“With the higher-power NV6128, we extended the effective power range to 500W for the consumer market and look beyond that to multi-kW data centre, e-mobility and new energy applications,” said company CEO and founder Gene Sheridan.
According to Navitas CTO Dan Kinzer, switching at 200kHz in a “modern high-speed totem-pole” architecture, the device can yield a complete 300W PSU at >1.1W/cm3. “When you crank up the speed to MHz+, you get another major step-increase in power density,” he said.
The chip runs from 10 to 24V and over case temperatures for -40 to 125°C. The gate driver is integrated – controlling the crucial parasitics between driver and gate. Control need to be through a separate microcontroller, DSP or other integrated circuit.
For example, inside Oppo’s ~80 x 40 x 10mm 50W SuperVooc charger are a pair of Navita’s earlier (170mΩ) NV6115 ICs plus a TI UCC28782 active clamp fly-back controller switching at ~500 kHz and an On Semi NCP51530 level-shifter-driver.
The company refers to its products as ‘monolithic’ and, although not stated explicitly, the switching transistors seem to be enhancement-mode HEMTs, referred to it as ‘eMode FETs’.
Although rated for 650V, NV6128 can handle <100µs non-repetitive 800V surges (from start-up or line interruption) and <100ns repetitive 800V spikes (from leakage inductance).
Packaging is 6 x 8mm PQFN package with integrated cooling pad.
200-500W applications are foreseen in all-in-one PCs, TVs, game consoles, gaming laptops and chargers for e-scooters and e-bikes.
Branded ‘GaNFast’, Navitas power ICs have been used in fast chargers by companies including Lenovo, Dell, Oppo and Xiaomi, with over 13,000,000 parts shipped, claimed CEO Sheridan.