Industry Background: The Explosive Growth of AI Computing Power Drives Upgrades to Power Supply Architectures
With the rapid development of large-scale AI model training and cloud computing data centres, clusters of high-density servers and AI accelerator cards are placing unprecedentedly stringent demands on power supply systems in terms of power density, conversion efficiency, stability and integration. Traditional power supply solutions are gradually revealing bottlenecks in terms of size, energy efficiency, load adaptability and thermal management, and are no longer capable of meeting the power supply requirements for high-density computing equipment operating under a 48V high-voltage bus architecture.
Against this backdrop, the 48V two-level power supply architecture has become the mainstream solution in data centres, whilst the IBC (Intermediate Bus Converter), as the core power unit for converting 48V to 12V, directly determines the overall power supply efficiency, thermal performance and long-term operational reliability of the system. As the leading supplier in the global AI server power supply market, with a share of approximately 60 per cent in NVIDIA’s supply chain, Delta has launched the Q50SN12072 1/4-brick isolated LLC resonant IBC power module—a benchmark product specifically designed to meet these market demands.
Product Overview: Industrial-standard 1/4-brick IBC power module
The Delta Q50SN12072 is an isolated LLC resonant IBC (Intermediate Bus Converter) power module that strictly adheres to the industrial standard 1/4-brick form factor. Designed specifically for 48V-to-12V power supply applications in high-density cloud computing and AI servers, this module delivers excellent conversion efficiency and operational stability at high power densities, fully meeting the demanding requirements of 24/7, full-load operation in data centres.
Adopting the industrial standard 1/4-brick form factor, the module measures just 58.48 × 36.94 × 11.56 mm and weighs only 71 g, making it perfectly suited to the high-density layout requirements of server PCBs whilst reserving ample hardware space for computing chips, graphics memory and peripheral expansion.
Appearance of the Delta 1/4-brick IBC power module
Key Technical Specifications
Product Model: Q50SN12072RNDHQ / Q50SN12072
Package Type: 1/4-brick industrial standard package
Input Voltage: 38–60 V DC (wide DC bus)
Maximum Input Current: 26 A
Output Voltage: 12 V DC
Output Current: 72 A
Maximum Output Power: 864 W
Peak Efficiency: Up to 98.3% (@54 Vin)
Dimensions: 58.48 × 36.94 × 11.56 mm
Weight: 71 g
Intelligent Monitoring: Comprehensive PMBus digital monitoring system
Advanced Topology: LLC Resonant + IBC Isolation Hybrid Solution
The Delta Q50SN12072 employs an industry-leading LLC resonant + IBC isolation hybrid topology, which, unlike traditional hard-switching power supply topologies, addresses industry challenges such as high-frequency switching losses, voltage fluctuation interference and insufficient isolation safety at a fundamental level:
LLC Resonant Topology: Enables soft-switching operation across the entire load range, significantly reducing conduction and turn-off losses in the switching devices, effectively suppressing high-frequency electromagnetic interference (EMI), and improving overall conversion efficiency. Its peak efficiency reaches 98.3 per cent, placing it at the forefront of the industry.
IBC Isolation Architecture: This provides complete electrical isolation between input and output, offering exceptional resistance to surges and voltage differential shocks. It completely isolates 48V bus-side voltage fluctuations and harmonic noise from affecting downstream 12V load equipment, perfectly meeting the high-precision and high-stability power supply requirements of AI servers.
Analysis of the Core Component Solution
The Delta Q50SN12072 utilises an integrated solution from Infineon, offering industry-leading levels of integration and reliability:
Main Control Chip: Equipped with the Infineon XDPP1100-Q024 digital power controller, which features a built-in Cortex-M0 processor core and is responsible for LLC resonant control, synchronous rectification timing management, PMBus communication and system fault protection. This chip integrates a hardware LLC frequency modulation control module, multiple DPWM output channels and multiple ADC acquisition ports, providing the core computational power required for the module’s intelligent operation.
Power MOSFETs: The LLC half-bridge utilises Infineon OptiMOS 5 series power MOSFETs:
BSC050N10NS5: 100 V rated voltage, on-resistance 5 mΩ
BSC052N08NS5: 80 V rated voltage, on-resistance 5.2 mΩ
The ultra-low on-resistance effectively reduces power loss and improves overall conversion efficiency.
Synchronous rectifier MOSFETs: Vishay series MOSFETs are used:
SIR680ADP: 80 V rated voltage, on-resistance 2.88 mΩ
SIR626LDP: Rated voltage 60V, on-resistance 1.5mΩ
Other key components include Texas Instruments’ (TI) INA195 current sense amplifier, LM5108 half-bridge gate driver, LM34927 high-voltage synchronous buck regulator, and UCC27524 dual-channel high-speed low-side gate driver.
Thermal Design: The rear of the module is fitted with an aluminium alloy heat sink, with thermal compound filling the gap between the PCB and the heat sink to ensure long-term reliable operation at high power densities.
Intelligent Digital Monitoring: PMBus-enabled smart management
The Q50SN12072 is equipped with a comprehensive PMBus digital monitoring system, supporting:
Real-time monitoring: Real-time monitoring of key parameters such as voltage, current and temperature
Fault protection: Multiple protection mechanisms including overvoltage, overcurrent and overtemperature
Multi-module Parallel Operation for Capacity Expansion: Supports parallel operation of multiple modules to meet high-power supply requirements
24/7 Uninterrupted Operation: Meets the reliability requirements of data centres operating year-round
It is worth noting that this module has gained mainstream Linux kernel support, with relevant patches having been merged into the mainline codebase, reflecting its widespread recognition and technical maturity within the open-source ecosystem.
Typical Applications in Cloud Computing and AI High-Density Servers
The Delta Q50SN12072 is precisely tailored to meet the core power supply requirements of next-generation AI computing and cloud computing high-density servers, and is widely used in the following scenarios:
AI training clusters: Provides an efficient and stable 12V power supply for large-model training servers, supporting the high current demands of computing chips such as GPUs and TPUs
Cloud computing data centres: Serving as the core conversion unit for converting 48V DC bus to 12V, it is widely used in rack-mounted servers, network switches, storage arrays and other equipment
High-density servers: The compact 1/4-brick form factor is perfectly suited to high-density layouts, providing rated power to core components such as CPUs, memory and AI accelerator cards
AI accelerator card clusters: Supports simultaneous full-load operation of multiple chips, effectively addressing the power supply challenges posed by high loads and instantaneous high currents in AI computing clusters
Mingjiada Electronics – Your local specialist supplier of Delta power modules
With nearly thirty years’ experience in the distribution of electronic components, Mingjiada Electronics leverages its robust direct manufacturer channels and extensive warehouse stock to provide one-stop power module supply services for the cloud computing and high-density AI server sectors. For the Delta Q50SN12072 power module, Mingjiada Electronics offers:
Brand-new, genuine products: ensuring every module is manufactured by Delta
Immediate availability: stocked in multiple warehouses across Shenzhen and Hong Kong for rapid response to customer needs
Competitive pricing: leveraging a global supply chain to provide cost-effective solutions
Contact us:
Address: Rooms 1239–1241, Block B, Guoli Building, Phase II, New Asia, Zhenzhong Road, Futian District, Shenzhen
Tel: +86 13410018555
Email: sales@hkmjd.com
Website: https://www.integrated-ic.com/
Tags: Q50SN12072RNDHQ, Q50SN12072RNDH, Q50SN12072RND, Q50SN12072RN, Q50SN12072R, Q50SN12072
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