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EETE JULAUG 2015

Power factor correction ICs target light-load performance Power Integrations’ HiperPFS-3 family of power factor correction ICs provides high power factor and high efficiency across the entire load range, and use 60 mW at no-load. For applications with continuous power demands up to 405W for universal input and 900W for high-line, the ICs feature efficiency levels of better than 95% from 10% load to full load and consume less than 60 mW under no-load conditions. A power factor of above 0.92 is achievable at 20% load. The highly integrated HiperPFS-3 devices include the variable frequency CCM controller, high-voltage power MOSFET and a Qspeed low QRR boost diode. The new devices also employ an innovative means of controlling EMI without adversely affecting power factor at light loads. Poor system power factor at light load is caused by X capacitors that are used to reduce differential mode EMI being fed back to the AC line. HiperPFS-3 ICs incorporate a digital power factor-enhancing circuit that activates during light load conditions; this increases the compensation to overcome the reactance of X capacitors in the EMI filter, minimising the phase angle difference between the input voltage and the current. Consequently, designers may increase the size of the X capacitors while minimising or eliminating differential-mode chokes, thereby reducing EMI without degrading light load power factor performance. This results in a smaller, lower cost, EMI filter stage. Available for both high and low-line applications, HiperPFS-3 ICs cover a continuous output power up to 900W. Thermally efficient eSIP-16 packaging simplifies heat sink mounting. Power Integrations www.power.com Compact driver IC for automotive throttle control TB9051FTG provides high efficiency and ultra-low ON resistance in its intended function as a small-sized motor driver IC for DC brushed motors. While primarily targeted at vehicle engine applications, such as electronic throttle and valve control, the IC is also suitable for control of on-board systems operating at up to 5A, such as control of wing mirrors and locks for car boots (trunks). The TB9051FTG is a single channel H-Bridge that supports two power supplies (VBAT and VCC). In addition to forward, reverse and brake functions, it is also capable of PWM control, current limit control and usable for highside current monitoring, diagnosis output and power on reset (POR) circuitry. The new device provides efficient operation in a P-QFN28 package (6 × 6mm). On-resistance is 0.34Ω (high-side + low-side, max). The TB9051FTG applies DMOS transistors as driver elements. The IC also uses various built-in failure detection features for functional safety. These include over current, over heat, low voltage and high voltage detection circuits. The TB9051FTG has an operational voltage range of VBAT=4.5V to 28V and VCC=4.5V to 5.5V. Toshiba adds that it has carried out a variety of testing on the TB9051FTG to simulate various system failures and will provide customers with documentation to support safety analysis and design. Sample shipments will begin in September 2015, with mass production scheduled to commence in October 2016. Toshiba Electronics Europe www.toshiba.semicon-storage.com 2.8” diagonal QVGA TFT panels on-demand Display interface specialist andersDX has launched a new range of 2.8” diagonal QVGA TFT panels available with low Minimum Order Quantities (MOQs), following the negotiation of an exclusive agreement with an Asian supplier. “We have identified that competitors are either discontinuing or applying large MOQs to this size. Whilst some customers are indeed migrating to larger sizes, our competitors move is in our view premature, and leaves smaller customers with established products exposed. They face an unpalatable choice between committing to taking a large stock with the associated cash flow implications or redesigning their product”, commented Paul Hooper, European Sales Manager of andersDX. “Using our close relationships with key suppliers, we have responded by negotiating an agreement under which they will commit to tooling for this display size and format. As a result, we can continue to supply the market with minimum order quantities of just 1000 pieces. This is a great example of the kind of pro-active support that a strong display specialist is able to offer the market.” The 2.8” diagonal QVGA TFT panels are offered with or without a touch screen overlay. The displays themselves draw just 4mA from a 3V power supply. The LED backlight is powered from a 13.2V supply and draws 20mA. andersDX www.andersdx.com 25x32mm brush DC motors deliver from 0.027 to 0.034Nm continuous Pittman Motors has introduced the DC032A Series of brush DC motors, a high torque density motor designed in a rectangular package. Designed for portable equipment and power tools, the motor body cross section measures a compact 25x32mm. It is available in three motor lengths with continuous torque from 0.027 - 0.034 Nm. The DC032A series has a maximum speed of 6500 rpm and can be used with DC bus voltages up to 48 volts. There are 8 standard winding variations to suit most every project. Custom windings are available to further maximize exacting end-product requirements. The motor construction features a high-energy, 4-pole stator with rare earth magnets. The 13 slot commutation design minimizes torque ripple. The armature slots are skewed for optimum reduction of reluctance torque (LO-COG). The motor shaft is supported by shielded ball bearings that are preloaded for low vibration and quiet operation. Pittman www.Pittman-Motors.com 48 Electronic Engineering Times Europe July-August 2015 www.electronics-eetimes.com


EETE JULAUG 2015
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