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Thursday, April 09, 2009

TDA5140A Brushless DC Motor Drive - NXP

TDA5140A Brushless DC Motor Drive - NXP

"The TDA5140A is a bipolar integrated circuit used to drive 3-phase brushless DC motors in full-wave mode. "

Features Include -

  • Full-wave commutation without position sensors.
  • Three push-pull outputs: 0.8 A output current.
  • Thermal protection - Flyback diodes
  • Tacho output without extra sensor

AN93014_EIE; TDA5140AT with Position Indicator Page-In & Speed Control - PDF

NXP Semiconductors - NXP - Application Notes

NXP (for Next eXPerience) semiconductor company founded by Philips.

Wednesday, April 08, 2009

LM3445 - TRIAC dimmable offline LED driver

Conventional TRIAC dimmers are designed to interface to a resistive load (halogen or incandescent bulb), while today's LED driver solutions interfaced to a standard wall dimmer produce 120 Hz flicker of the LED and/or do not allow 100:1 dimming.

LM3445 - TRIAC dimmable offline LED driver

The LM3445 provides a constant current for illuminating high power LEDs and includes a TRIAC . The LM3445 contains all the necessary circuitry to build a line-powered (mains powered) constant current LED driver whose output current can be controlled with a conventional TRIAC dimmer.

LM3445 - TRIAC dimmable offline LED driver

Thermal shutdown limits total power dissipation by turning off the output switch when the IC junction temperature exceeds 165°C. After thermal shutdown occurs, the output switch doesn ’t turn on until the junction temperature drops to approximately 145°C

Extra Extra !