EVAL-ADM1070EB Просмотр технического описания (PDF) - Analog Devices
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EVAL-ADM1070EB Datasheet PDF : 12 Pages
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EVAL-ADM1070EB
MICROBOARD
The ADM1070 Evaluation Kit contains a second Evaluation
Board. The ADM1070 Micro Evaluation Board is designed to
drop onto a plug-in module or a backplane, replacing the current
hot swap device. The performance of the ADM1070 can then
be evaluated within the user’s system.
The board contains:
• On-board FET to control load current
• Programmable operating voltage range (R1/R2 ratio)
• Programmable current limit levels (value of RSENSE)
• Programmable timing values (Capacitor C1)
RDROP 16k⍀
J1-2 0V
VIN
R1
ADM1070
GATE
UV/OV
SENSE
R2
TIMER
C2
VEE
J1-1 –48V OUT
Q1
RSENSE
J1-3 –48V IN
Figure 7. Microboard Functional Block Diagram
This Microboard contains the external components required by
the ADM1070 to function on the plug-in module or backplane.
By cutting various tracks around the current hot swap device
and soldering the ADM1070 Microboard in position above it, the
ADM1070 and its external components can be integrated into the
system in place of the original hot swap circuitry. The ADM1070’s
performance can now be evaluated in the system itself.
SETTING-UP THE ADM1070 MICROBOARD
The user can set up the ADM1070 Evaluation Board with
different configurations of supply voltage operating range and
maximum allowable load current as follows:
1. Choose values of resistors R1 and R2 to suit the desired
operating voltage range. The default resistors’ values
(R1 = 39 kΩ, R2 = 1 kΩ) give an operating range of 36.4 V
to 77.2 V. See the ADM1070 data sheet for other resistor
ratios and their operating ranges.
2. Choose a maximum load current permitted before the
ADM1070 will register a current fault. This is decided by the
choice of resistor RSENSE. See the ADM1070 data sheet for
full details.
3. The board is set up to use default timing values. A shorting
link is mounted on the board in place of Capacitor C1, tying
the TIMER pin directly to –48 V. If different timing values
are required, a capacitor must be soldered into position in
place of the shorting link. TIMER is now tied to –48 V
through the external capacitor C1. Different values of C1
generate different timing values. See the ADM1070 data
sheet for a full list of capacitor values and the corresponding
timing values.
INTEGRATING THE ADM1070 MICROBOARD WITH THE
USER’S SYSTEM
The user must modify his or her current system to remove the
existing hot swap circuitry and replace it with the ADM1070
Mircoboard. The following description refers to a situation
when the hot swap circuitry resides on a plug-in module. The
same method applies to cases where a backplane side hot swap
system is implemented. First, the existing hot swap device and
its accompanying components must be located. The user must
then disconnect this portion of the system by cutting the relevant
tracks on the board, or alternatively, removing the relevant
components.
CUT
PLUG-IN BOARD
0V
LIVE
BACKPLANE
HOT SWAP
SYSTEM
LOAD
–48V
CUT
Figure 8. Removing Existing Hot Swap Circuitry
from the User’s System
The ADM1070 Microboard can now be integrated into the
user’s system in place of the original hot swap system. The
board should be soldered into position above the old hot swap
circuitry. The ADM1070 Microboard has an insulating coating
on its underside to protect the user’s system. If the underside of
the board was not protected, shorts could occur on the module
or backplane below it.
SOLDER
0V
LIVE
BACKPLANE
–48V
0V
–48V IN
–48V OUT
TERMINAL
BLOCK
ADM1070
MICRO
BOARD
PLUG-IN BOARD
LOAD
SOLDER
Figure 9. Integrating the ADM1070 Microboard
into the User’s System
REV. 0
–5–
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