The reason for this is that at this operating point the conduction losses reach the maximum, resulting in a poorer overall efficiency compared to high input-line conditions. Minimum input voltage (typically 90 Vac).Typically, for chargers and adapters with universal input range (90 Vac-264 Vac) the most critical operating point to meet the minimum efficiency requirement is at: It is evident that to increase the power density above 20 W/in3, the converter efficiency must be above 92.5 percent. The picture shows the relationship between power density and the minimum efficiency required to keep the adapter case temperature below 70☌ for a 65 W adapter.
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In a completely enclosed USB adapter, any size-reduction through high switching frequency or package innovation must go hand in hand with efficiency improvements to maintain low component and adapter case temperatures. BOM cost reduction can be achieved as the parts are fully driven from 4.5V (low threshold voltage) by minimized on-state resistance, low gate, output and reverse recovery charges. OptiMOS™ PD is an N-channel power MOSFET family meeting highest efficiency standards even in a compact 3x3 package, achieves a lower temperature in a 3x3 package compared to the next best alternative in 5圆. OptiMOS™ PD optimized for Sync Rectification Check the reference design schematics for a 45W USB power delivery solution. The XDPS21071 is a digital PWM controller for high-density adapter applications based on DCM flyback topology. Its feature set includes a robust fast body diode, up to 2kV ESD protection, and low EMI.įorced frequency resonant flyback controller for high-density adapters The 600V CoolMOS™ PFD7 is dedicated to ultrahigh power density designs and offers up to 1.17 percent efficiency increase compared to the CoolMOS™ P7 technologies, which leads to a power density increase of 1.8 W/in 3. SOT-223 offers a smaller footprint while being pin-to-pin compatible with DPAK while achieving similar thermal performance. 700 V CoolMOS TM P7 is a tailored technology optimized for flyback and DCM (discontinuous current mode) PFC applications. The named power converters are typically based on flyback topologies. This product addresses the low power SMPS market where it tackles common barriers through excellent performance and ease-of-use. The 700 V CoolMOS™ P7 offers a price competitive solution for consumer applications such as chargers and adapters in the power range from 10 W to 75 W. low power cases such as headsets vs a laptop being a high power case).ĭiscover the reference designs, boards, and design support documents.ġ0W to 75W converter designs based on flyback topology or DCM PFC topology Each device is supplied only the power it requires (e.g. In this way, power management across multiple peripherals is optimized. A critical component of delivering higher power is the use of e-marked USB cable which will support 5A.
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the source and the host exchange their requirements to figure out how much power to transfer. Essential is the communication of a suitable Power Rule, i.e. In addition to faster charging, this USB standard enables both host and peripheral devices to provide power, the power direction is no longer fixed. Making use of the highest power modes also requires specially rated USB cables, as standard cables are only rated for 60W at most. In other words, it enables increased power levels from existing USB standards with support for >100W.
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#Power converter and adapter for type n p portable#
The specification caters to much higher power ratings than typical smartphone-based charging designs, as it is intended to power hard drives, printers, and displays, as well as larger portable electronics like laptops. The USB-C PD standard (USB-C power delivery) allows the device to charge quickly via a USB connection.