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From December 20th to 31st, East Tech Semiconductor held the fourth quarter 2024 new product training meeting and technical exchange meeting in South China and East China branches successively. Agents and industry partners from South and East China gathered together to discuss technology and exchange products. In this exchange meeting, East Tech Semiconductor showed its latest achievements in the field of Gallium Nitride fast chargers and controllers, includingNewly upgraded AHB chips - DK87XX series B/P version controllers, new PFC master controller, PSR high PF GaN series DK89XX chips and new synchronization controllers.At the same time, the East Tech ae, fae team also introduced the application guidelines and precautions for the new products in detail.

During the meeting, Dongke's technical team and online and offline industry partners had positive exchanges and communication, and the participating partners showed full affirmation and expectation for Dongke's products. This not only highlights the excellent technical standard and customer service ability of Dongke ae and fae team, but also reflects the close cooperation and solid market foundation between the company and industry partners.

Dongke Q4 offline technical exchange meeting scene (left and right slide to see more)

Newly upgraded AHB chip

DK87XX Series B/P Version Controller

The DK87XX series of B/P version controllers have been iteratively optimized based on the DK87XXAD series of Dongke's initial generation of AHB fully-encapsulated chips to provide even better performance. For exampleBetter EMI performance under light load; lower SR spikes; increased resonant capacitor adaptive discharge function for safer output voltage switching; increased loop immunity and lower audible noise;Maximum 160ms, Peak LOAD instantaneous overpower function, suitable for power supplies with high overcurrent requirements, such as 1.5 times the overcurrent point.

DK87xx Series Selection Table

New PFC master control

DK36XX Series

The DK36XX series is a newly introduced critical mode power factor correction (PFC) controller chip that operates in critical conduction mode for heavy loads and seamlessly switches to intermittent conduction mode when the load is reduced. The chip has built-in soft-start, input under-voltage protection, input power compensation, over-temperature protection, output under-voltage and over-voltage protection, and over-current protection. Working in DCM/CRM operating mode.With high PF value, low THD, low standby power consumption characteristics; suitable for use with back stage FLYBACK, AHB, LLC and other chips.

Selection table for DK36xx series products (DK3602/3 sample stage)

New PSR High PF Gallium Nitride

DK89XX Series

DK89XX is an isolated low THD, high PF primary side control quasi-resonant, constant voltage output GaN driver controller. It supports constant voltage output, built-in high voltage startup circuit to realize fast startup; THD compensation line to meet high PF and low THD and get high efficiency. Based on the high PF characteristics of DK89XX, it can be used with the rear DC-DC line, which can significantly reduce the BOM cost in the fast charging program.

DK89xx Series Product Selection Chart (Sample Stage)

New Synchronous Rectifier Controller

DK3704A Chip

The DK3704A is a new synchronous rectifier controller chip with external power tubes that can replace the Schottky diode to realize the rectification function, which greatly improves the efficiency of the system, and can be applied to QR flyback, active clamped flyback ACF, asymmetric half-bridge AHB, etc. The DK3704A has several features that can improve the efficiency: a fast comparator with a shorter transmission delay to reduce switching losses, a higher gate drive voltage to reduce MOSFET conduction losses, and a built-in standby mode to further reduce the standby power consumption. The DK3704A has several features to improve efficiency: a fast comparator with a short transfer delay reduces switching losses, a higher gate drive voltage reduces MOSFET conduction losses, and a built-in standby mode further reduces standby power consumption. Utilizing the output voltage to power the chip reduces power supply losses.

DK3704A

Typical Application Diagram

The DK3704A has a built-in adaptive slope anti-false turn-on algorithm, which further simplifies the design by eliminating the need for external parameterization, and distinguishes between normal turn-on cycles and resonance, ensuring that no false turn-on occurs when the system is operating in intermittent mode.