Evaluation Board Description - Analog Devices EVAL-ADM1075EBZ User Manual

EVAL-ADM1075EBZ User Guide

EVALUATION BOARD DESCRIPTION

The evaluation board is designed to demonstrate many different
features of the ADM1075. Not all components are required in a
typical design. The functional block diagram in Figure 1 shows
the key components of the evaluation board.
The typical lab setup is shown in Figure 2. The hot-swap line input
voltage is connected across the RTN IN and −48V IN connectors.
A resistive load can be connected across RTN OUT and −48V
OUT. The mini-USB connector is used to supply 5 V power to the
isolated section of the board while the
connected to the 10-way connector, SK3, for isolated I
communication.
–48V RTN (0V)
R
DROP
= 3kΩ
VIN
1μF
825kΩ 560kΩ
VEE
UVH
UNDERVOLTAGE
UVL
OVERVOLTAGE
OV
ADC_V
11.3kΩ
16kΩ
VCAP
ISET
1μF
–48V
USB-SDP-CABLEZ
2 C
SPLYGD
V AND
CC
POWER
REFERENCE
ACCUMULATOR
GENERATOR
POWER
MULTIPLIER
AND
DETECTOR 12-BIT ADC
FET POWER
FOLDBACK
CONTROL
FAULT TIMER
GATE CONTROL
CURRENT LIMIT
TIMER SS
470nF
Figure 1. Functional Block Diagram
Isolation is required in most −48 V applications because there is a
large ground potential difference between the −48 V section of the
board and a PC or microcontroller. The
demonstrate I
to demonstrate isolation of other digital signals. The
provides quad-channel digital isolation with isoPower®. An
integrated dc-to-dc converter provides up to 500 mW of regulated,
isolated power from the isolated side to the −48 V side. When
the isolated section is powered, the isoPower is switched in to
is
power the 5 V components on the primary side of the board.
SHDN RESTART
LATCH
GPO1/ALERT1/CONV
GPO2/ALERT2
DIGITAL
SDAO
AND
SDAI
PMBus
SCL
ADR
ADC_AUX
PWRGD
DRAIN
PLIM
VEE
GATE
SENSE+
SENSE–
VEE_G
VEE
Rev. C | Page 3 of 19
ADuM1250
2 C isolation on the board, and the
ADuM3200
C
LOAD
= 680μF
ADuM1250
VEE
LATCH
GPO2
1.8MΩ
ADuM5404
SPLYGD
150kΩ
1kΩ
N-FET
= 2mΩ
R
SENSE
UG-304
is used to
ADuM3200 is used
ADuM5404
SHDN_ISO
RESTART_ISO
SDA_ISO
SCL_ISO
LATCH_ISO
GPO2_ISO
PWRGD_ISO
SPLYGD_ISO