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EETE APR 2014

Power film capacitors suit PFC and AC filtering Featuring a dual safety system, FLB Series capacitors exhibit high contact reliability, high ripple current, and extremely high dielectric strength, as well as offering higher rated voltages than comparable technologies. AVX’ FLB series medium power film capacitors come packaged in a cylindrical aluminium can with terminals that enable direct, threephase, internal wire connection. FLB series capacitors are fabricated with metallised polypropylene dielectric combined with a soft polyurethane resin. They feature a dual safety system consisting of an overpressure disconnector and self-healing technology, as well as exhibiting high ripple current and extremely high dielectric strength in operating temperatures spanning -40°C to +80°C. Applications for the series include: power factor correction and output AC filtering in power converters, UPS systems, solar and wind inverters, and motor drives. The FLB series of three-phase, medium power film capacitors are available in nine case sizes, six voltages spanning 230-690VAC, capacitance values spanning 3*20.3μF to 3*335μF, and three capacitance tolerances (±5%, ±10%, ±20%). Optimised for AC voltage performance, the series also exhibits high overvoltage capabilities as a result of its self-healing properties. Unlike aluminium electrolytic capacitors, FLB series polypropylene capacitors do not have a catastrophic failure mode, they simply experience a parametric loss of capacitance of about 5%. AVX http://avx.com Programmable clock generator has phase jitter under 0.7ps Integrated Device Technology has added the 5P49V5901 to its VersaClock 5 family of programmable clock generators, offering four universal output pairs capable of producing independent frequencies up to 350 MHz in various output types. The in-system programmable device consolidates four differential or eight single-ended clock generators, and can store up to four different configuration settings, helping to minimize board space and bill-of-materials. With RMS phase jitter less than 0.7 picoseconds over the full 12 kHz to 20 MHz integration range, the new device meets the stringent jitter requirements of PCI Express Gen 1/2/3, USB 3.0, and 1G/10G Ethernet. The high-performance clock generator operates at less than 100 mW core power (50 percent lower than competing devices), helping to ease system thermal constraints, reduce operating power expenses, and maximize battery life. The 5P49V5901’s four universal output pairs are each independently configurable as HCSL, LVPECL, LVDS, or dual LVCMOS outputs. The fractional output dividers driving each output pair are programmed via I2C while the device is operating in the system, lending itself to system tuning and margin testing. Unlimited in-system reprogramming is possible, four banks of one-time programmable non-volatile memory provide flexibility for multi-project inventory consolidation. Integrated Device Technology www.IDT.com NFC Z-axis antenna is only 3.2mm high With a profile less than 3.2mm high, the ZC1003HF Series Z-axis antenna is well suited for slim smartphone designs. It improves communication distance for near-field communication applications such as cashless payment, physical access, driver identification, peer-to-peer file sharing, and credential storage and exchange. The highly sensitive solution measures only 10x10x3.1mm, it requires less board space compared with PCB printed loop antennas, and offers up to 30% longer reading distances, claims manufacturer Premo. The ZC1003HF series is offered with 2,5μH/13,56MHz inductance value and can be taylored according to customer’s specifications. The antenna includes a high performance NiZn ferrite core material (>106 Ohm·m) and low initial permeability to work at high frequency. It provides a very stable performance in a wide range of temperature from -40ºC to +100ºC. The antenna offers better performance over metal parts ground planes or batteries devices. Its surface mount (SMD) and tape and reel packaging configuration allows an easy integration in an automatic printed circuit board assembly process, avoiding handling of the piece that could damage winding wire of the piece. Premo www.grupopremo.com Forward controller simplifies high-voltage control in vehicles Reducing both size and complexity of the power supply circuitry, the LT3752 synchronous forward controller from Linear Technology is ideal for automotive HV / HEV applications. An optocoupler is not required. The device is a high input voltage capable synchronous forward controller with active clamp transformer reset. A controlled VOUT start-up and shut-down is maintained using an integrated housekeeping controller to bias both the primary and secondary IC’s. The internal bias generation also reduces complexity and size of the main power transformer by avoiding the need for extra windings to create bias supplies. The LT3752 operates over a broad input voltage range from 6.5V to 100V. For up to 400V inputs and greater, Linear provides the LT3752-1 which allows RC start-up from the input voltage with the maximum voltage limited only by the choice of external components. An output voltage regulation of ±5% can be attained without the use of an optocoupler. When an optocoupler is used, ±1.5% regulation can be realized. The LT3752/-1 sends a control signal via a pulse transformer to a secondary-side MOSFET driver for the synchronous rectification timing. With the LT3752/-1, secondary side ICs no longer require start-up circuitry to operate when the output voltage is 0V, allowing a controlled VOUT startup. The LT3752/-1 contains an accurate programmable volt-second clamp. When set above the natural duty cycle of the converter, it provides a duty cycle guardrail to limit primary switch reset voltage and prevent transformer saturation during load transients. Linear Technology www.linear.com 48 Electronic Engineering Times Europe April 2014 www.electronics-eetimes.com


EETE APR 2014
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