Product category:
Power Supply ICs and Controllers
News Release from: Zetex | Subject: ZXSC400
Edited by the Electronicstalk Editorial
Team on 27 November 2002
Convertor ensures accurate LED driving
Used with a high-efficiency switching transistor, the Zetex ZXSC400 voltage-mode boost convertor IC enables the current in an LED chain to be accurately set and monitored by a single resistor.
Used with a high-efficiency switching transistor, the Zetex ZXSC400 voltage-mode boost convertor IC enables the current in an LED chain to be accurately set and monitored by a single resistor Across the full supply range of a lithium-ion cell, the ZXSC400's excellent load and line regulation means that LED current typically changes by less than 1%
This article was originally published on Electronicstalk on 24 Jul 2008 at 8.00am (UK)
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Making the solution a highly scalable one, the use of Zetex switching transistors with ratings of up to 40V, on the boost convertor output allows up to eight LEDs to be chained in series for the best possible LED current matching.
The ZXSC400's 1.8 to 8.0V supply voltage range makes it suitable for use with all common portable equipment battery options.
The typical efficiency of the SOT23-6 packaged boost convertor is 80% over a wide range of output current.
At 4.5uA, the current consumed by the device in shutdown mode makes it well suited to battery powered applications.
For applications driving up to four LEDs, the use of the ZXSC400 with a Zetex NPN transistor and Schottky diode combination in a 3 x 2mm micro leaded package also ensures that external component count and PCB space requirements are kept to a minimum.
The ZXSC400 voltage-mode boost convertor supports a wide range of lighting applications including general LED backlighting and driving from a battery source, white LED backlighting for colour LCD panels and high-performance white LED flashlights.
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