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  • MCP19114 Flyback Stand-Alone

  • Created: Jun 02, 2016

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The MCP19114 is a power analog synchronous low-side PWM controller that operates from 4.5V to 42V. It has an analog circuitry that regulates the current or voltage and an integrated PIC microcontroller mid-range core that allows customization of device’s operating parameters, protection levels, programmable offset, deadtimes, slope compensation and fault handling procedures. The MCP19114 device typically consumes 5mA of current under standby mode and 30uA when in sleep mode. It can be configured into different topologies like flyback, Ćuk, boost, or single-ended primary-inductor converter.

In this reference design, the MCP19114 is configured based on the ADM00578 evaluation board in which it demonstrates how the MCP19114 device operates in a synchronous flyback topology. The circuit is designed to operate from a single supply (nominal 8V to 14V, 24V maximum). It is configured to regulate load current and can be used to drive loads like LEDs. The MCP19114 has two internal LDO voltage regulators. One of it is a 5V regulator that provides power to all internal digital circuitry and the other one is a 4V regulator that powers the internal analog circuitry. The output of the internal 5V regulator is also extended at the VDD pin to provide input power to the IC voltage doubler TC1240A. This TC1240A provides 10V to the VDR pin, which is used to provide input power to the two low-side synchronous gate drivers at PDRV and SDRV pins. The two MOSFETs, Q1 and Q2, driven by the MCP19114 PDRV and SDRV pins respectively, control the output current or voltage from the primary side of the transformer T1 to the secondary side. Most of the operational and control system parameters of this circuit can be set by programming the integrated PIC microcontroller core of the MCP19114 device. The design includes headers (J3 and J5) for in-circuit serial programming as well as I2C communication.

The program coded by the user as well as device configuration can be burned to the MCP19114 device using microchip’s MPLAB X IDE through a PICkit 3 in-circuit debugger or programmer that can be inserted at J3. A graphical user’s interface (GUI) can be used to communicate with the MCP19114 and edit operating parameters. The GUI communicates via I2C using the PICkit serial analyzer that can be inserted at J5. The user must be extra careful when uploading settings to the device since the GUI cannot determine invalid settings that may damage the device.