Product category:
Power Supply ICs and Controllers
News Release from: Vishay Siliconix | Subject: SiP12510 and SiP12511
Edited by the Electronicstalk Editorial
Team on 31 May 2007
Convertors boost LED drive efficiency
Two new 1.25MHz current-mode boost convertors are optimised for white LED applications.
The new SiP12510 and SiP12511 devices feature an input voltage range of 2.5 to 6.0V, and output voltages of up to 17V for the SiP12510 and 28V for the SiP12511 Their typical efficiency of 90% is the highest ever achieved for this device type
This article was originally published on Electronicstalk on 17 Jun 2003 at 8.00am (UK)
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For any battery-operated consumer product with a liquid crystal display - such as a digital camera, PDA, cellular phone, or game device - the SiP12510 and SiP12511 provide superior performance to enable image brightness and clarity.
This complete LED driver solution integrates several protection features, including overvoltage protection and a cycle-by-cycle current limit of 0.55A supporting up to three parallel strings of 20mA each.
A thermal shutdown block provides another layer of protection by shutting down the device once the internal temperature exceeds the 165C typical temperature threshold.
To enable full control over LED illumination intensity, the SiP12510 and SiP12511 support both linear and PWM techniques for regulating the LED string current.
A built-in three-phase soft-start function diminishes the required peak current during startup by gradually increasing the switch current limit.
Each device implements a low feedback voltage of 0.1V and a tight switching frequency, resulting in improved conversion efficiency over the full industrial operating temperature range of -40 to +85C.
With their combination of 90% efficiency, less than 1uA shutdown current, and a small footprint, the SiP12510 and SiP12511 are particularly suited for space-constrained, battery-operated, portable applications such as cellphones, PDAs and digital cameras.
Samples of the new SiP12510 and SiP12511 are available now.
Production quantities will be available in Q2 2007, with lead times of 13 weeks for larger orders.
Pricing for US delivery in 1000-piece quantities is $1.08 each.
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