Industry news--Karmin Electronic (HK) Limited

Domestic power chip breakthrough: How can Xinmao Micro LLC technology achieve "one chip, multiple capabilities"?
2025-04-14

1、 Breaking through traditional architecture: from "single control" to "fully integrated Combo"

Pain points of traditional solutions: In traditional power supply solutions, PFC (power factor correction) and LLC (resonant converter) usually use independent controllers, resulting in complex peripheral circuits, high design difficulty, and limited reliability. The Xinmao Micro LP9962AA chip is the first to achieve nationwide production of PFC+LLC two in one integration technology, deeply integrating two core control modules and internally integrating 600V high-voltage gate drive, Boot diode, and X capacitor discharge functions. With minimal peripheral components, an efficient and reliable LLC resonance system can be constructed.

Technological breakthrough highlights:

Adaptive dead time control: improves system efficiency, combined with burst control mode, achieves dual optimization of light load high efficiency (standby power consumption as low as 120mW) and no-load low power consumption, meeting the future EU DOE Level 7 energy efficiency standard ahead of schedule.

Advantages of dynamic response: Adopting a simulated bidirectional current control loop, the dynamic response speed is increased by 30%, and the peak voltage fluctuation during load changes is only 426.87mV (220V dynamic test), avoiding equipment failure.

Multiple protection mechanisms: Integrated input/output undervoltage/overvoltage protection, overcurrent protection, capacitive zone protection, and over temperature protection to ensure that core components are protected from impact and extend system life.

Application scenarios:

Industrial power supply: Improve conversion efficiency and reduce long-term energy consumption costs.

PC adapter: Suitable for a wide input voltage range (90-264Vac) to meet energy efficiency sensitive requirements.

2、 Flexible Combination Ecology: Building a "Full Matrix" Product System

Modular combination strategy: Xinmao Micro forms a solution matrix covering the power range of 200W to 5000W through the free combination of current type LLC controllers (such as LP9961 series), CCM/PFC controllers (LP6655 series), and synchronous rectification controllers (LP3524B, etc.):

Typical configuration scheme:
Combo+SR "minimalist solution: for small and medium power adapters (such as 240W 20V/12A design), LP9962AA integrates PFC and LLC, paired with LP3524B synchronous rectification controller, achieving a full load efficiency of 94.5% at 220Vac and 92.19% at 110Vac.
LLC+Multi PFC Expansion Solution: Suitable for complex scenarios such as industrial power supplies and communication power supplies, it can flexibly choose between the 133kHz fixed frequency PFC chip LP6655AB or the high-frequency 200kHz model. Through external adjustable soft start, Skip threshold, and LLC startup voltage settings, it can achieve stable output under different loads.

Ecological compatibility:
Pin to Pin compatible design: For example, LP9961XX is equivalent to the international mainstream model UCC256304, reducing the cost of technology transfer.
Flexible customization: Supports programming with 128 parameters to adapt to the voltage and current requirements of different brands of devices, eliminating the need for secondary current detection circuits and improving production consistency.

3、 Performance hardcore support: dual advantages of reliability and adaptability

Technical moat:

High frequency and high density: Supports a wide operating frequency range of 35kHz~1MHz, and the LP9961 series half bridge drive circuit can operate stably at 1MHz, significantly reducing the volume of transformers and inductors, meeting the compact design requirements of LED street lights, communication power supplies, and more.
Wide temperature range: -40 ℃~150 ℃ junction temperature adaptability, ensuring stable operation in complex outdoor environments.
Cost competitiveness: Highly integrated to reduce peripheral components, reducing costs by 20% -30% compared to imported solutions. Coupled with local supply chain advantages, accelerating the introduction of domestic solutions.

Industry certification:

Energy Efficiency Standards: Meet the EU DOE Level 7 energy efficiency requirements in advance, with standby power consumption below 0.3W, in compliance with the world's most stringent energy efficiency standards.
Functional safety: Passed AEC-Q100 reliability certification, suitable for automotive grade applications.

4、 Full scene adaptation: from consumer electronics to industrial applications

Deep penetration field:

Consumer electronics: 200-650W adapter scenario, supporting primary constant current control, adaptable to various designs, improving production consistency.
Industry and Communication: In industrial power supplies above 400W, coupled with the Follower Boost function of LP6655AB, the output voltage is automatically reduced when low voltage is input, improving full load efficiency; The dual channel synchronous rectification interlock design avoids common risks of MOS transistors.
Green Energy: In the field of LED street light power supply, with low standby power consumption and wide temperature range, it helps to promote energy-saving transformation in smart cities.
Medical and server: In response to the ultra-low ripple of medical power supplies and the high reliability requirements of server power supplies, parameters can be quickly optimized through post programming functions.

5、 Cracking the problem of domestic substitution: from "usable" to "preferred"

Core competitiveness:

Technological self-reliance: Fully localized design throughout the entire chain, breaking through key modules such as high-voltage drive and adaptive control, and benchmarking performance against TI and Infineon.
Ecological openness: Provides full process technical support from chip specifications, reference designs to PCB layout guidelines, shortening product iteration cycles.
Policy and industrial chain support: As a key supported "little giant" enterprise in Luohu District, Shenzhen, Xinmao Microelectronics has enhanced its international competitiveness in the field of third-generation semiconductor power devices.

Industry Trends:

Market size: The market size of power management chips in China is expected to reach $23.5 billion by 2025, with a CAGR of 16.1%, indicating a huge potential for domestic substitution.
Technological trend: High frequency, high density, and high integration have become mainstream, and Xinmao Microelectronics' LLC technology path is highly compatible with industry development.
Conclusion: Embarking on the era of domestic LLC/PFC power supply "chips"
Xinmao Microelectronics' exploration shows that the key to solving the problem of domestic substitution lies in technological innovation guided by "user needs". Through the deep integration of
"integration+modularization+scenarization", Xinmao Micro LLC technology not only achieves performance benchmarking against international first-line brands, but also reduces customers' technology migration costs through flexible combination strategies. With the explosive demand for medium and high-power power supplies in fields such as new energy and digital infrastructure, Xinmao Microelectronics is using its "one chip multi energy" hard power to promote the transition of domestic chips from "replacement" to "first choice", injecting a stimulant into the localization of the industrial chain.

Prev：Zhixinwei launches industry-leading 2000V 25A, 75A silicon carbide Schottky diode Next：TDK launches new HVC 5481G in compact 5 × 5mm PQFN32 package