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Secondary-Side Controller with
Current Share and Housekeeping
ADM1041
PRODUCT FEATURES
Digital calibration via internal EEPROM
Supports SSI specification
Comprehensive fault detection
Reduced component count on secondary side
Standalone or microcontroller control
SECONDARY-SIDE FEATURES
Generates error signal for primary-side PWM
Output voltage adjustment and margining
Current sharing
Current limit adjustment
OrFET control
Programmable soft-start slew rate
Standalone or microcontroller operation
Differential load voltage sense
AC mains undervoltage detection (ac sense)
Overvoltage protection
RS
INTERFACE AND INTERNAL FEATURES
SMBus interface (I 2 C compatible)
Low-drift precision 2.5 V reference
Voltage error amplifier
Differential current sense
Sense resistor or current transformer option
Overvoltage protection
Undervoltage protection
Overcurrent protection
Overtemperature protection
Start-up undervoltage blanking
Programmable digital debounce and delays
352-byte EEPROM available for field data
160-byte EEPROM for calibration
Ground continuity monitoring
APPLICATIONS
Network servers
Web servers
Power supply control
OrFET
V OUT
R LOAD
GND
V DD
PWM
CONTROLLER
V DD
BIAS
ADM1041
SHARE BUS
V DD
V DD
V DD
THERMISTOR
CBD
C S –/V LS
C S +
V DD
V CMP
ICT
F G
F D
SHRO
SHRS
V S +
V S –
V OUT
V S +
V S –
PULSE AC_OK
OTP
MON2
PEN
DC_OK
PSON
V DD
C CMP
SCMP
GND
ADD0
SCL
SDA
MICRO-
CONTROLLER
OPTIONAL
ISOLATION BARRIER
Figure 1. Typical Application Circuit
Rev. A
Information furnished by Analog Devices is believed to be accurate and reliable.
However, no responsibility is assumed by Analog Devices for its use, nor for any
infringements of patents or other rights of third parties that may result from its use.
Specifications subject to change without notice. No license is granted by implication
or otherwise under any patent or patent rights of Analog Devices. Trademarks and
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 www.analog.com
registered trademarks are the property of their respective owners.
Fax: 781.326.8703
? 2004 Analog Devices, Inc. All rights reserved.
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