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LED driver with PWM eases dimming control

Posted: 04 May 2010 ?? ?Print Version ?Bookmark and Share

Keywords:LED driver? PWM? LCD?

IXYS Corp. subsidiary Clare Inc. has launched the CPC9909 high-voltage HB LED driver that can drive from a few to hundreds of HB LEDs in-series and/or parallel combinations in a constant peak-current control topology.

Manufactured using Clare's 550V BCDMOS silicon-on-insulator (SOI) process, the CPC9909 operates directly off a rectified AC voltage supply, and does not require any additional low voltage supplies. LED brightness can be controlled via the pulse frequency modulation (PWM) or linear dimming inputs.

CPC9909's PWM with a constant peak-current control scheme is inherently stable, thereby allowing the driver to be operated above 50 percent duty cycle without loop instability or sub-harmonic oscillations. LED dimming can be implemented by applying a small DC voltage to the LD pin, or by applying a low frequency PWM signal to the PWMD pin.

"The CPC9909 joins the expanding family of HVICs that our technologists have developed in our own proprietary high voltage SOI process for power management applications. By enabling direct off AC line LED control, we bring cost-effective solutions for the expanding LED general lighting applications and especially for backlighting of large area LCD displays and TVs. The ease of dimming control with DC or PWM inputs allows for digital control using our specialized line of Zilog MCUs with on board PWM outputs," commented Nathan Zommer, CEO of IXYS.

The CPC9909 is well suited for a variety of solid state HB LED lighting applications such as flat-panel display RGB backlighting, signage, decorative, LED lighting, and DC/DC or AC/DC LED driver applications. The CPC9909N is fully RoHS-compliant and available in a standard 8-lead SOIC package, and the CPC9909NE is available in a thermally-enhanced (50C/W thermal resistance, junction-to-ambient) 8-lead SOIC package for higher ambient or power applications.





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