Introduction

Recently, ChargerLAB got a 370W GaN desktop charger from RICOMM. It has four USB-C ports and three of them support 140W PD3.1 fast charging, and the USB-C4 port supports 65W fast charging. It can distribute power at 140W+100W+65W+65W, with a total output power of 370W. Next, let's take it apart to see its internal components and structure.

Product Appearance

Teardown of RICOMM 370W GaN Desktop Charger (RCD3701)-Chargerlab

RICOMM, appearance, and selling points are printed on the front of the box.

The selling points, specifications, certification, and other information are printed on the bottom.

The box contains the charger, power cord, and some documents.

The two ends of the power cord use US-standard two-pin plugs and T-shaped plugs, respectively, and the cord body is designed to be flat. A shielding magnetic ring is provided on the cable.

The length of the power cord is about 152.5 cm (60.039 inches).

The RICOMM 370W GaN desktop charger uses a fire-retardant PC shell, with the side and bottom shell sprayed with silver-gray metallic paint, and the top panel is black.

The black panel is printed with the words 370W GaN.

RICOMM is printed on the lower left edge.

There is an indicator light on the other side, which lights up green when powered on.

It has four USB-C ports.

The specs info is printed on the bottom.

Model is RCD3701. It can support input of 100-240V~50/60Hz 5.0A. The USB-C1, C2, C3 can support output of 5V3A, 9V3A, 12V3A, 15V3A, 20V5A, and 28V5A, the maximum output power is 140W. The USB-C4 can support output of 5V3A, 9V3A, 12V3A, 15V3A, and 20V3.25A. It can distribute power at 140W+100W+65W+65W, with a total output power of 370W. It has passed CE, FCC, UKCA, and ETL certifications.

There are anti-skid pads at the four corners of the bottom to enhance stability.

There is a power cord slot at the bottom.

This design ensures that the power cord is connected stably and does not fall off during long-term use.

The length of the RICOMM 370W GaN desktop charger is about 153.3 mm (6.035 inches).

The width is about 88.5 mm (3.48 inches).

The thickness is about 46.6 mm (1.83 inches).

That's how big it is in the hand.

The weight is about 1112 g (39.22 oz).

ChargerLAB POWER-Z KM003C shows the USB-C1 port can support QC3.0, QC5, PD3.1, PPS, DCP, and Apple 2.4A charging protocols.

And it has six fixed PDOs of 5V3A, 9V3A, 12V3A, 15V3A, 20V5A, 28V5A, and a set of PPS, which is 3.3-21V5A.

The supported protocols of USB-C2 are the same as the USB-C1.

So are the PDOs.

The supported protocols of USB-C3 are the same as the USB-C1.

So are the PDOs.

ChargerLAB POWER-Z KM003C shows the USB-C4 port can support QC3.0, QC5, PD3.0, PPS, DCP, and Apple 2.4A charging protocols.

And it has five fixed PDOs of 5V3A, 9V3A, 12V3A, 15V3A, 20V3.25A, and a set of PPS, which is 3.3-21V3A.

Teardown

Remove the hidden screws inside the four anti-slip pads to open the case.

The PCBA module is fixed with screws, covered with a large thermal pad, and the area of the chips is hollowed out.

Since the PCBA module is fixed to the shell by glue, the module can only be removed by cutting the shell.

The length of the PCBA module is about 146.5 mm (5.77 inches).

The width is about 83.3 mm (3.28 inches).

The thickness is about 37.8 mm (1.49 inches).

The front of the PCBA module is filled with pink potting compound, and the top is covered with a graphite thermal pad.

Clean up the potting compound.

ChargerLAB found it adopts two PFC and four independent switching power supplies.

Multiple switching power supplies all use PI's highly integrated power supply solution, and the circuit design is simple and clear.

This side of the PCBA module has a time-delay fuse, a safety X2 capacitor, filter inductors, common mode chokes, bridge rectifiers, filter capacitors, and other components.

The two bridge rectifiers are equipped with heat sinks. The transformer is equipped with a thermistor.

The time-delay fuse is from Chevron. 10A 250V.

The safety X2 capacitor is from DGCX. 0.82μF.

The common mode choke is insulated by heat-shrinkable tubing.

The other two common mode chokes can better filter out EMI interference.

The NTC thermistor is used to suppress the power-on surge current.

This is another thermistor.

The bridge rectifier is from WORLD and adopts GBU package. The operating temperature is -55~+175℃. 15A 1000V. Model is WRGBU1510.

Here is the information about WORLD WRGBU1510.

The other bridge rectifier is also from WORLD. Model is GBU1510.

The filter capacitors are from DGCX. They are 205J450V and 155J450V respectively.

The filter inductor is insulated by heat-shrinkable tubing.

These two PFC boost controllers are from PI and adopt InSOP-T28F package. It integrates 750V PowiGaN MOSFET, with good heat dissipation performance and high integration. It can provide a high power factor and high efficiency under wide load conditions. Model is PFS5278F.

This is the PFC boost inductor.

This is another PFC boost inductor.

These two PFC boost rectifiers are from PY. Model is MUR1060GS.

These five electrolytic capacitors are from YMIN. 420V 82μF.

The four capacitors that power the master control chip are from Acon. 63V 10μF.

The master control chip of the USB-C1 is from PI. It belongs to PI's new generation flyback IC InnoSwitch5-Pro series. It uses a digitally controllable offline constant voltage/constant current flyback switcher IC controlled by SR FET with zero voltage switching (ZVS), features include 750V or 900V PowiGaN, synchronous rectification and Fluxlink feedback, and an output voltage up to 30V. Model is INN5377F.

The master control chip of USB-C2 is the same as that of USB-C1.

The master control chip of USB-C3 is also the same as that of USB-C1.

These are three transformers that correspond to three USB-C ports.

The SMD Y capacitor is from TRX. Its small size and light weight are suitable for high-density power products such as GaN fast chargers.

There is the second SMD Y capacitor from TRX.

This is the third SMD Y capacitor from TRX.

The three synchronous rectifiers of three independent circuits are all from Wayon and adopt PDFN5060-8L package. 120V 7mΩ. Model is WMB072N12LG2.

This is the second set of synchronous rectifiers.

This is the third set of synchronous rectifiers.

The solid capacitors for output filtering are all from YMIN. There are two per circuit. 35V 680μF.

These three capacitors are from YMIN. 160V 1μF.

The other end of the PCBA module is equipped with the transformer, solid capacitor for output filtering, and other components of the USB-C4 circuit.

The master control chip of the USB-C4 port is from PI. It also belongs to the InnoSwitch5-Pro series. Model is INN5376F.

Here is the transformer.

These two blue Y capacitors are from DGCX.

The synchronous rectifier is from Wayon. Model is WMB072N12LG2.

The solid capacitor for output filtering is from PolyCap. 25V 1000μF.

Here is the LED indicator light.

Here is the thermistor.

There is a small PCB at the output end, with protocol chips, output VBUS MOSFETs, and four USB-C connectors on the front.

Remove the small PCB, and there are no components on the back.

The protocol chip of USB-C1 and USB-C2 ports adopts INJOINIC. It supports multiple USB ports, dual-port 18-140W fast charging, independent feedback control, and independent USB PD control, which is equivalent to integrating two IP2736 into one chip. It supports PD3.1, UFCS, PD3.0, PPS, and other protocols, and the compatibility is very good. Model is IP2738U.

Injoinic IP2738U has four independent NMOS drivers built in, which can be used for multiple ports output control, multiple VBUS MOSFETs for output port switching, and two power supply parallel controls. It also supports dual-way independent over-current, over-voltage, and short-circuit protection to ensure safe use.

Here is the information about Injoinic IP2738U.

The output VBUS MOSFET of the USB-C1 port is from Wayon, and it is marked with 028N04L4.

The output VBUS MOSFET of the USB-C2 port is the same as that of the USB-C1.

The protocol chip of USB-C3 and USB-C4 ports is also from INJOINIC. Model is IP2738U.

The output VBUS MOSFET of the USB-C3 port is from Wayon, and it is marked with 028N04L4.

The output VBUS MOSFET of the USB-C4 port is from Wayon, and it is marked with 028N04L4.

Here are the USB-C1/2/3 sockets.

Here is the USB-C4 socket.

Well, those are all components of this desktop charger.

Summary of ChargerLAB

Here is the component list of the RICOMM 370W GaN desktop charger for your convenience.

The power cord is detachable and about 1.5 meters long. The unique T-shaped connector of the power cord makes it difficult to fall off after connecting to the charger. It has four USB-C ports and three of them support 140W PD3.1 fast charging, and the USB-C4 port supports 65W fast charging. It can distribute power at 140W+100W+65W+65W, with a total output power of 370W.

After taking it apart, we found it adopts the solution of two PFC + four QR flyback switching power supplies to distribute the power output of four ports. Thanks to the high integration of components, the design of so many circuits is also quite simple, which improves the reliability of the system.

The front of the PCBA module is filled with pink potting compound, and the top is covered with a graphite thermal pad. The PCBA module is filled with pink potting compound and covered with a graphite heat dissipation pad and a large thermal pad to deal with heating issues. The overall materials and workmanship are reliable.

Teardown of RICOMM 370W GaN Desktop Charger (RCD3701)

Introduction

Product Appearance

Teardown

Summary of ChargerLAB