ADM1041ARQ datasheet(3/64 Pages) AD

Il numero della parte	ADM1041ARQ

Spiegazioni elettronici	Secondary-Side Controller with Current Share and Housekeeping

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ADM1041

Rev. A | Page 3 of 64

GENERAL DESCRIPTION

The ADM1041 is a secondary-side and management IC specifi-

cally designed to minimize external component counts and to

eliminate the need for manual calibration or adjustment on the

secondary-side controller. The principle application of this IC is

to provide voltage control, current share, and housekeeping

functions for single output in N+1 server power supplies.

The ADM1041 is manufactured with a 5 V CMOS process and

combines digital and analog circuitry. An internal EEPROM

provides added flexibility in the trimming of timing and voltage

and selection of various functions. Programming is done via an

SMBus serial port that also allows communication capability

with a microprocessor or microcontroller.

The usual configuration using this IC is on a one per output

basis. Outputs from the IC can be wire-ORed together or bused

in parallel and read by a microprocessor. A key feature on this

IC is support for an OrFET circuit when higher efficiency or

power density is required.

SAMPLE APPLICATION CIRCUIT DESCRIPTION

Figure 1 shows a sample application circuit using the ADM1041.

The primary side is not detailed and the focus is on the secon-

dary side of the power supply.

The ADM1041 controls the output voltage from the power

supply to the designed programmed value. This programmed

value is determined during power supply design and is digitally

adjusted via the serial interface. Digital adjustment of the

current sense and current limit is also calibrated via the serial

interface, as are all of the internal timing specifications.

The control loop consists of a number of elements, notably the

inputs to the loop and the output of the loop. The ADM1041

takes the loop inputs and determines what, if any, adjustments

are needed to maintain a stable output. To maintain a stable

loop, the ADM1041 uses three main inputs:

•

Remote voltage sense

•

Load current sense

•

Current sharing information

In this example, a resistor divider senses the output current as a

voltage drop across a sense resistor (RS) and feeds a portion

into the ADM1041. Remote local voltage sense is monitored via

VS+ and VS− pins. Finally, current sharing information is fed

back via the share bus. These three elements are summed

together to generate a control signal (VCMP), which closes the

loop via an optocoupler to the primary side PWM controller.

Another key feature of the ADM1041 is its control of an OrFET.

The OrFET causes lower power dissipation across the ORing

diode. The main function of the OrFET is to disconnect the

power supply from the load in the event of a fault occurring

during steady state operation, for example, if a filter capacitor or

rectifier fails and causes a short. This eliminates the risk of

bringing down the load voltage that is supplied by the redun-

dant configuration of other power supplies. In the case of a

short, a reverse voltage is generated across the OrFET. This

reverse voltage is detected by the ADM1041 and the OrFET is

shut down via the FG pin. This intervention prevents any

interruption on the power supply bus. The ADM1041 can then

be interrogated via the serial interface to determine why the

power supply has shut down.

This application circuit also demonstrates how temperature can

be monitored within a power supply. A thermistor is connected

between the VDD and MON2 pins. The thermistor’s voltage varies

with temperature. The MON2 input can be programmed to trip

a flag at a voltage corresponding to an overheating power supply.

The resulting action may be to turn on an additional cooling

fan to help regulate the temperature within the power supply.

RSENSE

ADM1041

PWM +

PRIMARY

DRIVER

OPTO-

COUPLER

AC PULSE

SENSE

DIFF CURRENT

SENSE

OrFET

CONTROL

ERROR

AMP

EEPROM AND

RAM AND TRIM

SMBus

CURRENT

SHARE

DIFF LOAD AND LOCAL

VOLTAGE SENSE

VOLT, TEMP MONITOR

AND FAULT DETECTION

SOFT

START

SHARE

BUS

µC

(

µC OR STANDALONE

OPERATION)

LOAD

Figure 2. Application Block Diagram

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