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Digitally-enhanced power controller; conversion, measurement & management

Digitally-enhanced power controller; conversion, measurement & management

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By Graham Prophet



The single-chip MCP19122/3 controls DC-DC converters and is accepts a high-voltage input up to 42V while simultaneously regulating a wide output voltage range of 0.3V to 16V without any external components or drivers. An internal PIC microcontroller in the MCP19122/3 can dynamically adjust the operating frequency, over- and under-voltage lockout thresholds, current limits, soft-start, voltage or current output setpoints and maximum duty cycle. MCP19123 can dynamically adjust the voltage output to meet USB Power Delivery requirements, while also adjusting the output over-voltage lockout to maintain tight protection limits corresponding to each output voltage level.

 

The MCP19123 buck controller incoporates a programmable differential input amplifier used to optimise performance and minimise system voltage error. This configurability allows for a wide output voltage range commonly seen in USB power and battery-charger applications. Improving integration in larger systems, the device can synchronise to an external clock and voltage reference, or provide the internal system clock and reference to other devices for synchronisation. In server or communications equipment, this allows for seamless power-up and accurate tracking of power consumption throughout the board.

 

For high-power applications, multiple outputs can operate in parallel providing system redundancy for improved system reliability. There is an on-board programmable diagnostic and fault detection capability. This device offers accuracy for an adjustable output power supply and can maintain an initial 0.5% or better output voltage accuracy. In addition to the tight voltage regulation, the MCP19122/3 is designed to deliver current measurement by using a lossless inductor current-sense method with specialised internal measurement calibrations. The device can directly accept a common-mode signal up to 16V and report the load current to within 5% accuracy for most applications, with an emulated average current mode control for hardware-based cycle-by-cycle current limiting.

 

The devices are supported by Microchip’s suite of programming and development tools including MPLAB X Integrated Development Environment (IDE) and the MPLAB XC8 complier. The MCP19122 is in a 4 x 4 QFN package; the MCP19123 in a 5 x 5 QFN package.

 

Microchip; www.microchip.com/wwwproducts/en/MCP19123

 

 

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