A Look Inside And Component Analysis
Before proceeding with this page, we strongly encourage you to a look at our PSUs 101 article, which provides valuable information about PSUs and their operation, allowing you to better understand the components we're about to discuss. Our main tools for disassembling PSUs are a Thermaltronics soldering and rework station, and a Hakko FR-300 desoldering gun.
|Manufacturer (OEM)||Enhance Electronics|
|Transient Filter||6x Y caps, 3x X caps, 2x CM chokes, 1x MOV, 1x CM02X|
|Inrush Protection||NTC Thermistor & Relay|
|Bridge Rectifier(s)||2x LL25XB60 (600 V, 25 A @ 113 °C)|
|APFC MOSFETs||4x Infineon IPP50R140CP (550 V, 15 A @ 100 °C, 0.14 Ω)|
|APFC Boost Diode||1x CREE C3D10060A (600 V, 10 A @ 153 °C)|
|Hold-up Cap(s)||4x Nippon Chemi-Con (420 V, 330 uF each, 1320 uF combined, 2000 h @ 105 °C, KMR)|
|Main Switchers||4x Infineon IPP50R140CP (550 V, 15 A @ 100 °C, 0.14 Ω)|
|FET Drivers||2x Silicon Labs Si8230BD|
|APFC Controller||Champion CM6502S, CM03X Green PFC|
|Switching Controller||Champion CM6901|
|MCU||STMicroelectronics STM32F302 (72 MHz, 12-bit DACs, USB interface)|
|Topology||Primary side: Full-Bridge & LLC Resonant Converter Secondary side: Synchronous Rectification & DC-DC converters|
|+12V MOSFETs||Unknown number of FETs|
|5V & 3.3V||DC-DC Converters: 4x Infineon BSC018NE2LS (25 V, 97 A @ 100 °C, 1.8 mΩ) PWM Controller: 2x APW7159|
|Filtering Capacitors||Electrolytics: Unicon (TW, 2000h @ 125 °C, UPL), Nippon Chemi-Con (105 °C, KY), Rubycon (105 °C, ZLH, YXG) Polymers: Unicon|
|Supervisor IC||SITI PS223 (OVP, UVP, OCP, SCP, OTP )|
|Fan Model||Thermaltake TT-1425 (Hong Sheng OEM, A1425L12S, 140 mm, 12 V, 0.30 A, 2250 RPM, hydro-dynamic bearing)|
|Rectifier||1x PFR10V45CT (2x 5 A, 45 V)|
|Standby PWM Controller||Sanken STR-A6062H (26.5 W max)|
|PWM Controller||1x STMicroelectronics L7912CV (TO-220, -12 V, 1.5 A)|
Again, the TPG-1500D-T's platform is provided by Enhance Electronics, and its design appears to share some similarities with Cooler's Master MasterWatt Maker 1200. This is a typical analog implementation enhanced with an MCU that handles communication with the system, allowing simultaneous monitoring of the PSU's status and control of its fan. In this price range, we frankly expected a fully digital platform where MCUs control the APFC converter, along with the primary and secondary sides. However, this isn't the case, and that's a huge let down. Compared to other digital units with similar or lower price tags, including the TPG-1250D-T, the TPG-1500D-T is in a difficult position because of its inferior platform. Enhance's semi-digital platform is probably used exclusively by Cooler Master, or it is even more expensive, preventing Thermaltake from utilizing it.
The main PCB is huge. Moreover, the primary heat sink (the only one, since the secondary side doesn't have any) is quite large and features the long fins found on all Enhance platforms. A full-bridge topology is used on the primary side, along with an LLC resonant converter. On the secondary side, a couple of DC-DC converters regulate the minor rails. The +12V rail is generated by several FETs installed close to the main transformers.
As usual, the AC receptacle hosts the first part of the EMI filter, which in this case includes two X and two Y caps. The second part of the same filter resides on the main PCB and consists of four Y caps, a single X one, two CM chokes, and an MOV. In addition, we find a CM02X on the solder side of the main PCB that blocks current through the X cap's discharge (bleeding) resistors once AC is connected, providing a small efficiency boost.
Two LL25XB60 bridge rectifiers are used, capable of handling up to 50 amps.
The APFC converter uses four Infineon IPP50R140CP FETs along with a couple of CREE C3D10060A boost diodes. We had to remove both PFC chokes in order to identify these parts. Normally we'd expect an interleaved PFC with so many components, where two PFC converters work in parallel with a phase difference among them, providing higher efficiency. However, this platform doesn't employ an interleaved PFC simply because the relevant controller doesn't support it. Finally, the bulk caps are four Chemi-Con KMRs with 330 uF capacity each, or 1320 uF combined. This capacity looks low for a 1.5 kW unit and our hold-up measurements confirm this.
An NTC thermistor protects against large inrush currents. It is supported by a bypass relay.
A small board, located between the primary heat sink and bulk caps, hosts the APFC's controller, a Champion CM6502S IC. A CM03X Green PFC controller is installed on the same board, reducing power consumption when the PSU is in standby mode.
The main switching FETs are four Infineon IPP50R140CP, which are bolted onto a small heat sink. They are arranged into a full-bridge topology and supported by a Champion CM6901 LLC resonant converter that reduces switching losses and increases efficiency. A couple of Si8230BD ICs installed on the PCB's solder side drive the primary switching FETs.
This PSU's single micro-controller is an STMicroelectronics STM32F302 that provides the full-speed USB interface through which the TPG-1500D-T communicates. This MCU contains an ARM Cortex-M4 clocked at 72 MHz, and it also uses fast voltage comparators, a couple of op-amps with programmable gain, a fast 12-bit DAC, and 144 MHz motor control timers. An SKC-8 clock oscillator is also used.
The -12V rail is generated by a STMicroelectronics L7912CV regulator, which can handle up to 1.5 A.
The FETs that generate the +12V rail are installed on a vertical PCB close to the main transformers, reducing energy losses especially under high loads. At the same time, the +12V board is close to the modular PCB as well, so current passes through shorter distances with decreased resistance. Several ferrite rings are installed between the modular and +12V boards in an effort to suppress EMI noise.
The electrolytic caps that filter the +12V rail are provided by Unicon and rated at 125 °C, thanks to the solid electrolyte that they use. Unicon is a respected brand, but we'd like to see even higher-quality caps in such an expensive PSU, perhaps from Rubycon's or Chemi-Con's high-end lines. The other electrolytic caps, used by the minor and 5VSB/-12V rails, are sourced from Rubycon and Chemi-Con. A number of Unicon polymer caps are also used for filtering purposes.
A couple of DC-DC converters generate the minor rails. Each converter uses two Infineon BSC018NE2LS along with a single Anpec APW7073 PWM controller. Lastly, polymer caps most likely provided by Unicon filter these rails.
We found a loose thermistor on one of the VRMs, which we secured in place with glue.
At the front side of the modular PCB, several polymer caps, provided by Unicon, filter the rails.
The protections IC is a SITI PS223, which supports OTP out of the box and also offers OCP for two +12V rails. Of course, this PSU only has one.
The soldering quality is pretty good. Enhance generally has good production lines and tight quality control, so its implementations are typically built well.
We spot a AT1001Z-DSF002 on the solder side. It's used to convert the analog signal to a PWM duty cycle, which feeds an energy measurement processor. In essence, this IC helps the MCU to monitor the PSU's in and out power in real time.
The fan is made by Hong Sheng and its model number is A1425L12S. This is a high-speed fan supported by a somewhat aggressive profile, so it is quiet only under light loads. According to Thermaltake, this fan uses a hydro-dynamic bearing. Moreover, there is a LED strip installed on the fan, which can be controlled through the DPSApp.
Although the TPG-1250D-T uses the same model, the TPG-1500D-T's fan is able to spin at significantly higher speeds, so these two fans clearly aren't identical. According to Thermaltake, the fan's blades allow for high static pressure, improving cooling. In addition, anti-vibration rubber pads are used on the frame's four corners for lower noise output.