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.