Power Integrations has introduced a family of LLC (inductor-inductor-capacitor) power supply ICs that include: controller, high- and low-side drivers, and both mosfets, but not power factor correction (PFC).
Branded HiperLCS, the devices mop up as many as 30 discrete components from more conventional designs and eliminate design tweaking by factory trimming and pre-matching the co-packaged mosfets company spokesman Peter Rogerson told Electronics Weekly.
Mosfet matching to avoid shoot-through is partly responsible for the high (1MHz) maximum operating frequency, he added.
"LLC converters have long been favoured over other high-power topologies for applications such as PCs and server power supplies, TVs and LED, streetlights due to their high efficiency and ability to produce compact power supplies. However, designing with them is notoriously difficult," said the firm. "HiperLCS devices address this challenge by providing all the required functions in a single IC."
Maximum efficiency is claimed to be better than 97% at 66kHz operation, while 750kHz switching leads to small transformers and ceramic rather than electrolytic output capacitors.
Maximum power is achieved at 250 kHz, where 96% efficiency is possible, said Power Integrations.
For a power factor-corrected design based on HiperLCS plus the firm's own PFC chip, claimed total efficiency for a 320W gold-rated PC PSU is 89.7%.
Six devices from 110 to 440W are available, in a 16x8x2mm (plus legs) clip-mounted single-in-line package with a grounded heat pad.
Design software which will set key circuit parameters including dead-time and soft-start is now included in the firm's downloadable PI Xls tool.
