the TLC59282, a 16-Channel Constant Current LED Driver with 4-Channel Grouped Delay. According to the datasheet, this 24-pin SSOP device allows control of each channel individually controlled via a simple serial communications protocol that is compatible with 3.3 V or 5 V CMOS logic levels, depending on the operating VCC. Once […]
PROTOTYPE: Ethernet LED driver
We’re releasing a stalled or abandoned prototype every few days while Seeed Studio is on break. We put a lot of work into these projects, but they’re still missing major components and testing. If an abandoned project sparks your interest, we may have PCBs to get you started. The goal of this project is to […]