Inventory Of Mainstream AHB Controllers For Fast Charging Chargers.

In modern electronic systems, the choice of power management topology becomes a critical design factor due to the diverse power performance requirements of various electronic devices. To meet the requirements of wide input voltage, dynamic output regulation, and high efficiency, the asymmetric half-bridge architecture offers a simpler control scheme, excellent efficiency, and high adjustability, and is gradually being adopted in consumer electronics, power tools, and other fields.

In recent years, major chip manufacturers have also launched more integrated AHB controller products, ranging from highly integrated solutions with integrated GaN power devices to designs with built-in PFC control modules. The APPHONE Reference Charger Network has compiled AHB controller chips from major brands and related case studies to help engineers quickly understand and evaluate the performance of various AHB controllers in real-world applications.

Brand	Model	AC-DC Integrated	Internal PFC Controller	Package	Application Type
DK Dongke	DK3715AD	Yes	No	DFN8*8	Fast Charger
	DK3718AD	Yes	No	DFN8*8	Fast Charger
	DK8715AD	Yes	No	DFN8*8	Fast Charger
Infineon	XDPS2201	No	No	DSO-14	Fast Charger
	XDPS2221	No	Yes	DSO-14	TV Power Supply
	XDPS2BF11	No	No	DSO-14	Fast Charger
JoulWatt	JW1556	No	No	QFN 4×4-20	Fast Charger
	JW1556B	No	No	QFN 4×4-20	Fast Charger
	JW1556C	Yes	No	QFN 4×4-20	Fast Charger
Richtek	RT7795	No	No	WQFN-24L	Fast Charger

Let’s take a closer look at the aforementioned AHB controller chips, which have been used in a variety of end products. This will provide valuable information for engineers to consider when selecting and evaluating solutions.

DK Dongke.

DK3715AD

The Dongke DK3715AD is an AC-DC power switch IC based on an asymmetric half-bridge architecture, integrating two GaN power devices. It achieves zero-voltage switching (ZVS) for the primary-side power transistors and zero-current switching (ZCS) for the secondary-side rectifier transistors over a wide load range, thereby improving power system efficiency. Soft switching also reduces stress on the power transistors, and a built-in full-range frequency jittering circuit reduces switching losses and improves electromagnetic interference.
The DK3715AD features an asymmetric half-bridge (AHB) control circuit and a 600V half-bridge driver circuit, and incorporates two 700V voltage-resistant enhancement-mode GaN power ICs. It is the industry’s only fully integrated, all-in-one GaN asymmetric half-bridge IC.

DK3718AD

Dongke Semiconductor’s DK3718AD is an AC-DC power switch IC based on an asymmetric half-bridge architecture, integrating two GaN power devices. It achieves zero-voltage switching (ZVS) on the primary-side power transistor and zero-current switching (ZCS) on the secondary-side rectifier over a wide load range, thereby improving power system efficiency. Soft switching also reduces stress on the power transistors, and a built-in full-range frequency jittering circuit reduces switching losses and improves electromagnetic interference.

The DK3718AD integrates an asymmetric half-bridge (AHB) control circuit and a 600V half-bridge driver circuit, and incorporates two 700V-resistant enhancement-mode GaN power ICs. It is the industry’s only fully integrated all-in-one GaN asymmetric half-bridge IC.
The DK3718AD series features a streamlined design and debugging, significantly simplifying solution design and debugging, especially for products requiring high conversion efficiency and power density. The DK3718AD series utilizes adaptive shutdown technology for the high-side transistor and adaptive dead-zone technology for the low-side transistor, effectively preventing potential hazards associated with common half-bridge transistors. The DK3718AD series adapts to four load modes, effectively improving overall efficiency across all load ranges.
The DK3718AD series offers comprehensive protection features, including overload protection, output overvoltage protection, output short-circuit protection, VCC over/undervoltage protection, VS pin abnormality protection, primary overcurrent protection, and overtemperature protection.

DK8715AD

The DK8715AD is an AC-DC power switch IC based on an asymmetric half-bridge architecture, integrating two gallium nitride power devices. It achieves zero-voltage switching (ZVS) of the primary-side power transistors and zero-current switching (ZCS) of the secondary-side rectifier transistors over a wide load range, thereby improving power system efficiency. Soft switching also reduces stress on the power transistors, minimizing switching losses and improving electromagnetic interference.

The DK8715AD supports a maximum switching frequency of 800kHz, boasts less than 50mW of standby power consumption, features adaptive dead time, and is extremely compact. It is halogen-free, compliant with ROHS requirements, and includes built-in high-voltage startup and X-capacitor discharge circuits, providing enhanced system performance and reliability.

The DK8715AD’s streamlined design significantly simplifies the design and manufacture of AC-DC converters, particularly for products requiring high conversion efficiency and power density. The DK8715AD offers comprehensive protection features, including overload protection, output overvoltage protection, output short-circuit protection, VCC over/undervoltage protection, VS pin abnormality protection, primary overcurrent protection, and overtemperature protection.

The DK8715AD, packaged in a DFN8*8 package, is suitable for high-power-density fast chargers, adapters, laptop adapters, tablet adapters, TV power supplies, two-wheeled electric vehicle chargers, telecommunication power supplies, and LED power supplies.

Infineon.

Infineon XDPS2201

The Infineon XDPSS2201 is a digital hybrid flyback controller with an integrated 600V high-voltage startup circuit and high- and low-side MOS drivers. The XDPSS2201 can be used with the company’s IGI60F1414A1L half-bridge GaN chip, providing customers with a highly integrated, efficient, high-performance, and low-temperature GaN fast-charging solution.

The XDPSS2201 utilizes peak current mode control for fast load response. It automatically switches to burst mode based on output current levels, supports primary-side overvoltage protection, and maintains standby power consumption below 75mW. Parameters are configurable via a single-pin UART interface. Housed in a PG-DSO-14 package, it minimizes external components.

Infineon XDPS2221

Infineon’s next-generation adaptive PFC + soft-switching HFB two-in-one controller, the XDPS2221, combines a PFC controller with the powerful HFB features of the XDPS2201 controller, helping power supply manufacturers create simpler, more efficient, and compact power supply designs.

The Infineon XDPS2221 supports PD 3.1’s wide input voltage range of 90-264Vac (47Hz/64Hz), expanding its application range. It offers a 5V-28V 5A output with an output power of 140W. Its conversion efficiency exceeds 95% at 230V and 93.5% at 115V, meeting energy efficiency requirements and facilitating the development of green PD power adapters.

The XDPS2221 controller chip in this hybrid flyback-based 140W USB-PD 3.1 demo board integrates the PFC and HFB controllers. The primary-side power devices utilize three IGLD60R190D1 (190M ohm/8x8GaN) CoolGaN devices: one for the PFC GaN switch and two for the HFB GaN switches. The secondary-side utilizes the ICQ800NLS (100V/3.3mR) SR GaN switch and the CYPD3175 USB-PD power supply IC. This results in a PCB design footprint of just 109.5×28.5x24mm³, achieving a power density of 22.67W/in³ or 38W/cc. This design significantly improves performance while saving board space, making it suitable for a variety of low-power PD adapter applications.

Infineon XDPS2BF11

The Infineon XDPS2BF11 is a custom-designed model with an integrated PFC controller and HFB controller in a DSO-14 package.

JoulWatt.

JW1556

The JW1556 is an asymmetric half-bridge flyback controller in a QFN 4×4-20 package suitable for offline flyback converter applications. It features an input voltage range of 2.5-38V and a maximum operating frequency of 1.5MHz, supporting 65-300W fast charging. Its wide voltage range and high wattage support make it ideal for a variety of high-power chargers.

The JW1556 can set the operating frequency via a single external resistor, resulting in a compact design. The chip features a built-in soft-start function and supports multiple protections, including VIN OVP, VS OVP, SCP, Brown-In/Out, OTP, and CS open and short circuit protection, enhancing power system reliability. JoulWatt also provides charger manufacturers with a one-stop solution for PD 3.1 applications.

The JW1556 operates in ZVS mode under heavy loads and supports Adaptive ZVS switching for optimized efficiency. When operating in DCM mode under light load, it can provide two-way output control of the main power switch and the auxiliary switch, supporting high-voltage startup, X-capacitor discharge, burst mode control, adjustable line compensation and other functions to support various charger usage scenarios and maximize efficiency.

JW1556B

The JW1556B is a JW1556B optimized for peak loads, targeting the PC and notebook market, which requires 1-2 times the peak power.
The JW1556B shares many key features with the JW1556, including a QFN 4×4-20 package and a maximum operating frequency of 1.5MHz. It also supports high-voltage startup, X-capacitor discharge, burst mode control, and adjustable line compensation.

JW1556C.

The JW1556C is an asymmetric half-bridge flyback controller launched by JW. Designed for offline flyback converter applications, it operates in boundary mode under heavy loads and switches to DCM + quasi-resonant mode under light loads. It also supports Burst Mode control to optimize energy efficiency. Integrated soft-start and X-capacitor discharge functions reduce standby power consumption. The built-in boost converter covers a wide input range of 0-38V, and a single resistor allows for configurable switching frequency up to 1.5MHz. It features line compensation and comprehensive protection against VCC overvoltage, short-circuit, and overtemperature. Housed in a QFN 4×4-20 package, it is suitable for applications such as fast charging adapters.

Richtek.

Richtek RT7795

The RT7795 is a controller IC designed for asymmetric half-bridge (AHB) converters. It features a built-in 625V high-voltage startup device, an output power rating of up to 300W, and supports output voltages from 5V to 48V. It features a built-in X-capacitor discharge and utilizes continuous resonant operation to effectively reduce power losses in the AHB and secondary-side synchronous rectifiers.

In addition, the RT7795 utilizes a proprietary dithering method to effectively address potential audible noise, dispersing the noise’s energy and frequency. The RT7795 incorporates multiple protection mechanisms and is housed in a WQFN-24L package, making it suitable for high-power GaN fast-charging power supply designs.

Asymmetric half-bridge (AHB) controller chips currently on the market are primarily used in high-power fast-charging charger solutions, particularly GaN desktop chargers and portable multi-port chargers that exceed 100W and pursue extremely high power density.

Major manufacturers are actively launching their own AHB controller products, which not only demonstrate continuous technological innovation but also demonstrate strong competitiveness in practical applications. We see diverse application prospects for AHB controllers in single-port and multi-port applications, PD3.1 fast charging, and other fields. These products not only improve power system efficiency and reliability but also enable simplified and miniaturized power supply designs, meeting market demand for efficient and compact power solutions. As the technology matures and the market continues to expand, the AHB architecture is expected to demonstrate its unique value in more areas, driving the fast-charging industry to new heights.