Power Electronics

Semiconductors Showcased at PCIM Span Multiple Applications

At the PCIM Europe exhibition held recently in Nuremberg, Germany, several semiconductor vendors unveiled new power components that address requirements for greater functional integration and higher performance in various consumer and industrial applications. These components, which encompass both monolithic power ICs and modules, address the latest requirements for small size and high efficiency in motor drives, power over Ethernet equipment, ac-dc power supplies, LED lighting, and various other applications.

Infineon Technologies introduced a family of highly integrated intelligent power modules that contain nearly all of the semiconductor components required to drive electronically controlled variable-speed electric motors. The use of variable-speed motors to reduce the energy consumed by home appliances is growing in response to regulatory requirements and consumer demand. Infineon’s Control Integrated Power System (CiPoS) modules enable operation of these appliances at efficiencies up to 94%.

The CiPoS modules incorporate a three-phase inverter power stage with a silicon-on-insulator gate driver, bootstrap diodes and capacitors, and auxiliary circuitry in a compact, fully isolated package. These modules also offer low junction-to-case thermal resistance. For example, the junction-to-case thermal resistance of the IGBTs of the IKCS12F60AA CiPoS module is 3.6°C/W, and of the Em-Con diodes is 4.9°C/W. At a nominal operating voltage of 15 V, this low resistance results in an output current of 6 A.

Infineon also debutted its PrimePACK IGBT modules in the 1200-V and 1700-V voltage classes. These modules also have improved thermal characteristics. Specifically, they incorporate a special layout of the IGBT chips, significantly improving heat distribution.

Power Integrations introduced its TinySwitch-PK, a monolithic power supply controller with a peak power mode that delivers increased power for short periods. Housed in an 8-pin DIP, this chip addresses the many consumer products with motors, buzzers or lights that require extra power in brief bursts. When TinySwitch-PK enters its peak mode, the controller doubles its operating frequency and current limit. In so doing, the controller boosts the power supply’s output to 280% of its continuous rating without requiring any increase in the rating of the transformer or the on-chip MOSFET switch.

Meanwhile, National Semiconductor demonstrated the LM5073, a powered device (PD) controller for Power-over-Ethernet (PoE) applications that require up to 30 W per port. The LM5073 features an adjustable output current level and the ability to interface with any dc-dc converter topology.

This device integrates a programmable interface port and a hot-swap controller that exceeds the standard IEEE 802.af specifications, allowing designers to operate PoE appliances at any power level up to 30 W. For greater flexibility, the LM5073 separates the PD interface from the dc-dc converter to support a wide variety of isolated and nonisolated dc-dc converter topologies.

For offline power supplies, Texas Instruments introduced a single-chip PFC controller IC featuring the company’s Natural Interleaving technology. Using this technology the UCC28060 controller significantly reduces ripple current compared to single-phase or alternative “master-slave” interleaved solutions. Natural Interleaving also enables light-load phase management and distribution of magnetic components to improve thermal management.

Targeting loads ranging from 75 W to 800 W, the UCC28060 also incorporates a failsafe overvoltage protection circuit, which provides dual paths of voltage sensing to protect against shorts to an intermediate voltage. In addition, sensorless current shaping protects the system from potential damage that may otherwise occur during “brown-out” conditions and recovery.

Fairchild Semiconductor introduced the Green FPS e-Series, a family of Fairchild Power Switch (FPS) products that provide high efficiency and system reliability in flyback power supply designs at 25 W and below. These 8-pin devices, which target applications such as DVD players, set top boxes, and LCD monitors, combine a fully avalanche rated SenseFET, a current-mode PWM chip and various protection functions.

Based on Fairchild’s valley switching technique, the Green FPS products raise efficiency by 1% and reduce EMI up to 5 dB compared to hard-switching converter topologies Using burst mode operation, the Green FPS e-Series devices reduce standby power to less than 0.2 W at no load or below 1 W at 0.5-W load. This performance meets requirements established by the California Energy Commission, the EU Code of Conduct, and the Group for Energy Efficient Appliances.

Addressing the green benefits of LED lighting, Zetex Semiconductors unveiled the ZXLD1362 LED driver, which drives up to 16 high-power LEDs with an adjustable output current of up to 1 A. Operating from a 6-V to 60-V supply and achieving up to 95% efficiency, this chip supports a range of flexible LED brightness and thermal management schemes.

The ZXLD1362 integrates a 60-V MOS switch and a high-side output current sensing circuit, enabling LEDs to benefit from ground referenced return paths that are particularly importance in architectural lighting. The chip is housed in a 2.8-mm x 2.9-mm TSOT23-5 package.

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