EVAL-ADM1073MEB Analog Devices Inc, EVAL-ADM1073MEB Datasheet - Page 11

• Manufacturer Part Number: EVAL-ADM1073MEB
• Description: BOARD EVAL MICRO FOR ADM1073
• Manufacturer: Analog Devices Inc

Specifications of EVAL-ADM1073MEB

• Main Purpose: Power Management, Hot Swap Controller
• Utilized Ic / Part: ADM1073
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Secondary Attributes: -
• Embedded: -
• Primary Attributes: -

OPERATING THE MICRO EVALUATION BOARD
The EVAL-ADM1073EB evaluation kit contains a second
evaluation board, the EVAL-ADM1073EB micro evaluation
board, which is designed to drop onto a plug-in module or a
backplane, replacing the current hot swap device. The perform-
ance of the ADM1073 can then be evaluated within your
system.
The micro evaluation board contains a subset of the main
evaluation board components :
•
•
•
•
•
•
•
By cutting various tracks around the current hot swap device in
a user system and soldering the ADM1073 micro evaluation
board in position above it, the ADM1073 and its external
components can be integrated into the system in place of the
original hot swap circuitry. This allows the user to evaluate the
ADM1073’s performance in the system itself.
R1
R2
R
TIMER
On-board FET to control load current
Programmable operating voltage range (R1 to R4)
Programmable current limit levels (value of R
Programmable soft start ramp (Capacitor C
Programmable TIMER on-time
LEDs on all logic I/Os
Pushbutton switches for asserting logic inputs
R1
R2
Figure 8. Micro Evaluation Board Functional Block Diagram
C
TIMER
C
R
SS
DROP
OV
UV
TIMER
SS
V
ADM1073
IN
SENSE
DRAIN
GATE
V
EE
Q1
R
SENSE
SS
J1–2
J1–1
J1–3
)
SENSE
)
–48V RTN
–48V OUT
–48V IN
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SETTING UP THE MICRO EVALUATION BOARD
You can set up the micro evaluation board in various
configurations, as follows:
1.
2.
3.
4.
5.
6.
7.
Choose a shunt resistor. A default R
mounted on the micro evaluation board. A constant
voltage of 12.3 V (above V
Choose values for Resistors R1 to R4 to suit the desired
operating voltage range and hysteresis levels. The default
resistors values (R1/R3 = 39 kΩ, R2/R4 = 1 kΩ) give an
operating range of~34.5 V to ~78 V with hysteresis levels of
~200 mV on UV and OV. See the ADM1073 data sheet for
other resistor ratios and their operating ranges. Note that
1% accurate resistors should be used for accuracy.
Choose the maximum load current that is permitted before
the ADM1073 registers a current fault. This is determined
by the choice of sense resistor, R
board has a 33 mΩ sense resistor by default, which sets up
a maximum inrush current level of 3.12 A and maximum
load current level of 2.61 A. R
the load current level. See the ADM1073 datasheet for
details. Note that 1% accurate resistors should be used for
accuracy.
Choose a value for the soft start capacitor, C
capacitor is connected between the SS pin and V
adjusts the soft start current profile at initial connection.
Different value capacitors can be soldered in. See the
ADM1073 data sheet for details.
Choose values for the TIMER capacitor, C
TIMER resistor, R
of the limited consecutive retry scheme. Different capacitor
and resistor values can be soldered. See the ADM1073 data
sheet for details.
Choose the value of the drain resistor required for linear
limit foldback via a shorting link in Header L4. A default
value of 2.2 MΩ is mounted on the micro evaluation board,
but you can alter this component, if required.
The micro evaluation board has an IRF3910 DPAK FET
mounted by default. If you want to change this FET,
remove the component, Q1, and mount a replacement.
Note that a dual footprint is present on the micro
evaluation board that can accommodate DPAK and
D2PAK packages.
TIMER
. These components set the on-time
EE
) is generated at the V
SENSE
SENSE
EVAL-ADM1073EB
can be changed to alter
DROP
(R6). The evaluation
of 20 kΩ is
TIMER
SS
. This
, and the
EE
IN
. It
pin.