Shenzhen Mingjiada Electronics Co., Ltd. supplies and recycles the MPS HR1211GY multi-mode PFC and current-mode LLC controller, featuring programmable audible noise suppression control.
I. HR1211GY Product Overview
The HR1211GY (HR1211GY-0001-Z) is a digital, all-in-one PFC+LLC resonant controller launched by MPS (CoreSource Systems), specifically designed for high-power, offline switching power supplies ranging from 65W to 300W. The chip integrates a front-end multi-mode power factor correction (PFC) circuit with a back-end current-mode LLC resonant controller. It innovatively features a programmable acoustic noise suppression control system. Leveraging its built-in digital core and UART parameter configuration interface, it delivers high efficiency and excellent power factor across the entire load range while addressing the common issue of transformer and inductor acoustic noise found in adapters, display power supplies, industrial power supplies. It is the preferred control solution for high-power PD fast charging, all-in-one power supplies, LED drivers, and industrial energy storage power supplies.
Traditional analog PFC+LLC solutions have fixed hardware parameters, making them highly prone to audible noise during light-load burst modes; In contrast, the HR1211GY employs a hybrid digital-analog architecture, allowing flexible software adjustment of the PFC stage and LLC stage operating modes, frequency ranges, and burst timing—without requiring modifications to peripheral components. This precisely avoids the 200 Hz to 2 kHz frequency band, which is sensitive to the human ear, achieving a balanced optimization of noise and efficiency.
II. Core Architecture and Operating Principles of the HR1211GY
1. PFC Stage: Hybrid CCM/DCM Multi-Mode Digital Average Current Control
The PFC employs patented digital average current control, supporting automatic switching between CCM (Continuous Conduction Mode) and DCM (Discontinuous Conduction Mode):
Heavy-load conditions (CCM): Reduces MOSFET peak current, broadens the power output range, meets stringent harmonic and power factor specifications, and easily complies with IEC 61000-3-2;
Medium-load conditions (CCM/DCM hybrid): Balances switching losses and conduction losses;
Light-load / standby conditions (DCM + configurable digital soft-burst): In conjunction with an audible noise suppression strategy, it controllably reduces the switching frequency to minimize whining caused by magnetic strain in inductors.
Built-in 4-bit programmable slope compensation effectively suppresses subharmonic oscillations and improves system loop stability.
2. LLC Stage: Current-Mode Resonant Control (Steady-State / Frequency-Hopping / Burst—Three Modes)
Unlike traditional voltage-mode LLC, the HR1211GY employs current-mode control, offering faster loop response and stronger load transient stability, and supports adaptive switching among three operating modes:
Steady-State Continuous Mode: Maintains continuous switching in the medium-to-heavy load range to ensure stable ZVS in the resonant cavity;
Skip Mode: For medium-to-light loads, intermittently skips switching cycles to reduce losses;
Digitally Frequency-Controllable Burst Mode: For extremely low loads or standby; serves as the core mechanism for programmable auditory noise suppression.
The chip integrates Adaptive Dead-Time Adjustment (ADTA) and Capacitive Mode Protection (CMP), ensuring Zero-Voltage Switching (ZVS) for the primary-side MOSFET throughout the entire operation, thereby preventing increased losses and amplified noise caused by hard switching during capacitive operation.
III. Programmable Auditory Noise Suppression Control
Power supply auditory noise primarily originates from the magnetostriction of power inductors and resonant transformers; the low-frequency pulses in light-load burst mode are highly likely to fall within the human auditory perception range. The HR1211GY implements multi-dimensional programmable noise reduction via digital registers, with the following core control methods:
1. Programmable upper and lower limits for burst mode frequency
Customize the burst start/stop frequency range to shift the burst operating frequency out of the 200 Hz–2 kHz range, which is sensitive to human hearing; configure maximum/minimum burst frequencies and burst hysteresis thresholds.
2. Digital Soft-Switching Burst Timing
Supports gradual activation/deactivation of burst pulses, eliminating current surges caused by traditional hard switching and reducing the vibration excitation source from inductors.
3. Two-Stage PFC and LLC Coordinated Noise Reduction Strategy
Synchronously configure the down-conversion points and mode-switching thresholds for both stages via UART to prevent beat noise caused by the PFC and LLC operating at low frequencies independently.
4. Flexible Configuration of Load Thresholds
Customizable frequency-hopping and burst mode entry/exit load points allow designers to fine-tune noise performance based on the characteristics of the transformer and inductor, without the need to replace magnetic components.
Comparison of Advantages: Analog controller noise reduction solutions rely solely on fixed hardware RC parameters; the HR1211GY enables software-based optimization of noise performance at any time during R&D, debugging, and mass production, significantly shortening the iteration cycle for magnetic components.
IV. Key Hardware Integration Features of the HR1211GY
Built-in High-Voltage Start-Up Current Source
Eliminates the need for traditional start-up resistors; when AC input power is lost, the high-voltage pin is repurposed as an X-capacitor discharge circuit, eliminating the need for external discharge resistors, meeting safety regulations, and streamlining the BOM.
Integrated High- and Low-Side Driver Circuits
A single chip directly drives the PFC MOSFETs and the LLC primary-side upper and lower bridge MOSFETs, simplifying PCB layout.
Ultra-Low No-Load Power Consumption
Optimized standby control logic reduces no-load power consumption to less than 100 mW, easily meeting EuP and CoC Level 6 energy efficiency standards.
UART Digital Configuration Interface
When used with MPS’s official visual GUI software, this interface allows reading and writing internal registers to configure frequency, protection thresholds, noise reduction parameters, and mode switching points; parameters can be stored in the on-chip MTP non-volatile memory for mass production.
V. HR1211GY Comprehensive Protection Mechanisms
Input Undervoltage Lockout (UVLO), Output Overvoltage Protection (OVP)
Independent PFC/LLC Overcurrent Protection (OCP), Overload Protection (OPP)
On-chip Over-Temperature Protection (OTP), Output Short-Circuit Protection (SCP)
LLC Capacitive Mode Protection, Configurable Latch/Auto-Restart on Fault
VI. Summary of Key Electrical Parameters for the HR1211GY
AC Input Voltage Range: 85 V–265 V AC
Programmable Maximum Switching Frequency: Up to 250 kHz
Package: SOIC-20 (HR1211GY)
Control Architecture: Digital Average Current PFC + Current-Mode LLC
Communication Interface: Hardware UART
VII. Typical Application Scenarios for the HR1211GY
USB PD 3.1 100W–240W multi-port fast-charging adapters (the preferred choice for GaN power solutions)
Built-in power supplies for laptops and all-in-one PCs
Power supplies for large-screen TVs and monitors
Industrial switching power supplies and energy storage battery chargers
High-power LED outdoor driver power supplies
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