Introduction
This teardown features the MORNSUN LMS550-P12BCPRS server power supply. It supports 100–240V AC input as well as 240V HVDC input. The main output voltage is 12.2V with a rated output current of 45A, while the standby output provides 12V at 3A, delivering a total rated output power of 550W.
The power supply meets 80 PLUS Platinum efficiency and includes PMBus/I²C communication capabilities, allowing real-time monitoring of voltage and current. The teardown examines the internal components and design of the MORNSUN server power supply.
Product Appearance
The enclosure is made of galvanized steel, with a label affixed to the front.
Model: LMS550-P12B
AC Input: 100–240V~ 7–3.5A 50/60Hz
DC Input: 240V ⎓ 3.5A
DC Output: +12.2V 45A, +12VSB 3A
Rated Output Power: 550W
Close-up of the grounding spring clips.
The rear side features screws and grounding spring clips.
The input side is equipped with a carrying handle, cooling fan, input socket, power indicator, and trip handle.
Close-up of the power connector.
Close-up of the mounting handle.
Close-up of the LED indicator.
Close-up of the trip handle.
The output side is equipped with a grille and a gold finger connector.
The length of the module is about 199.4 mm (7.85 inches).
The width is about 73.7 mm (2.9 inches).
The thickness is about 38.9 mm (1.53 inches).
That's how big it is in the hand.
The weight is about 724 g (25.54 oz).
Teardown
Next, let's take it apart to see its internal components and structure.
Unscrew the screws and open the enclosure.
The PCBA module is insulated with a Mylar sheet.
The PCBA module is secured inside the enclosure with screws.
The indicator light is connected via a connector and reinforced with adhesive.
The cooling fan is connected via a connector and reinforced with adhesive.
Close-up of screws securing the PCBA module
Remove the PCBA module.
The input wire is connected via soldering.
Thermal pads are applied inside the enclosure at the positions corresponding to the LLC MOSFETs and synchronous rectifiers.
The front side of the PCBA module contains components such as a fuse, varistor, safety X2 capacitors, bridge rectifiers, NTC thermistor, relay, PFC MOSFET, PFC rectifier, and LLC MOSFETs.
The back side of the PCBA module contains components such as SMD Y capacitors, PFC controller, LLC controller, synchronous rectifier controller, synchronous rectifiers, and output control MOSFETs.
Remove the control PCB, heatsink, and the high-voltage filter capacitor.
The input fuse is insulated with a heat-shrink tube, rated at 10 A, 250 V.
Two blue Y capacitors, part number HJ222M.
The varistor, part number 10D561K-2, is used to absorb overvoltage surges.
The safety X2 capacitor is rated at 1 μF.
The common mode choke is wound with enameled wire and features insulating phenolic boards on the interior and bottom.
Close-up of the surface-mount gas discharge tube.
The safety X2 capacitor is rated at 0.22 μF.
The SMD Y capacitors are from TRX, part number TMY1222M. Their compact size and light weight make them well-suited for high-density power products such as GaN fast chargers.
The bridge rectifiers are from YJ, model KBJ1010, rated at 1000 V, 10 A, and use the KBJ package.
The relay is from HONGFA, model HF32FV-G/12HSTF. It is an ultra-compact medium-power relay with a single normally open contact, a contact switching capacity of 10 A, and a coil voltage of 12 V.
The NTC thermistor is marked MF7130D-13.
The film filter capacitor is rated at 0.68 μF, 450 V.
The PFC controller is from Texas Instruments, model TMS320F2800137. It features a 120 MHz C2000 32-bit MCU with integrated FPU and TMU, 256 KB Flash, and 36 KB RAM. It includes I²C, CAN, and SPI ports, an SCI interface, built-in ADC and DAC, and enhanced control peripherals. The device comes in a VQFN48 package.
The voltage regulator is from JSCJ, model CJT1117B-3.3. It supports a 20 V input voltage, provides a 3.3 V output voltage, delivers up to 1 A output current, and comes in a SOT-223 package.
The operational amplifier is from SGMICRO, marked SZ9, model SGM8965-1. It is a high-performance CMOS op-amp with rail-to-rail input and output, optimized for low-voltage single-supply applications, and comes in a SOT-23-5 package.
The driver marked CLFTj is used for PFC MOSFET driving and comes in a SOT-23-5 package.
The LLC MOSFETs and PFC MOSFETs are mounted on the heatsink.
The PFC MOSFET is from Silan, model SVS20N60P7D2. It is an N-channel MOSFET with a voltage rating of 600 V, an on-resistance of 160 mΩ, and comes in a TO-247-3L package.
A 10 mΩ sense resistor is used to monitor the current of the PFC MOSFET.
The PFC boost inductor is wound with enameled wire and features a phenolic board for insulation at the bottom.
The PFC MOSFET is from Global Power Technology, model G3S06504C. It is a SiC Schottky diode rated at 650 V, 4 A, and comes in a TO-252 package.
The bypass diode is model GS3M and comes in an SMC package.
The high-voltage filter capacitor is from AiSHi, part of the LM series of 105 °C high-temperature electrolytic capacitors, rated at 450 V, 330 μF.
The LLC controller has a scratched-off model number and comes in an SOP16 package.
The LLC MOSFETs are from Oriental, model OSG65R200FEF. They are N-channel MOSFETs with a voltage rating of 700 V, an on-resistance of 200 mΩ, and come in a TO-220F package.
The resonant capacitor is rated at 0.1 μF, 630 V.
The transformer is wound with Litz wire.
The bottom of the transformer is supported with a spacer block.
The synchronous rectifier controller is from NXP, model TEA2095. It is a dual-channel synchronous rectifier controller with two built-in drivers, capable of driving two synchronous rectifiers simultaneously and supporting independent operation. It is designed for use in LLC resonant power supplies and comes in an SO8 package.
The synchronous rectifiers are from Silan, model SVG042R5NL5. They are N-channel MOSFETs with a voltage rating of 40 V, an on-resistance of 2.5 mΩ, and come in a PDFN 5×6 package.
The two synchronous rectifiers on the other side are of the same model.
The output filter capacitors are rated at 470 μF, 16 V.
Two 0.5 mΩ sense resistors are connected in parallel for output current monitoring.
The current sensing chip is from SGMICRO, marked M93, model SGM8199A2. It supports both high-side and low-side applications, enables bidirectional current sensing, operates with a 28 V supply voltage, and comes in an SC70-6 package.
The output control MOSFETs are from Silan, model SVG032R4NL5. They are N-channel MOSFETs with a voltage rating of 30 V, an on-resistance of 2.4 mΩ, and come in a PDFN 5×6 package.
The standby power supply IC is from Silan, model SDH4875Q, and comes in an SOP8 package.
The capacitor supplying power to the main controller chip is sourced from BERYL, with a specification of 35V 100 μF.
The standby power MOSFET is sourced from NCE, model NCE70T540F. It is an NMOS with a voltage rating of 700 V and an on-resistance of 540 mΩ, packaged in TO-220F.
The standby power transformer is tightly insulated with tape wrapping.
The OR OR1008 optocouplers are used for output voltage feedback.
The rectifier is sourced from PY, model PS15150LT. It is a Schottky diode with a rating of 150 V, 15 A, and comes in a PS-277B package.
These two filtering capacitors are rated at 470 μF, 16 V.
The other diode is model PS1550L, a Schottky diode rated at 50 V, 15 A, and packaged in PS-277B.
The 5 mΩ current-sensing resistor is used for output current detection.
The current-sensing chip is an SGMICRO SGM8199A2.
The power control MOSFET is sourced from NCE, model NCE3035G. It is an NMOS with a voltage rating of 30 V and an on-resistance of 5.9 mΩ, packaged in DFN5×6EP.
The other MOSFET has the same model.
Close-up of the connector powering the cooling fan.
The operational amplifier is sourced from SGMICRO, marked with GID, model SGM8273-1. It is a low-noise, high-precision, high-voltage op-amp with rail-to-rail input and output, packaged in SOT-23-5.
The inner side of the control PCB is equipped with an MCU, a crystal oscillator, optocouplers, and isolation communication chips.
The other side is populated with buck chips and operational amplifiers.
The MCU is sourced from GigaDevice, model GD32F330RBT6. It features an ARM Cortex-M4 32-bit core with a maximum frequency of 84 MHz, integrates 128 KB of Flash and 16 KB of SRAM, supports USART, I²C, and SPI interfaces, and comes in an LQFP64 package.
Close-up of the 12.0 MHz clock crystal.
The buck converter chip, marked with 320PG, is packaged in SOT-23.
Close-up of the 10 μH buck inductor.
The operational amplifier is sourced from SGMICRO, model LM2902. It is a quad op-amp with rail-to-rail output, supports a 32 V supply voltage, and features low power consumption, low offset voltage, and low bias current, packaged in SOIC-14.
The other operational amplifier is model SGM8273-2, packaged in SOIC-8.
The digital isolation chip is sourced from 3PEAK, model TPT7741F. It is a 4-channel enhanced high-performance digital isolator, featuring three forward channels and one reverse channel, packaged in WSOP16.
The OR OR1008 optocouplers are used for isolated communication.
Close-up of the socket connected to the indicator light.
The buck converter chip is from Texas Instruments, marked with 14260P, and packaged in HSOIC-8.
Close-up of the 10 μH buck inductor.
The cooling fan is model HA4028H12SB-Z, rated at 12 V, 0.95 A, and features static blades.
Well, those are all components of the MORNSUN 550W Platinum SiC Server Power Supply.
Summary of ChargerLAB
Here is the component list of the MORNSUN 550W Platinum SiC Server Power Supply for your convenience.
The power supply is model LMS550-P12B, supporting 100–240 V AC input and 240 V HVDC input, with a rated output power of 550 W. The main output provides 12.2 V at 45 A, while the standby power output delivers 12 V at 3 A. It features a built-in cooling fan that draws air from the output side and exhausts it through the input side.
After taking it apart, we found that the PFC controller uses a TMS320F2800137, the PFC MOSFET is a Silan SVS20N60P7D2, and the PFC rectifier is a Global Power Technology G3S06504C. The LLC MOSFETs are Oriental OSG65R200FEF.
The synchronous rectifier controller uses an NXP TEA2095, paired with a Silan SVG042R5NL5. The MCU is a GigaDevice GD32F330RBT6, with isolation provided by a 3PEAK TPT7741F. The standby power supply is controlled by a Silan SDH4875Q main chip and uses an NCE NCE70T540F MOSFET. The components are solid, and the workmanship is reliable.
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