Product category:
Power Supply ICs and Controllers
News Release from: Catalyst Semiconductor | Subject: CAT4240
Edited by the Electronicstalk Editorial
Team on 07 June 2007
Boost convertor powers big backlights
LED driver addresses high-power backlighting applications from 1W LEDs in series to multiple strings of lower-power LEDs.
Catalyst Semiconductor has launched a 2W LED driver to address high-power backlighting applications The CAT4240 boost convertor provides a high switch current up to 750mA and high voltage up to 38V, making it ideal for driving a wide range of backlighting applications ranging from 1W LEDs in series to multiple strings of lower-power LEDs
This article was originally published on Electronicstalk on 7 Feb 2002 at 8.00am (UK)
Related stories
Digitally programmable potentiometers to take over
Catalyst Semiconductor has added two new digitally programmable potentiometer (DPP) ICs to its AE2 (analogue EEPROM) mixed-signal product line.
EEPROM provides more secure MPU supervision
Catalyst Semiconductor has expanded its AE2 analogue EEPROM mixed-signal product strategy with the CAT116x series of microprocessor supervisory circuits with serial 16Kbit EEPROM.
The CAT4240 provides 2W of output power from a 3 to 5V supply and up to 6W when configured with a higher voltage, split supply of 9 to 12V.
Additionally, the device is designed with a low-noise, high-frequency switching scheme and contains fully integrated features, which eliminates the need for external components associated with soft-start and overvoltage protection, reducing noise and saving board space.
Many high-voltage boost convertors typically use a simple variable-frequency switching scheme.
This approach results in a wide range of unwanted harmonics, which are not easy to filter or eliminate.
The CAT4240 uses a fixed frequency (1MHz) switching architecture making it ideal for low noise applications.
A high voltage CMOS output stage in the device allows large LED strings (up to 38V) to be accurately biased and regulated from a low voltage input supply while still delivering efficiency levels of up to 87%.
To eliminate excessive "inrush" currents which can occur during initial power-up, the CAT4240 offers an integrated soft-start control.
In the event of an open-LED fault condition, an internal over-voltage protection circuit will place the device into a low-power operating mode restricting the output voltage to safe levels without the need for external circuitry.
Both of these features are fully integrated, eliminating the need for external components and the associated cost and board space overhead.
Designers have a choice of controlling LED dimming in the CAT4240 using a DC voltage, logic signal, or pulsewidth modulation (PWM) signal.
The CAT4240 LED driver is priced at US $0.84 each in 10,000 piece quantities.
Samples are available now.
Projected lead-time for production quantities is currently 6 to 8 weeks ARO.
• Catalyst Semiconductor: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
