Power Supplies

A letter to Arm shareholders, signed by the CEO and CFO, reports on Arm’s calendar Q3 (fiscal Q2) performance – the first quarter since it returned to the public equity market. A summary reads: ‘Revenue increased 28% year-over-year, topping $800 million for the first time.’ ’ The better than expected revenue was driven by multiple high-value long-term license agreements signed ...

Rohm has introduced a nanosecond gate driver for GaN power transistors, aimed at lidar, dc-dc converters and Class-D audio. “It is ideal for high-speed GaN switching, with a minimum gate input pulse width of 1.25ns,” according to the company. “As GaN devices are sensitive towards gate input over-voltage, Rohm has developed a method to suppress gate overshoots and has implemented ...

Toshiba is aiming at pumps, air conditioning and fans with through-hole versions of its latest 600V three-phase brushless dc motor drivers. TPD4163K and TPD4164K come in a 32.8 x 13.5 x 3.525mm ‘HDIP30′ package, which has pins on a 1.778mm pitch (Electronics Weekly has asked why this odd pitch was chosen – watch this space). “This new package reduces PCB ...

Designed for work in circuits with varied voltage levels. Until recently, a very common problem faced by electronic circuit designers was the difference in supply voltage standards between microcontrollers (e.g. 3.3 V) and peripheral ICs (e.g. 5 V). In order for them to operate together, the use of additional voltage translators was required, which made the device more complicated and ...

Cosel has used GaN transistors, planar magnetics and a modified fly-back topology to shrink a family of dc-dc power supplies. Called the TE series, the new supplies come in 45W (TECS45F and TEPS45F) and a 65W (TECS65F or TEPS65F) forms. TEPS versions have connections brought out to PCB pins and have a 1 x 2.3inch footprint, while TECS parts (right) ...

Power Integrations has introduced a 1,250V GaN version of its Innoswitch family of off-line constant-voltage constant-current quasi-resonant fly-back switcher ICs, making the options: 725V silicon, 750, 900 or 1.25kV GaN or 1.7kV silicon carbide. These are multi-die devices in a single package, with synchronous output and a proprietary inductive isolated feedback technique using bond-wires. The new devices have been dubbed ...

Diodes has is aiming at automotive LED strings with a boost and SEPIC (single-ended primary-inductance converter) controller, that can also be wired as a voltage regulator. Called AL8853AQ, it is qualified to AEC-Q100 and implements current-mode and fixed-frequency (400khz) PWM control. Slope-compensation is included to prevent sub-harmonic oscillation at duty cycles >50%. The IC requires an external n-channel power switching ...

Toshiba has launched a 200A 40V 0.66mΩmax automotive grade n-channel mosfet that can handle 600A pulses in a 7 x 8.44 x 2.3mm gull-wing package. “Automotive safety-critical applications such as steering, braking and autonomous driving systems generally require more devices than other systems to meet redundancy requirements. Here, a power mosfet with high current density is required due to the ...

Rohm has developed a range of five 100V dual mosfets for single-phase or three-phase bridges in fan motor drives. Four of them are dual n-channel in 5 x 6mm or 3.3 x 3.3mm packages, and one has one n-channel and one p-channel mosfet in the same 5 x 6mm package. “Recent years have seen a transition to higher voltages from ...

Powerbox has announced a ruggedised 1,200W ac-dc power supply for ground-based defense applications and harsh industrial environments. Called OFD1200A and suitable for use inside sealed enclosures, it has a metal chassis and requires cooling by conduction though its baseplate – which needs to be maintained between -40 and +95°C (derating applies sometimes – see the product manual). Shock and vibration ...