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Optoelectronics/Displays??

Supertex PWM controller IC uses low noise boost-buck topology

Posted: 26 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:hv9930? supertex? pwm controller ic? controller icled lamp driver?

The new HV9930 from Supertex is a variable frequency PWM controller IC designed to control an LED lamp driver using a low noise boost-buck (Cuk) topology. This new product also uses hysteretic current mode control to regulate both the input and the output currents, which, according to the company, enables fast transient response (required for PWM dimming) without the necessity for complex loop compensation. In addition, the input current control enables current limiting during startup and output overload conditions, while the capacitive isolation protects the LED lamp from failure of the switching MOSFET.

The HV9930 provides a low-frequency PWM dimming input that can accept an external control signal with a duty ratio of 0 to 100 percent and a frequency of up to a few kilohertz.

Supertex added that an HV9930-based LED driver is ideal for automotive LED lamps and RGB backlight applications with low voltage DC inputs. An HV9930-based LED lamp drivers can achieve efficiency in excess of 85 percent.




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