Thursday, June 08, 2017

IRS2980 - LED Driver Control IC - International Rectifier

A high-voltage buck regulator control IC for LED light bulb replacement, LED tube lighting and other non-isolated LED driver applications.First in a family of high-voltage LEDrivIR ICs, and utilizes hysteretic average current mode control for precise current regulation. EOL

IRS2980 - LED Driver Control IC - International Rectifier

IRS2980 - LED Driver Control IC - International Rectifier

Some of the Features - Dimming LED driver controller, Hysteretic Current Regulation, Closed-loop LED current dimming control, Analog/PWM Dimming Input, Internal High Voltage Regulator.

IRPLLED13 - 90-250VAC Offline LED Driver using LEDrivIR IRS2980

Non-isolated constant current buck regulator,  90-250V AC input voltage, 0-50V DC output voltage, Nominal output current of 350mA.

A simple single st age power converter based around the IRS2980 LED driver IC provides a contro lled current output ov er a wide AC line or DC voltage input range.

The IRPLLED13 evaluation board is an off line non-isolated constant current Buck regulator LED driver designed to supply a nominal 350mA DC output current. The LED output voltage can be up to 90% of the input voltage, operating from an AC line input volt age between 90 and 250VAC 50/60Hz. The IRPLLED13 demo board is not de signed for use with dimmers.

Monday, June 05, 2017

ST7LITE09 and LED driver STP16CP05

A cost effective solution to drive an array of high brightness LEDs, using the LED driver STP16CP05. The Brightness and Color is uniform due to current regulation. High efficiency DC-DC converter. Wide Input voltage range - 5 V to 35 V.

STEVAL-ILL003V2 HB 32 LED

 STEVAL-ILL003V2 HB 32 LED

  • DC-DC converter for high efficiency
  • 32 LED matrix driven by STP16CP05
  • LED current regulation
  • Adjustable brightness
  • Animated text capability
  • Adjustable blinking speed
This evaluation board represents a cost effective solution to drive an array of high brightness LEDs, using the LED driver STP16CP05. This driver provides the same constant current for each of its output channels, thus there is no difference in brightness and color between the LEDs.

Friday, June 02, 2017

Constant LED Brightness and LDS8711

The LDS8711 is a fixed frequency current mode boost converter with internal rectifier and cycle-by- cycle switch current limit specifically designed to drive a string of up to 10 White LEDs.

Constant LED Brightness and LDS8711

A Switching Converter Chip with hardly any external components driving a HB LED chain. HB - High Brightness LED. This IC is from IXYS Power Devices.

High efficiency boost converter with the input voltage range from 2.7 to 5.5 V . Drives one LED string with 10 LEDs in series up to 32 mA.
  • 250 mV current sense voltage
  • No external Schottky Required
  • 0.7 MHz Switching Frequency
  • Efficiency greater than 83%
  • PWM LED Brightness Control
  • Low Shutdown Current (<1µA)
LED Current Setting - The maximum current value in the LED string may be factory preset in the range from 10 to 30mAin 0.125mA steps, or set by Smart OneWire interface in the range from 0.125to 32 mA.The average LED string current that determines LED brightness may be controlled applying PWM signal to the EN/PWM pin.

Friday, May 12, 2017

5 Watt LED driver with Zetex - Diodes

The ZXSC400 is a voltage mode boost converter in the SOT26 package. Its low feedback voltage allows the current in a chain of °Cs to be set and accurately monitored with a single resistor giving minimal losses.

ZXSC400 - LED driver boost converter

Shown below is a design from an Application Note of Zetex. Here ZXSC400 drives a Luxeon V Star LED. The input voltage ranges from 4.2V to 5.4 V with a maximum output current of 700mA at 5V input.

5 Watt LED driver with Zetex - Diodes

Voltage mode boost converter in the SOT23-6 package. Its low feedback voltage allows the current in a chain of LEDs to be set and accurately monitored with a single resistor giving minimal losses. Excellent load and line regulation. 1.8V to 8V supply range, regulation of ±1%, 80% efficiency, 4.5µA Quiescent drain.

Zetex range of LED drivers - Diodes Incorporated

LED Drive Solutions and Power Supply Design ideas. Robust and efficient high-brightness LED drivers. Zetex have LED drivers for boost/buck they are cost effective too,

Wednesday, May 10, 2017

SSL2101 SMPS Controller - NXP Semiconductors

The SSL2101 is a Switched Mode Power Supply (SMPS) controller IC that operates in combination with a phase cut dimmer directly from rectified mains. It is designed to drive LED devices..

SSL2101 SMPS Controller - NXP Semiconductors

SSL2101 SMPS Controller - NXP Semiconductors

SSL2101 12W-230V Triac dimmable fly-back demonstration board UM10341

The SSL2101 driver is a solution for a professional application with multiple high power  LEDs that require galvanic isolation and a safe output voltage. It is mains dimmable for  both forward phase (triac) dimmers, and reverse phase (transistor) dimmers.

Triac dimmable fly-back demonstration board UM10341

It can  generate up to 16 W output power, which is equal to a 100 W incandescent lamp (at  63 Lumen/W). Examples are shelf lighting, down lighting and LED lighting for bathrooms  etc. The design demonstrates how to produce a driver that is suitable for small form factor  applications such as retrofit lamps.

Tuesday, May 09, 2017

Solar Cell Voltage Booster with MAX856

This circuit generates an usable power 5V good for charging portables. Even lighting a White LED Array.

A Supercap Flywheel may be good addition to this, these kind of chips can also add supercap power management, as it will take a lot of current to charge up. This will keep power flowing when the sun goes behind the clouds.

Solar Cell Voltage Booster with MAX856

Harnessing Solar Power with Smart Power-Conversion Techniques

"Obtaining all the available energy from a solar panel requires a switch-mode step-up or -down converter and battery charger, in addition to the battery. The converter must ensure that every bit of energy taken from the solar panel is efficiently stored in the battery for future use."

The MAX856-MAX859 are high-efficiency, CMOS, step-up, DC-DC switching regulators for small, low input voltage or battery-powered systems.

Monday, April 03, 2017

Digital Potentiometer - AD5242 - Analog Devices

AD5241 and AD5242 provide a single-/dual-channel, 256-position, digitally controlled variable resistor (VR) device. They have 2-Wire I2C Compatible Digital Interface.

Digital Potentiometer - AD5242 - Analog Devices

They are Analog Semiconductor Replacements for Electromechanical Devices like potentiometer, trimmer or variable resistor.

The Advantage of the latter is low cost and easy to configure and use. The Advantage of the Digital Version is "No moving Parts". hence not limited to things like "10000 operations". Another clear advantage is precision and vibration resistant.

See an Application of this Digipot in a TinyOS hardware magnetometer.. 

Digital Potentiometer AD5242 Magnetometer Application

The temperature stability of 30 ppm/°C and low noise settings is also achieved with SiCr thin film resistor technology. They range from 10K, 100K and 1M Ω End-to-End Terminal Resistances.

Digipots are not for high currents or power, even high voltage and very low resistance values are not for these devices. These are signal control devices. Use it for analog circuits and instrumentation and signal control too.