24 PRODUCT UPDATE Issue 2 2023 Power Electronics Europe www.power-mag.com Available in an SOP-8L package, the AOZ7203AV is a self-powered dual driver IC for driving external high-voltage MOSFETs and can replace two low-side diodes of bridge rectifier. It is suitable for use in adapters for high-end laptops and televisions, as well as power supplies for desktops, game consoles and servers, advises the company. The rectifier features a high withstand voltage, a self-powered Vcc supply from the AC line, low operation current and X-capacitor discharge (CB safety certified). A break-before-make circuit avoids the overlap of two gate driving and an active bridge rectifier circuit drives the low-side, high voltage MOSFETs. Input voltage is up to 600V which ensures a wide operating ambient temperature range of -40 to 125°C, driving low RDSon HV MOSFETs to gain more efficiency improvement of AC power supply. The AOZ7203AV can replace lossy diodes in the bridge rectifier circuit of an AC/DC power supply. “Using the low-Ohmic high voltage external MOSFETs significantly improves the efficiency of the power converter as the typical rectifier-diode forwardconduction losses are reduced by 50%” explains Armin Hsu, power IC senior marketing manager at AOS. “Efficiency can improve up to about 0.7% at 90V mains voltage,” he added. Benefits include drain source over-voltage protection for all external power MOSFETs. There are also space savings, as two drivers in one package enable a more compact design, says the company. The AOZ7203AV is immediately available in production quantities with a lead time of 14 weeks. All products from the company are offered in packages with Pb-free plating and are RoHS-compliant. requirements for building redundant power supplies. They also have stable output voltage even during steep battery voltage fluctuations, with less than 50mV ( ±1%) over the entire frequency band under ISO 11452-2 antenna irradiation testing, reducing the design load for noise counter-measures, says the company. Unlike standard products with an overshoot of almost 1.3V that require a large output capacitor to prevent the rated voltage of downstream devices being exceeded, these LDOs limit voltage overshoot to just 0.1V. As a result, says Rohm, they can support much smaller output capacitors. There is no need for a voltage clamping diode which further contributes to reducing the required board area. It is estimated to be approximately 29% less compared with general solutions and also minimises the number of additional circuits needed to configure redundant power supplies. The BD7xxL05G-C series meets requirements such as support for 125°C (ambient temperature) operation and the regulators are qualified to AECQ100. The LDOs are designed for applications that operate when the engine is stopped, for example, brake systems, body control modules, electric power steering, battery control units, ADAS engine control units (ECUs), real time clocks, drive recorders and door handle modules. The LDOs are in mass production now and available from online distributors, Digi-Key, Mouser and Farnell with other distributors scheduled for later release. The BD7xxL05G-C series comprises the BD725L05G-C, BD730L05GC, BD733L05G-C and BD750L05G-C compact LDO regulators. They are optimised for automotive’s redundant power supplies in systems such as ADAS and a vehicle’s safety systems which reply on redundant power supplies to continue the operation of core functions in the event of a main system malfunction. The regulators are designed for the limited space in a vehicle and feature a rated input voltage of 45V and 50mA output current. The BD7xxL05G-C series LDO regulators measure 2.9 x 2.8mm and provide high withstand voltage up to 45V with low current consumption of 6µA (typical) to meet key AC/DC active bridge rectifier reduces standby power in adapters BD7xxL05G-C series of primary LDOs maintain power for core vehicle functions For efficient cooling in demanding medical and industrial applications, the power supply uses thermal conduction and has a power density of 31.1W per cubic inch. According to the company, this makes it one of the highest power density power supplies in its category for powering medical and industrial applications. It is designed in accordance with safety standard IEC 60601-1, for BF (body floating) medical applications. Its high isolation and creepage distance also make it suitable for industrial applications. It complies with EN61558-2-16 (OVC III) and simplifies design to conform to EN60335. The GHA700F is available in four output voltages: 24V DC / 29.2A, 30 V DC / 23.3A, 48V DC / 14.6A, 56V DC / 12.5A. Universal input voltage is 85 to 264V AC. Output voltage can be adjusted using the built-in potentiometer. The GHA700F is up to 96% efficient. It includes inrush current limitation, over-current protection with automatic recovery when the fault condition is removed, and over-voltage protection. Operating temperature range is -20 to 70°C or up to 80°C chassis. Depending on the final equipment assembly and cooling conditions, a derating may apply, adds the company. The power supply includes an active power factor corrector with a coefficient of up to 0.95. The GHA700F has a 4,000V AC (2MOPP) input to output isolation voltage, Cosel adds 700W model to medical and industrial supply
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