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ON Semiconductor’s Energy Efficient Computer Power Solutions

Posted on: 02/19/2022

As a supplier of high-performance silicon solutions for high-efficiency Electronic products, ON semiconductor has a strong market position in high-efficiency computer power solutions, and is the world’s leading supplier of desktop power solutions. The market share of adapter power solutions also ranks first. ON semiconductor’s computer power solutions provide important features such as high performance, high energy efficiency, and high integration, and are used in various major subsystems of desktops, notebooks and netbooks, such as central processing unit (CPU) power supply, thermal management, power supply and adapters Power conversion, high-speed interface switching and protection, etc. The newly introduced CPU power management and high-speed interface solutions have been optimized to match Intel’s newly released Sandy Bridge processors. This article will focus on the newly introduced computer power solutions from ON Semiconductor to help engineers choose the right new product.

Newest High Performance Combo Controller for 80 PLUS Gold/Platinum Energy Efficient ATX Power Supply Designs

Desktop computers have always been an important target for energy-efficiency regulatory agencies. As a leading manufacturer, ON Semiconductor continues to introduce ATX power supply controllers that meet the latest energy efficiency specifications. For example, ON Semiconductor’s new NCP1910 high-performance combo controller for ATX power supplies integrates power factor correction (PFC) and main power segment controllers for desktop PC power supplies into a single IC solution. The device features continuous conduction mode (CCM) power factor correction and half-bridge resonant dual Inductor plus single capacitor (LLC) converters for energy efficient 80 PLUS Gold/Platinum energy efficiency designs.

The NCP1910 combines a PFC and LLC controller in a single chip, integrating all the handshaking functions required by these two converters, improving reliability and enabling simpler, higher-density designs. The NCP1910 is designed for ATX, all-in-one, and server power supplies in a SOIC-24 package. Figure 1 shows the product schematic of the NCP1910.

Figure 1: Schematic diagram of the NCP1910 product.

High-efficiency Vcore Power Controller Solution Compliant with Various VR Specifications

ON Semiconductor offers a complete line of multi-phase or single-phase Vcore controllers for desktops, servers and notebooks, including:

NCP6151/6121 (using Flex Mode + Dual Edge architecture, conforming to VR12 specification);

 NCP6131/6132 (using Flex Mode + Dual Edge architecture, in line with IMVP7 specification);

 ADP4000/3290/3293 (using Flex Mode architecture, conforming to VR11.1 specification);

 ADP3210/3211/3212/3218 (using Flex Mode architecture, in line with IMVP6.5 specification);

 NCP5392/5395 (using Dual Edge architecture, compliant with VR11.1 specification); and

 NCP5393 (using Dual Edge architecture, conforming to AM2+ specification), etc.

ON Semiconductor’s multiphase buck controllers combine differential voltage and current sensing with adaptive voltage positioning to power the latest generation of CPUs. Dual Edge and Flex Mode Pulse Width Modulation (PWM) control combined with inductor current sensing provides extremely fast initial response to transient events, allowing the use of smaller large ceramic capacitors for transient load lines Require. These controllers integrate high-performance operational error amplifiers to easily compensate for the system. ON Semiconductor’s proprietary dynamic reference injection technology makes this error amplifier compensation virtually independent of the system’s response to voltage identification (VID) changes, eliminating the trade-off between overshoot and dynamic VID performance.

It is worth mentioning that NCP6151, NCP6121, NCP6131 and NCP6132 are the latest high-efficiency power management devices launched by ON Semiconductor in conjunction with the second-generation Intel® Core™ processor series (ie Sandy Bridge). They all offer user-configurable phase configuration and integrate true differential voltage sensing, differential inductor DC resistance (DCR) current sensing, input voltage feedforward, and adaptive voltage positioning for precise power stabilization. Each device provides a split current loop configuration to reduce tuning time and complexity, thereby simplifying design-in; among them, dual-edge PWM combined with DCR current sensing Load events provide the fastest initial response. The nonlinear transient response of the control loop meets the requirements of high-performance applications, while the slew rate of 30 mV/s, combined with the feed-forward function, minimizes charge and discharge times for energy-efficient operation. Automatic “phase cut” to single-phase operation during light load operation further improves energy efficiency. Of these devices, the NCP6151 is a 2/3/4-phase CPU controller and a single-phase graphics processing unit (GPU) controller for server applications, and the NCP6121 is a 1/2/3-phase CPU controller for desktop PCs and single-phase GPU controller, while NCP6131 is a 3-phase CPU controller and single-phase GPU controller for notebooks.

These NCP61xx controllers combine the industry’s smallest MOSFET driver NCP5901 (in SOIC-8 Narrow Body or DFN8 2.0×2.0×0.9mm) or NCP5911 integration from ON Semiconductor, and the new NTMFS49xx, NTTFS49xx, NTD49xx or NTMS49xx high-end optimized for energy efficiency Regulated MOSFETs, enabling customers to create complete power supply solutions for client and enterprise levels. The 11 new high-efficiency MOSFETs in this family use advanced silicon technology and are optimized to provide the best switching performance in buck converter control-side applications. Each new device offers extremely low gate charge (Qg) and gate impedance (Rg) to minimize switching losses and improve signal quality; low capacitance to minimize driver losses; low on-resistance ( RDS(ON)) to improve overall energy efficiency. Shown in Figure 1 are application Circuit diagrams that combine desktop and notebook Vcore power schemes using these devices, respectively.

Figure 2: Application circuit diagram of desktop and notebook Vcore power solutions.

System Power, Chipset and DDR Power Controller Solutions

In addition to providing solutions for CPU power management, ON Semiconductor also provides power controller solutions for system power, chipsets, and DDR memory (see Table 1). Taking the netbook application as an example, in addition to the ADP3211A single-phase buck controller for CPU power management, ON Semiconductor’s different controller solutions for system power, chipset and DDR power can also be used.

For example, ON Semiconductor’s single synchronous rectifier buck controller NCP5217 can be used in a netbook application. This device is one of the best power solutions for system, I/O and memory performance, supporting an input voltage range of 4.5 V to 27 V, offering a wider range of voltages from 3.3 V to 0.8 V, comprehensive protection features, and Selectable power saving modes for improved light load efficiency. In addition, the feedforward control provided by the NCP5217 can still provide a constant output voltage when there is a large input voltage change in the netbook application. This control architecture enables interleaving between groups of power supplies, which reduces the bill of materials cost of the input capacitors.

  

Table 1: ON Semiconductor’s Controller Solutions for Computer System Power, Chipset and DDR Power

Computer applications such as desktop, server, and notebook computers with different package MOSFETs that provide higher energy efficiency mainly require low voltage MOSFETs with voltages up to 30 V. ON Semiconductor provides a rich selection of N-channel and P-channel MOSFETs for these applications (see ON Semiconductor’s “Computer Power Solutions Selection Brochure” for details). These MOSFETs are available with a drain-source voltage (VDS) of 30 V, -30 V or 25 V in SO8-FL 5×6 mm, μ8FL 3.3×3.3 mm, DPAK, SOIC-8 5×6 mm or ICEPAK etc. Different packages provide high energy efficiency for computer power applications. Among them, MOSFETs in ICEPAK packages are used to increase the power density of power switches.

It is worth mentioning that ON Semiconductor has recently launched 30 V MOSFET products with integrated Schottky diodes for applications such as computers, including NTMFS4897NF, NTMFS4898NF and NTMFS4899NF. Housed in a compact 5 mm x 6 mm SO-8FL package, these MOSFETs feature maximum on-resistance (RDS(on)) values ​​of 2 mΩ, 3 mΩ, and 5 mΩ at 10 V, respectively. Optimized for the synchronization side to achieve higher power efficiency. Typical gate charge (at 4.5 V gate-source voltage (Vgs)) specifications are 39.6 nanocoulombs (nC), 25.6 nC and 12.2 nC, respectively, ensuring that switching losses are also kept to a minimum. Integrated Schottky diodes reduce dead-time conduction losses by being integrated into the same die as the primary FET structure, thereby increasing energy efficiency and improving waveforms.

Thermal Sensors, Fan Controllers and System Monitors

ON Semiconductor offers a complete selection of remote thermal sensors, fan controllers and system monitors for computer applications. Among them, the thermal sensor converts the temperature data into digital format and transmits these data information through the SMBus bus. Temperature set points and limits may also be programmed via this bus. Temperature information can be used to dynamically control fan speeds, reduce audible noise and power consumption, and enhance system reliability. The advanced system monitoring solution brings voltage and current monitoring, battery detection, flash memory and GPIO functions, providing a complete set of system health monitoring and controllers.

These computer thermal management devices include the ADM1026/27/29/30/31, ADT7460/63/62/67/68/73/75/76, ADM1033/34/32, ADT7490/61A/21/81/82/83A/ 84A/85A/86A/88A, NCT75 and NCT214 etc.

Computer high-speed interface switch device and low-capacitance protection device

ON Semiconductor provides a variety of switching devices for high-speed interfaces such as PCI Express (PCIe), DisplayPort, Gigabit Ethernet (GbE), and USB 2.0 in computer applications such as servers, desktops, notebooks, and netbooks. Taking the server application as an example, the schematic diagram of the relevant application and the devices that can be used are shown in the following figure.

Figure 3: ON Semiconductor’s switch device model and application diagram used in servers.

In terms of high-speed interface protection for computer applications, ON Semiconductor also offers a variety of options (see Table 2). Among these protection schemes, there are both traditional ESD protection schemes and the new PicoGuard XS protection scheme (see Figure 4). ON Semiconductor’s high-speed interface protection product family combines extremely high signal integrity with the industry’s best clamping voltage to ensure the highest level of protection for sensitive high-speed interfaces.

Table 2: ON Semiconductor’s different protection schemes for different high-speed interface applications.

It is worth mentioning that ON Semiconductor’s new PicoGuard XS® architecture maintains the signal integrity of high-speed data interfaces while providing enhanced ESD protection. This architecture routes up and through the package, rather than under the package, thereby eliminating trace parasitics. This approach integrates the inductor with the ESD diode to match the signal line impedance, thereby eliminating any type of external compensation. The integrated inductor reduces the clamping voltage and residual current flowing into the protected ASIC, thereby improving ESD protection.

Figure 4: Traditional ESD protection design compared to the new PicoGuard XS architecture.

Summarize:

As a supplier of high-performance silicon solutions for energy-efficient Electronic products, ON Semiconductor provides high-performance, energy-efficient and highly-integrated solutions for computer applications such as desktops, servers, and notebooks. Such as central processing unit (CPU) power supply, thermal management, ATX power supply and adapter power conversion, high-speed interface switch and protection, etc. ON Semiconductor also continues to introduce the latest products for computer applications, such as CPU power management and related devices compatible with Intel’s latest processor platform, ATX power combination controller compatible with the latest energy efficiency specifications, and innovative technologies to better protect high-speed interface applications. protection devices, etc. With these high-performance, energy-efficient solutions from ON Semiconductor, customers can develop products that are more competitive in the market.

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