Power Supplies

STMicroelectronics is has chosen an isolated buck converter topology for a 10W dc-dc converter that provides a regulated local primary power rail, plus a moderately regulated isolated secondary power rail. The secondary output, it said, is suitable for powering isolated IGBT, SiC or GaN gate drivers. The IC is called L6983i, and it can operated from inputs across 3.5 – ...

Oriental Motors has introduced sinewave drive vector controllers for its 30 and 50W brushless dc motors, improving speed tracking, reducing audible noise, increasing peak torque (15% for 30W types and 20% for 50W) and adding functions compared with the earlier BLH series of squarewave controllers. The new controllers are called BLH2D (in photo right). “Adopting vector control as the motor ...

Nexperia has introduced a 10A 650V silicon carbide (SiC) industrial Schottky diode in a 2pin through-hole TO-220 plastic package. Called PSC1065K, the company is not making its full data sheet public – the data brief reveals 22nC total capacitive charge (Vr=400V, 200A/μs, Tj=150°C), but not forward voltage. Editor’s note, this did read 15nC – taken from the data brief which ...

Infineon has introduced automotive high-side power switches for safety-critical circuits. ‘Load Guard 12V’ dual and single-channel are available with nominal current carrying of 2 or 3A, making four devices in total. Without the host MCU getting involved, a pad is provided (OCT in diagram right) for an RC network that can modify the level and timing of current limitation above ...

Rohm has developed four and six channel automotive LED drivers for 5 – 10in+ backlights behind displays and instrument clusters. The parts (table below) include 20,000:1 PWM dimming and dc dimming in a way which “eliminates flickering when changing display brightness from low to high”, according to the company. Switching can be between 200kHz and 2.4MHz, and operation is over ...

Wise-integration of France and Powernet of Korea have teamed up to bring digital control to gallium nitride-based power supplies. They will “combine their technologies and products to deliver small and energy-efficient components for power-supply applications that are currently limited to analogue control”, according to Wise, which argues: “It is very difficult for power-supply manufacturers to go above switching frequencies of ...

At APEC in Florida, Texas Instruments introduced a family of ICs designed to shrink the size of EMC anti-emission common-mode filters in single and three-phase mains and automotive power converters. In principal, the ICs implement a capacitance multiplier circuit to emulate the Y-capacitors in a conventional passive filter design. They do while sitting amongst smaller filter inductors and capacitors (top ...

Autronic has created an 80W dc-dc power supply for on-board railway use, which produces 12V (adjustable) from supplies between 14.4 and 154V, covering “all international on-board voltages from 24V to 110V in a single device”, it said. Dubbed HFBC80-W/Ks, output voltage is adjustable, and devices can be connected in parallel for more current. Efficiency can reach 92%. The units measure ...

Power supply component failures are perhaps the most common malfunctions affecting electronic devices. This is due to several reasons. First of all, the systems supplying current to the rest of the circuit are directly exposed to all kinds of input interferences – voltage surges, power shortage, etc. Another reason is the use of poor quality components in stabilizers and converters ...

Diodes has introduced silicon carbide mosfet rated at 1,200V and 37A for industrial motor drives, solar inverters and electric vehicle battery chargers. Dubbed DMWS120H100SM4, its packages transfers heat at 0.6°C/W “making it well-suited for applications running in harsh environments”, according to the company, Rds(on) is typically 80mΩ (Vg=15V, 100mΩmax) and gate charge is typically 52nC (-4/+15Vg, 800Vd, 20Ad). Its 37A ...