By connecting idac to the feedback node of a voltage regulator, i dac can change the output voltage of the regula dac dac. Optional industry standard 5pins for intermediate bus architectures industryleading power density for telecom and datacom 129147w sq. The power stamp alliance purpose the purpose of the power stamp alliance is to facilitate market competition by developing product standards based on stmicroelectronics ics. The isl69128 uses a proprietary digital linear synthetic current modulation scheme to achieve the industrys best. Through its pmbus interface, the ltc7106 receives a 7bit dac code and converts this value to a bidirectional analog output current through the pin idac. The relationship between the pmbus parameter and the real world value is given by the formula. The reference designs demonstrate the following modes. Smbus is built upon i 2c with some differences in timing, dc parameters, and protocol. Older pmbus specifications outline previous protocols. Support at least one of the nonmanufacturer specific commands given in part ii of the pmbus specification. As a result, it is not necessary to set a group id number.
General aspects introduces the pmbus stack and provides a brief description of the needed microcontroller resources and the bus protocols. Order direct from vicor, manufacturers of power components and systems. Pmbus is an open standard owned and regulated by the system management interface forum smif smif membership is open to all royalty free released specifications are freely available works with all types of power management products. Pmbus makes to smbus, refer to pmbus specification. If the output terminal has a prebias voltage, the output voltage directly increases from the prebias voltage to the rated voltage after the converter starts. Dec 07, 2015 pmbus works with all types of power management products, ac to dc power supply, isolated dc to dc break converters and bus converter modules, nonisolated pointofload converters, hotswap controllers and subsystem power monitors, supply sequencers and pointofload voltage programmers, and monitors and fan controllers. The pmbus interface provides for converter configuration as well as monitoring of key. The ltc7106 is a pmbus controlled 7bit da converter current source.
The pmbus specification working group has released the pmbus 1. Addressing is 7bit, with a default address value of 0x55. Pmbus specification, but this is a value that has no function and no dependent parameters in either the max15301 device or in the pmbus specification. Calibration procedure includes instructions on the calibration procedure of the mcp19111 pmbus protocolenabled pointofload converter reference design. Using the pmbus protocol on a serial comm link electronic.
Smbus data transfer format the smbus uses the ack signal to detect the presence of detachable devices on th e bus, so a device must always ack its own address when the host accesses it. This flexible and highly versatile standard allows for communication between devices based on both analog and digital technologies, and provides true interoperability, which will reduce design complexity and shorten time to market for power system designers. The pmbus can be used to control and monitor the brds converter. The updated specification adds features and improves performance of pmbus 1. Pmbus stack users guide preface introduction this chapter contains general information that will be useful to know before using the pmbus stack users guide. The power management bus pmbus is a variant of the system management bus smbus which is targeted at digital management of power supplies. Pmbus compatible, nonisolated dcdc integrated fet converters, capable of highfrequency operation and delivering 20a, or 30a current output from a 5 mm. Pmbus monitoring graphical user interface users guide. Max15301 pmbus command set users guide rev 1 page 2 of 53 introduction maxim integrated intune digital power products utilize the pmbus command standard for configuration, control and. This includes the function parameters, return values, and usage conditions. The world leader in high perf ormance signal processing solutions pmbustm di it l digital pfc controller with integrated ac power metering marco soldano power systems. August 2010 doc id 286 rev 2 143 an2511 application note pmbustm interface using st7 i2c introduction the pmbus tm power management bus is an open standard protocol that defines a means of communicating with power conversion and other devices. Using pmbus can increase power density and reliability of power supplies and optimize component performance and efficiency with reduced design time, risk and cost.
A pmbus adopter is defined as any company who is a member in good standing of smif, inc. The pmbus comm protocol provides an interface for power supplies and synchronous buckboost converters. This specification defines a protocol to manage power converters. Pmbus swift buck converters device description vin v vout v iout a integrated mosfets pmbus telemetry frequency synch. This document is the official specification of the smbus interface. The pmbus smartvid controller reference designs show you how to interface the smartvid controller ip core with the power management bus or pmbus control system. The address can be changed using a custom command and stored in the nonvolatile memory. The 2361 and 6123 converter housed in a package chip bus converter module bcm evaluation board described in this document is designed to be used with the bcm family of isolated, fixed. Converter with pmbus the ncp4201 is an integrated power control ic with a pmbus interface. If a device accepts a pmbus command code,it must execute that function as described in part ii of the pmbus specification. The industrystandard pmbus protocol facilitates communication with power converters and other devices in a power system. The pmbus standard for digital power management is the result of collaboration between power supply and semiconductor companies. These were the nine things that i felt were important for you to know about pmbus. It is capable of supplying up to 30 a continuous output current 25 a for vout 2.
Tdk corporation announces the introduction of the ijc series of 100a point of load pol nonisolated dcdc converters with pmbus communication these converters utilise adaptive digital control to deliver improved transient response and system stability across a wide range of output capacitance. Pmbus adopters in good standing can download the current pmbus 1. This protocol provides the means to group, configure, analyze and debug the individual components of a distributed. Many converters supporting the pmbus protocol will have a resistive voltage divider between the output and the input to the converters control. Sep 26, 2015 ti has a complete endtoend pmbus powermanagement ic ecosystem. The ltc3882 is a dual, polyphase dcdc synchronous stepdown switching regulator controller with pmbus compliant serial interface. Pmbus power system management protocol specification part ii.
Pmbus power system management protocol specification part i revision1. Tb39, mcp19111 pmbus firmware technical brief ds900039. Instantly convert html files to pdf format with this free online converter. Max20751 multiphase master with pmbus interface and. There are more than 50 members in the pmbus organization. Each pwm channel can produce output voltages from 0. The protocol diagram legend or element key is shown in the figure below. Acdc power supplies isolated dcdc converter and bus converter modules. Pmbus tm management interface requires d44tl1a0 and. The pmbus smbus protocols are more robust than simple i2c byte implementing robust pmbus system software for the ltc3880 nick vergunst. Power management bus pmbus software overview 23 flow chart. Integrated, stepdown switching regulator with pmbus.
Utilizing maxims smartslave ics, the device provides a highdensity and flexible solution that can be tailored to a range of power loads used in communication equipment. Pmbus power system management protocol specification part. Electrical specifications acm16s50cf acdc converter technical manual v1. In particular the first projects will be based on parallel resonantnon resonant multiphase converters with. C, v i 36 to 75 v, sense pins connected to output pins unless otherwise specified under conditions. Mcp19111 supports both 100 khz and 400 khz i 2c bus speeds.
The pmbus can be used to control and monitor the chs400 converter. Pmbus specification pdf older published specs pmbus 1. Ti 48v to pol endtoend pmbus power system block diagram and demonstration. This linear format is a twobyte value that contains an 11bit, twoscomplement mantissa and a 5bit, twoscomplement exponent. Pmbus dcdc converters with power system management features ltc3880 dual output dcdc controller ltc3883 single output dcdc controller ltm4676 dual output module regulator power supply configuration dual single dual sequence, trim margin and supervise u monitor telemetry u manage faults and create fault logs u ltpowerplay gui support u. The pmbus specification also allows the pmbus device manufacturer to decide the criteria for an out of. The interface to the host pc is a standard typea to minib usb cable. Pmbus dcdc converters with power system management. Click the upload files button and select up to 20 html files or zip archives containing html, images and stylesheets. Ltc2978 firmware programmer s getting started guide. The controllers use a constant frequency, current mode architecture that is supported by ltpowerplay software development tool with graphical user interface gui. Pmbus power system management protocol specification. This users guide describes how to use the mcp19111 pmbus protocolenabled pol converter reference design.
I2cbus specification and user manual serial, 8bit oriented, unidirectional data transfers up to 5 mbits in ultra fastmode onchip filtering rejects spikes on the bus data line to preserve data integrity. The evaluation board is used for both the analog control and digital control bcm products. A dedicated adaptive voltage scaling avs bus to statically and dynamically control processor voltages. Pmbus application profile for acdc server power supplies revision 1. Meet all of the requirements of part i of the pmbus specification. Like smbus, it is a relatively slow speed two wire communications protocol based on i. Pmbus 2361 and 6123 chip bcm bus converter evaluation board. Specifications compliant to vr skylake spec v in 40v to 60v 54v typ v out vr 1. Pmbus smartvid controller reference designs eeweb community. The output voltage can be adjusted within the range of 8. Standard commands from the pmbus specification are not described in detail unless there are deviations from the pmbus specification functionality. The number of ics that can be connected to the same bus is limited only by a maximum bus capacitance.
This document lists and describes the pmbus commands implemented in the max15303 digital dcdc converter. It uses a constant frequency, leadingedge modulation, voltage mode architecture for excellent transient response and output regulation. Pmbus licensing electrical engineering stack exchange. Maxim manufacturer specific commands are fully described in this document. Pmbus addressing if the calculated pmbus address is 0d, 11d or 12d, sa0 or sa1 lefts open, default pmbus address 119d is assigned instead.
This document describes how to use the pmbus stack users guide as a development tool to emulate and debug firmware on a target board. This allows interoperability between ics not only on the electrical level but also regarding the command semantics. Prebias startup output voltage adjust using pmbus the converter supports prebias. Also, afaik, powerones claim against pmbus hasnt yet been contested beyond that single lawsuit and appears to be limited to digitallycontrolled dcdc pointofload converters. Maxpowertool002 usbtopmbus interface dongle for power. Older pmbus specifications are publicly available for download on the older specifications page. Refer to usicinterconnect chapter in device reference manual. Pmbus power system mgt protocol specification part ii revision 1. Do not use when adjusting output voltage with pmbus communication. The ltc3880ltc38801 are dual, polyphase dcdc synchronous stepdown switching regulator controllers with an i2cbased pmbus compliant serial interface. Pmbus digital pfc controller with integrated ac power. The power management bus pmbus is an open standard powermanagement protocol. Smbus is a closed standard that requires licensing. The max20743 is a fully integrated, highly efficient switching regulator with pmbus for applications operating from 4.
An important notice at the end of this data sheet addresses availability, warranty. It defines a set of commands and data structures required by power control and management components. Advanced bus converter industry standard eighthbrick with digital pmbus interface 58. The evaluation board is used for both the analog control and digital. This singlechip regulator provides extremely compact, highefficiency power deliver.
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