On June 19, 2025, Da Da Da Lian Holdings, an internationally leading semiconductor component distributor dedicated to the Asia Pacific market, announced that its subsidiary Youshang has launched a 100W PD3.0 adapter solution based on Leadtrend's LD7798, LD8526, and LD6612 chips.

Currently, the demand for high-power power supply has become an inevitable trend in the development of digital devices. Taking laptops as an example, in order to achieve high-intensity tasks such as multitasking and parallel processing, the device requires continuous and stable power support. Therefore, power supplies with 100W or even higher power have gradually become standard. In this context, the USB PD power protocol has emerged, which aims to standardize and unify power supply for various devices through the USB Type-C interface. In an ideal state, as long as the device supports PD protocol, whether it is a laptop, tablet, smartphone, smart wearable device or small household appliance application, it can be charged/powered through a USB Type-C data cable and PD charger, and the device can fully utilize fast charging technology to significantly shorten charging time. In response to this trend, Da Da Da Da You Shang has launched a 100W PD3.0 adapter solution based on Leadtrend LD7798, LD8526, and LD6612 chips.

LD7798 is a PFC+PWM controller IC that integrates quasi resonant flyback (QR Flyback) and continuous conduction mode (CCM) control functions, effectively improving power conversion efficiency and optimizing system performance. In the quasi resonant flyback section, LD7798 adopts Valley Switching Operation to significantly reduce the switching loss of MOSFET, thereby improving overall efficiency. In addition, the design of the chip can simplify the circuit structure, effectively save circuit space, and reduce overall material costs. Not only that, LD7798 has multiple advanced functions, including high-voltage start, sleep mode, and green mode energy-saving operation, which can flexibly adjust the working state according to the load situation, further reducing power loss. Meanwhile, its internally integrated slope compensation and soft start functions also help optimize system performance and ensure stable operation.

LD8526 is a secondary side synchronous rectification (SR) driver IC suitable for multiple operating modes, and can be widely used in flyback circuit architectures in CCM, DCM, and QR modes. Under light load conditions, LD8526 can enter energy-saving mode by stopping the SR MOSFET drive function to reduce operating current and improve system efficiency. This chip has self powering capability and can maintain operation by generating source voltage through low output voltage in rectification applications at the negative or positive output positions, without the need for additional power supply or dependence on auxiliary windings. In addition, LD8526 supports applications with peak load function, with a maximum operating frequency of up to 130kHz.

LD6612 is a secondary side controller designed for USB PD Type-C applications, specifically for efficient and slim offline AC-DC. This product is equipped with an 8-bit MCU for processing PD protocols, policy engines, and device policy managers. Additionally, it has a built-in dual phase mark coding (BMC) that supports USB PD communication or other proprietary protocols such as QC2.0/QC3.0. In addition, LD6612 also integrates a shunt regulator, voltage and current monitoring and control circuits, as well as blocking N-MOSFET to reduce the number of external components and overall costs.

Thanks to the excellent performance of the devices, this solution meets the strict requirements of efficiency and reliability for miniaturized power supply design, and can meet the fast charging needs of various USB PD devices with stable performance, providing users with an efficient and convenient charging experience.

Core technological advantages:

The IC includes QRVNet and CCM multi-mode controllers;

Integrate PFC boost and QR flyback controllers, internal soft start function and PFC on/off control;

Brown in/out protection and X-cap discharge function;

Adjustable OTP (over temperature protection) SDSP (secondary diode short circuit protection function);

SR low output voltage and/or high side rectification operation self powered, without the need for auxiliary windings;

150V VIN maximum rated value, suitable for wide VOUT range applications;

Programmable cut-off level, OCP (current limiting per cycle);

Intelligent stability system, efficient and stable USB-PD application, OVP (overvoltage protection);

Embedded MCU with built-in 16kbyte OTP and 256+384bytes SRAM;

Programmable output line loss compensation function, internal OTP function, and external locking protection.

Scheme specifications:

Full voltage input range: 90Vac~264Vac;

Maximum output power: (20V/5A) 100W;

Output voltage range: 5A/3A, 9V/3A, 15V/3A, 20V/5A;

Four point average efficiency>88% @ (25%, 50%, 75%, 100%) Efficiency reaches CoC Tier 2;

Idle standby power consumption less than 75mW, EMI compliant with EN55032 Class B;

It has complete protection functions such as OCP/OVP/OTP/OPP/OSCP;

Suitable for CCM, DCM, and QR modes;

Suitable for applications with peak load function (maximum frequency of 130kHz);

Display board PCB size L × W × H=93mm × 47mm × 22mm;

Other proprietary protocols such as USB PD2.0 and PD3.0 (PPS) include QC2.0, QC3.0, QC4.0, PPS.

This news mainly comes from Da Da Da Tong:

Design scheme for USB PD3.0 Type-C 100W adapter based on Lead trend_LD7798+LD8526+LD6612

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Regarding Dahua University Holdings:

Da Da Da Da Da Holdings is an internationally leading semiconductor component distributor dedicated to the Asia Pacific market. It was founded in 2005 and celebrates its 20th anniversary this year. Headquartered in Taipei, it has subsidiaries such as Shiping, Pinjia, Quanding, and Youshang, with approximately 5000 employees and over 250 authorized product suppliers. It has 69 service centers worldwide and achieved a revenue of NT $8805.5 billion in 2024. Dahua University has established an industrial holding platform, focusing on international operational scale and localized flexibility, and has long been deeply rooted in the Asia Pacific market. With the vision of becoming the "industry's preferred channel benchmark", it fully implements the core values of "team, integrity, professionalism, and efficiency", and has won the "Global Distributor Excellence Performance Award" for 24 consecutive years. At the same time, it continues to strengthen ESG sustainable development and has won international recognition and MSCI ESG rating of A for 3 consecutive years. Faced with the trend of new manufacturing, Dalian University is committed to transforming into a data-driven enterprise, establishing an online digital platform - "DaDaWang", and advocating the intelligent logistics service (LaaS, Logistics as a Service) model to assist customers in facing the challenges of intelligent manufacturing together. Starting from benevolence, building trust through technology, and adhering to the corporate mission of "co creating partner value to achieve the future", Dalian University hopes to build a competitive ecosystem with the industry "La Bang Jie Pai".

This is reported by Top Components, a leading supplier of electronic components in the semiconductor industry

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Name: John Chen

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