E Tech launched a 20W fast charging ACDC kit using ETA8056 and ETA80035

Mondo Technology Updated on 2024-02-23

The charging head network learned from the ** chain that Yutai Semiconductor has launched a 20W fast charging AC-DC fast charging chip, which is built with Etek's quasi-resonant flyback power chip ETA8056 and Etek's synchronous rectifier chip ETA80035, and the whole solution has advantages in cost and performance.

The following is a detailed analysis of this set of solutions.

E-Tech 20W fast charging AC-DC package solution at a glance.

The length of the PCBA module measured by vernier calipers is about 392mm。

The width of the PCBA module is about 346mm。

The thickness of the PCBA module is about 187mm。

The front of the PCBA module is at a glance, with a fuse resistor on the left side, a transformer in the middle, a high-voltage filter capacitor and a color ring inductor below, a blue Y capacitor welded on the right side, an output filter capacitor and a USB-C interface board.

The upper left corner of the PCBA module is welded with a rectifier bridge, the lower part is welded with a primary main control chip, the lower corner is welded with a feedback optocoupler, and the lower right corner is welded with a synchronous rectifier chip.

The solution uses ETA8056 primary power chip and ETA80035 synchronous rectifier chip, both chips are integrated with controller and MOS tube, and the peripheral components are simplified.

E-Tech ETA8056 is an internally integrated 1The quasi-resonant flyback power chip of 2 650V high-voltage N-channel power tube supports constant power output and reduced power output, and supports frequency foldback, which can effectively reduce electromagnetic interference, improve average energy efficiency, improve EMI performance, and meet the latest six-level energy efficiency standards.

The ETA8056 is a multi-mode QR CCM controller that supports pulse mode, PFM PWM mode, constant power mode, and power reduction mode. Under full load conditions, the chip can work in both CCM mode and DCM mode at the same time. In addition, the quasi-resonant (QR) function is always in effect in DCM mode. With both optocouplers and secondary-side control circuitry, the ETA8056 achieves very low standby power consumption, efficient dynamic response, and precise voltage regulation.

The ETA8056 has adjustable line loss compensation, supports current sampling resistance short-circuit protection, and has comprehensive protection functions such as transformer winding short-circuit protection. The chip has an integrated soft-start function with very low standby power consumption and meets the average efficiency requirements of DOE 6 or COC v5.

ETA8056 has a working voltage range of 7-37V, which can be directly used for QC or PD fast charging solutions, using SOP-7 package, and combined with Eta80035 synchronous rectifier chip, it can design an efficient 20W fast charging solution design, and then we will introduce the ETA80035 synchronous rectifier chip in detail.

E-Tek ETA80035 is a synchronous rectifier chip with integrated synchronous MOS transistor of E-Tek, which belongs to the product of the ETA SR family, with a built-in 15M 60V synchronous rectifier transistor, suitable for 20W fast charging applications. It uses the extremely low turn-on voltage drop of the MOS tube to eliminate the voltage drop loss of the Schottky diode, reduce the temperature rise and improve efficiency.

ETA8003X integrates a variety of power MOS transistors, supports high- and low-side rectification, supports the system to work in multiple working modes such as current intermittent mode DCM, current continuous mode CCM, quasi-resonant valley turn-on mode QRM, critical conduction mode CRM, and supports 10-150kHz switching frequency. In addition, the ETA8003X can effectively meet the requirements of the power system for the latest DOE20 standard average efficiency requirement. In standby mode, the extremely low quiescent current ensures that the standby power consumption of the system is extremely low.

The ETA8003X's intelligent multiple activation judgment conditions effectively prevent the undesirable situation of false activation and non-activation. The 3A high-current pull-down and 25ns shutdown delay can effectively and quickly shut down the external FET, thereby reducing the peak voltage of the system at CCM. The integrated synchronous tube is available in 60V, 80V, 100V and other withstand voltage specifications, and the on-resistance is in the range of 5-20m.

The ETA8003X is PB Free, RoHS and REACH compliant, and is available in SOP8 and DFN5x6 packages, making it suitable for AC-DC adapters, USB PD fast charging adapters, variable output voltages, high output currents, and high-efficiency flyback power supplies.

The ETA8056 is a quasi-resonant flyback power chip with integrated 12 650V high-voltage N-channel power tube. The chip supports constant power output and low power output, and has a frequency foldback function, which can effectively reduce electromagnetic interference, improve average energy efficiency, meet the six-level energy efficiency standard, support multiple working modes, with adjustable line loss compensation and comprehensive protection functions, suitable for QC or PD fast charging solutions.

ETA80035 is a synchronous rectifier chip with built-in 15M 60V synchronous rectifier tube, which supports high- and low-side rectification and multiple working modes, and is suitable for 20W fast charging applications. The chip has intelligent multiple turn-on judgment conditions to prevent false turn-on and achieve low quiescent current in standby mode, which is suitable for AC-DC adapters, USB PD fast charging adapters and other fields, and complies with PB Free, RoHS and REACH standards. The ETA8003X series is available in SOP8 and DFN5x6 packages, and supports up to 65W fast charging applications.

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