Supertex introduced the HV9919, a pulse-width managed (PWM) controller integrated circuit (IC) designed to drive LEDs using a buck topology. It is well suited for a variety of solidstate lighting applications, such as: industrial, architectural, signage, or decorative lighting; indicator or emergency lighting; and as a general purpose constant current source. The HV9919’s hysteretic control function maintains its output current between a fixed minimum and maximum level at all times, ensuring that the LED current will not change, despite surges in the input conditions. Built-in PWM circuitry in the IC provides true constant color and a high dimming range. Its dimming frequency can be
programmed with a single capacitor. “Supertex’s HV9919 uses high-side current sensing and hysteretic control to accurately regulate output current, ensuring consistency and prolonging LED life,states Ahmed Masood, Vice President of Marketing at Supertex. “Switching frequency of up to 2.0 MHz permits the use of only small inductors and capacitors in circuit design, thereby minimizing space and cost in the overall system and making it ideal for solidstate lighting applications with space constraints and lower voltage requirements.
HV9919 is available in an 8-lead DFN package (HV9919K7-G). It is Green and RoHS compliant. Datasheet: HV9919