Novel MinE-CAP device dramatically reduces the input bulk capacitor size, reduces in-rush current by up to 95%, eliminates NTC thermistors and associated losses
Power Integrations announced the MinE-CAP™ IC for high power density, universal input AC-DC converters. By halving the size of the high-voltage bulk electrolytic capacitors required in offline power supplies, this new type of IC enables a reduction in adapter size of up to 40%. The MinE-CAP device also dramatically reduces in-rush current making NTC thermistors unnecessary, increasing system efficiency and reducing heat dissipation.
The MinE-CAP leverages the small size and low RDSon of PowiGaN™ gallium nitride transistors to actively and automatically connect and disconnect segments of the bulk capacitor network depending on AC line voltage conditions. Designers using MinE-CAP select the smallest high-line rated bulk capacitor required for high AC line voltages, and allocate most of the energy storage to lower voltage capacitors that are protected by the MinE-CAP until needed at low AC line. This approach dramatically shrinks the size of input bulk capacitors without compromising output ripple, operating efficiency, or requiring redesign of the transformer.
Conventional power conversion solutions reduce power supply size by increasing switching frequency to allow the use of a smaller transformer. The innovative MinE-CAP IC achieves just as significant overall power supply size reduction while using fewer components and avoiding the challenges of higher EMI and the increased transformer/clamp dissipation challenges associated with high-frequency designs. Applications include smart mobile chargers, appliances, power tools, lighting and automotive.
Housed in the miniature MinSOP-16A package, the new devices work seamlessly with Power Integrations’ InnoSwitch™ family of power supply ICs with minimal external components. MinE-CAP MIN1072M ICs are available immediately from PI offices and franchised distributors and are priced at $1.75 for 10 Ku. Two initial design example reports (DERs) pair the MinE-CAP IC with Power Integrations’ InnoSwitch3-Pro PowiGaN IC, INN3370C-H302. A 65 W USB PD 3.0 power supply with 3.3 V – 21 V PPS output for mobile phone / laptop chargers is described in DER-626, and DER-822 describes a 60 W USB PD 3.0 power supply for USB PD/PPS power adapters using INN3379C-H302.
|65 W USB PD 3.0 Power Supply with MinE-CAP.|
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