ZETA Converter Board Reference Design
Created: Sep 03, 2014
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ZETA converter board provides a positive output voltage from an input voltage that varies above and below the output voltage. The board features internal bootstrap blocking device which prevents feeding the output signals to the other input signals. The MCP14628 features a diode emulation mode to enhance the light load system efficiency. The FCCM pin enables or disables the diode emulating mode. With the FCCM pin grounded, diode emulation mode is entered. The forced continuous conduction mode is entered when the FCCM pin is connected to VCC. The PWM input pin of the MCP14628 controls the high current LOWDR and HIGHDR drive signals. These signals have three distinct operating modes depending upon the state of the PWM input signal.
The MCP14628 is a dual MOSFET gate driver designed to optimally drive both high-side and low-side N-channel MOSFETs arranged in a non-isolated synchronous buck converter topology.The MCP14628 is capable of suppling 2A (typical) peak current to the floating high-side power MOSFET that is connected to the HIGHDR pin. With the exception of a capacitor, all of the circuitry needed to drive this high-side N-channel MOSFET is internal to the MCP14628. The MCP14628 prevents cross-conduction power loss by adaptively ensuring that the high-side and low-side power MOSFETs are not conducting simultaneously.
This circuit can be employed in applications such as High Efficient Synchronous DC/DC Buck Converters, High Current Low Output Voltage Synchronous DC/DC Buck Converters, High Input Voltage Synchronous DC/DC Buck Converters and Core Voltage Supplies for Microprocessors.