company blog about Supply MPS AC-DC Product:PFC/LLC Controller,Synchronous Rectifier,Power Savers

Supply MPS AC-DC Product:PFC/LLC Controller,Synchronous Rectifier,Power Savers

The MPS PFC+LLC AC-DC solution is a mainstream two-stage high-efficiency architecture for adapters, server power supplies, industrial power supplies and energy storage charging equipment. It integrates PFC correction and LLC resonant control into a single chip, combined with a dedicated synchronous rectifier IC and a light-load energy-saving mechanism. Covering a power range of 100W to 3kW, it balances power factor, full-load efficiency, standby power consumption and system BOM optimisation, It is suitable for applications such as fast-charging adapters, PC power supplies, industrial control power supplies and energy storage modules.

I. Product Details Analysis
1. PFC/LLC Combination Controller
MPS’s PFC/LLC two-in-one controller utilises a digital control architecture as its core, incorporating a built-in high-voltage half-bridge driver, bootstrap diode, adaptive dead time and multi-mode energy-saving logic. It supports CCM/DCM/CrM multi-mode switching, with certain models offering UART digital configuration and parameter debugging via a GUI tool, thereby lowering the barrier to power supply development.
The HR1200 and HR1203 are basic digital models that support burst mode and feature ultra-low no-load power consumption, meeting the EuP Lot 6 energy efficiency standards. They incorporate two-stage overcurrent, overtemperature and latch protection, making them suitable for standard adapters and industrial power supplies. The HR1211 and HR1215 support online UART configuration and feature programmable noise suppression to address audio noise issues. They operate in CCM mode under heavy loads to minimise MOSFET peak current, whilst switching to DCM mode under light loads to reduce switching losses, making them the preferred choice for multi-port, high-power PD fast charging applications. The HR1275 is a CrM/DCM version that integrates skip-cycle mode to further optimise light-load efficiency, making it suitable for devices with stringent standby power consumption requirements; the HR1213 supports both AC and DC inputs, adapting to special input conditions such as energy storage and in-vehicle auxiliary power supply.
The devices integrate X-capacitor discharge and a high-voltage start-up source, reducing the number of external discrete components. Packages include SOIC and TSSOP, making them suitable for automated surface-mount production. They feature strong dv/dt immunity, enhancing the stability of the power supply in complex electromagnetic environments.

2. LLC Synchronous Rectifiers
Synchronous rectification is central to improving the efficiency of the LLC output stage; by replacing traditional fast-recovery diodes, it significantly reduces conduction losses. The representative model, the MP6924A, is a dual-channel synchronous rectification driver that supports both CCM and DCM modes, as well as fast-shutdown logic. It stabilises the forward voltage drop at approximately 29 mV and shuts down the MOSFET in advance when the current reverses, thereby avoiding reverse current losses and the risk of breakdown; It incorporates a built-in light-load latch-off mechanism that disables the gate drive under light-load conditions, thereby preventing light-load oscillations and abnormal losses whilst improving light-load efficiency. It is widely used in conjunction with the MPS HR series of LLC controllers in applications such as server power supplies, high-power adaptors and industrial isolated power supplies.
The synchronous rectification product range comprises single-channel and dual-channel versions, which can be selected based on the LLC transformer winding configuration. It features short-circuit protection and under-voltage lockout, exhibits high tolerance to resonant cavity frequency fluctuations, is simple to commission, and does not require complex current sampling loops.

3. Energy-saving Technology and Mechanisms
The energy-saving capabilities of this MPS AC-DC solution do not rely on a standalone external chip, but rather on a coordinated energy-saving system across the entire power chain, covering optimisation at three stages: the PFC stage, the LLC resonant stage and the synchronous rectification stage.
On the PFC side, the system automatically reduces the frequency and operating mode under light load or no-load conditions to minimise PFC switching losses; on the LLC side, it supports burst mode, cycle skipping and intermittent operation to avoid excitation losses caused by frequency spikes under light load; synchronous rectification is disabled under extremely light load conditions to eliminate static losses in the rectifier diodes. The unit’s static power consumption is reduced to the milliwatt range, meeting global energy efficiency regulations such as CoC and EuP. Certain models support programmable energy-saving thresholds, allowing customers to configure switching points via UART according to product specifications, thereby balancing efficiency, noise and output ripple. This energy-saving architecture is often referred to by customers as the MPS AC-DC energy-saving solution, helping end products easily achieve Level 6 energy efficiency and low standby certification.

II. Procurement Selection and Buyer’s Guide
1. Initial selection based on power rating and application scenario
Small-to-medium power adapters up to 100W: Prioritise the HR1200 and HR1203, which offer mature solutions requiring no UART configuration, are quick to implement, and feature a cost-effective BOM;
Multi-port PD fast charging (100W–200W): HR1211 and HR1215, which support programmable parameters and noise reduction adjustment, facilitating project iterations across multiple versions;
Industrial power supplies and energy storage chargers (200W–3kW): HR1275, featuring CrM mode with outstanding light-load efficiency, suitable for prolonged low-load standby scenarios;
AC/DC compatible input scenarios: HR1213, suitable for the secondary side of energy storage inverters and isolated in-vehicle power supplies;
Efficiency upgrade solution: When paired with the MP6924A synchronous rectification driver, overall system efficiency can be improved by 0.5%–2%, with particularly significant benefits for high-power projects.

2. Key Parameter Checklist
Confirm the input voltage range (wide-range 90–264 VAC or fixed high voltage), output power, standby power consumption specifications, and whether noise suppression is required; confirm that the transformer uses a half-bridge LLC topology; assess the EMI environment – for industrial control equipment in high-interference environments, prioritise models with high dv/dt immunity; confirm commissioning requirements: select a fixed version if no parameter modification is required; for multi-specification or customised projects, select models with UART configuration.

3. Key Points for Mitigating Procurement Risks
Prioritise selecting a complete, matched set: choose PFC/LLC controllers and synchronous rectification ICs from the same manufacturer to ensure loop compatibility and protection timing have been verified by the original manufacturer, thereby minimising commissioning pitfalls; distinguish between industrial-grade and consumer-grade versions; for industrial control equipment operating at high temperatures or on a continuous basis, verify the temperature rating; ensure packaging is in standard tape-and-reel form to avoid loose components or repackaged, refurbished items; For new projects, it is recommended to first request samples to verify loop performance, temperature rise and noise levels before placing bulk orders.

III. Mingjiada Electronics: Supply Quality and Delivery Assurance
Shenzhen Mingjiada Electronics offers a comprehensive range of electronic components and simultaneously supports the recycling of obsolete stock and end-of-line materials, establishing a dual-service model of supply and recycling to meet manufacturers’ full-cycle requirements for R&D, mass production and inventory disposal.

In terms of quality control, Mingjiada has established processes for incoming inspection, batch traceability and verification of original manufacturer documentation. All components are checked against the original manufacturer’s batch number, packaging, silkscreen markings and specification sheet information to prevent the use of refurbished, sanded-down or counterfeit components. Relying on the ISO quality management system, quality inspection records are retained to support customer re-inspections, and components are dispatched with relevant documentation to meet power supply customers’ factory audit and safety standard registration requirements. For automotive-grade and industrial power supply projects, we can provide original manufacturer’s specifications and reliability reports to assist clients with certification.

In terms of delivery capability, we maintain stock in dual warehouses in Shenzhen and Hong Kong, with mainstream models always in stock. We support sample orders, small-batch trial production and large-volume reel-and-tape orders, whilst R&D prototyping can be delivered rapidly; lead times for standard stock items are short, and for hard-to-source models, we source through global channels to provide transparent delivery estimates; we offer tiered pricing, and for long-term mass production projects, we can negotiate a stable pricing framework to mitigate the risk of component price increases. We also provide complementary technical support services, assisting customers in verifying part equivalencies and package version differences to create a one-stop component procurement solution.