Supertex, Inc. (Sunnyvale, CA) introduces a buck-mode LED driver IC with hysteretic current control and high-side current sensing. The HV9918 is ideal for a variety of solid-state lighting applications, such as low-voltage industrial and architectural LED lighting.
The hysteretic control function of the HV9918 maintains a constant output current to the LED string at all times, regardless of input voltage fluctuations. It drives loads of up to 1.0A at over 90% efficiency, with +/-5% current accuracy from input voltages of 4.5 to 40V. The IC has an embedded FET for cost and parts count reduction.
The RoHS-compliant LED driver provides fast transient load response and eliminates the need for feedback-loop compensation. It is also available in an 8-Lead DFN package (HV9918K7-G).