Synchronous Buck DC-DC Converter Reference Design

The reference design for a BUCK converter options analogue-digital fusion management expertise for environment friendly energy provide administration.

The management of switching energy provide circuits utilizing digital controllers similar to DSP (Digital Sign Processor) has been in sensible use for over twenty years. Nevertheless, it has remained confined primarily to fields requiring “switching energy provides with massive energy and excessive performance” and “DC/DC converters needing high-speed response.” In distinction, most commercially out there switching energy provides within the 300W vary (small to medium energy) are nonetheless managed by analogue controllers. This desire is as a result of high-speed, high-performance processors like DSPs devour a whole lot of energy and are costly, resulting in inefficiency and elevated prices in low-power purposes. To handle these points, ROHM proposes utilizing analogue-digital hybrid management (LogiCoA Controls) in switching energy provide designs, which mixes the strengths of analogue and digital management whereas mitigating their respective disadvantages.

LogiCoA001-EVK-001 is a reference design for a BUCK converter that leverages ROHM’s LogiCoA analogue-digital fusion management expertise. The design contains the ML62Q2035 microcontroller, optimized for LogiCoA, a 100V gate driver, LDOs, an operational amplifier, and a shunt resistor. The reference design comes with complete design knowledge, pattern software program, an working system for energy provide management, and a reference board. We invite you to discover the capabilities of the LogiCoA analogue-digital fusion management expertise and think about its software in your future energy provide system improvement tasks.

The MCU ML62Q2035 is mounted as an influence provide controller on this design. The MCU’s VDD voltage is provided from the management block energy provide Vcc5V. As soon as the provided voltage exceeds the 4.10V threshold voltage of the Energy-On Reset (POR), the microcontroller initiates its startup sequence, and the RMOS begins its operation.

The design contains a pulse-by-pulse Over Present Safety (OCP) perform. The drain present of the low-side FET is monitored by an analogue comparator within the drain present detection block. When the present exceeds the 6.0A detection threshold, the safety mechanism prompts, turning off the FET. After detection, the DC-DC converter mechanically restarts from safety mode. Nevertheless, the OCP can be detected once more if the overload situation persists.

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The LogiCoA MCU options operational timers with 10 outputs, can management as much as 10 energy units, and is optimized for producing gate drive indicators. It contains three analogue comparator channels for PWM sign technology, overcurrent safety circuits, and two D/A converter channels that can be utilized as reference voltage indicators. The operational timer is designed for versatile configurations, permitting settings for “inter-timer coordination operation,” “timer-comparator coordination operation,” “timer-external inter-signal coordination operation,” and “part monitoring operation.” This flexibility permits the management of varied energy provide circuit topologies, together with Buck, Enhance, Buck-Enhance, ahead, bridges, PWM flyback, quasi-resonant flyback, boundary present mode PFC, and interleaved PFC.

ROHM has examined this reference design. It comes with a invoice of supplies (BOM), schematics, meeting drawing, printed circuit board (PCB) format, and extra. The corporate’s web site has extra knowledge concerning the reference design. To learn extra about this reference design, click on right here.