LED Driver From Supertex Drives a Single Low Current LED Across Wide Input Voltage Range

LED Driver From Supertex Drives a Single Low Current LED Across Wide Input 
Voltage Range 
HV9821 Can Take Wide Input Voltages Ranging From 10VDC to a Universal
SUNNYVALE, CA -- (Marketwire) -- 02/27/13 --  Supertex, Inc. (NASDAQ:
SUPX) today introduced HV9821, a clamped-mode, high-side buck
converter IC for driving a low-voltage LED load at constant current
programmable up to 50mA (or higher, as permitted by power
dissipation, etc.). It is well suited for LED backlighting of
push-buttons, switches and other automation control applications. 
The IC limits peak voltage at its switching output to a level
programmed by connecting an external Zener diode. This feature
ensures a reasonable on-time of the switch, while minimizing the
conduction power loss in HV9821. Power dissipation in the IC can be
maintained below a chosen maximum level by selecting an adequate
voltage clamp level VZ. HV9821 operates with fixed off-time,
programmable externally with a resistor. 
"HV9821 features programmable clamped-mode switching, which provides
single LED operation from a high-voltage input with heat dissipation
in the IC minimized," states Alex Mednik, Application Engineering
Director at Supertex. "To accommodate that, HV9821 is packaged in a
special 19-lead DFN, providing excellent thermal properties and
high-voltage isolation." 
HV9821 is available in a lead(Pb)-free/RoHS compliant 19L (7x5) DFN
package (HV9821K7-G). Samples are available from stock. Lead-time for
production quantities is 4-6 weeks, ARO. Pricing is US$1.05, in 1K
About Supertex
 Supertex, Inc. is a publicly held mixed signal
semiconductor manufacturer, focused in high voltage analog and mixed
signal products for use in the medical, LED lighting, printer and
display, industrial and telecommunication industries. Supertex
product, corporate and financial information is readily available at
Corporate Headquarters:
Christine Mahiya
Manager, Marketing Communications
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