EPN December 2012 - (Page 14)

automotive electronics Multiple-Output Regulator ICs trio of management devices feature 2.2MHz switching Easy-To-Use 24V Power Amplifier replicates car-quality audio in heavy vehicles T hree automotive power management ICs from Allegro MicroSystems Europe use an internal 2.2MHz, constant on-time, buck pre-regulator to supply the regulated outputs that are commonly used in automotive CAN buses. The devices are intended for use in bias supplies within control units in vehicles, namely for electronic power steering, transmission control, anti-lock braking and for emissions control. The first IC is the A4407. It supports four regulated outputs: a 5V linear regulator, a 5V tracking/protected linear regulator, a 3.3V linear FET controller/driver and an adjustable linear regulated output. The A4405 is the second power management IC, which supports three regulated outputs: a 5V linear regulator, a 5V tracking/protected linear regulator, and a 3.3V linear FET controller/driver. The third variation of the trio is the A4406. This model supplies a 5V tracking/protected linear regulator and a 3.3V linear FET controller/driver. The 5 V protected output of the A4405 and A4406 tracks the 3.3 V output, while the A4407 provides a pin to set the master reference for the 5V protected tracking regulator to either the 3.3 V or the second 5 V output. Protection features include under-voltage, lock-out, pulseby-pulse current limit, LX short-circuit protection, and thermal shutdown. In the case of a shorted load, all linear regulators feature foldback over-current protection and the 5V output is protected from a short-to-battery event. All three devices feature both a logic level and a high-voltage (current and voltage-limited) enable input. They also integrate a power-on reset output with adjustable delay for microprocessor control. Two devices, the A4405 and A4406, are offered in a 20pin TSSOP while the A4407 is offered in a 24pin TSSOP. Both package versions have an exposed thermal pad, identified with the suffix LP, for enhanced thermal dissipation. Allegro MicroSySTeMS 14 R unning at 24 rather than 12V, the TDA576B is the market’s most powerful and most simple-to-use audio power amplifier for commercial vehicles, claims STMicroelectronics. In commercial vehicles, lorries, buses and agricultural vehicles, which use electrical systems running at 24V rather than 12V, the amplifier can drive the cabin loudspeakers directly, with external components. Audio amplifiers must withstand the demanding automotive environment, including a high level of electrical noise and protect against short circuits, load dumps, and excessive chip temperature. The 24V audio amplifier uses BCD5 manufacturing technology that allows a single chip to include both the power blocks and the signal management blocks. It can sustain a peak supply voltage of 60V. STMicroelecTronicS www.epn-online.com/search?search_keyword=48960 LED Backlight Can Be Shaped for soothing and natural lighting in vehicles P roviding flexible, customisable and shapeable options, the QuantumBrite Shapeable LED backlight allows holes to be cut into it in any shape required, says Lumex. It provides a brightness of up to 20cd/m2 suitable for devices that require non-jarring, soothing and natural lighting. The ultra-thin backlight viewing area has a profile height of 0.125mm, suitable for compact portabledevices and for use on both flat and curved surfaces. The LED backlight can be used in clothing and fashion accessories; appliances such as logo illumination; automotive lighting such as switch and dashboard illumination; medical equipment such as display backlighting on medical radiology equipment and monitors and in industrial control equipment such as automatic meter reading and drive control displays. luMex www.epn-online.com/search?search_keyword=49059 December 2012 – epn issue n° 12 www.epn-online.com/search?search_keyword=48850 http://www.epn-online.com/search?search_keyword=48960 http://www.epn-online.com/search?search_keyword=49059 http://www.epn-online.com/search?search_keyword=48850

Table of Contents for the Digital Edition of EPN December 2012

Cover
Contents
Altera
Taiyo Yuden Europe
Editorial Comment
Digi-Key
On the Web
Digi-Key
New Products
Syfer Technology
EPN
Fox Electronics
Automotive Electronics
Digi-Key
Power Perspective
Microchip
EPN Forum Review
RFID/NFC
Embedded World 2013
Passives
Industrial Automation
Digi-Key
New Products
Renewable Energy
Digi-Key
Test Corner
New Products
RF&Wireless
Digi-Key
40th Anniversary Interview
Distribution Spotlight

EPN December 2012