Analog Devices EVAL-ADM1075MEBZ User manual

EVAL-ADM1075MEBZ User Guide
UG-548
One Technology Way •P. O. Box 9106 •Norwood, MA 02062-9106, U.S.A. •Tel: [phone] •Fax: [phone] •www.analog.com
ADM1075 Mini Evaluation Kit User Guide
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. A | Page 1 of 16
FEATURES
Mini evaluation kit for the ADM1075
Supports LFCSP device package
Input voltage range of −30 V to −75 V
PMBus™ communication supported
Isolated PMBus interface for −48 V operation
Special N-MOSFET footprint to accommodate different
FET packages
Supports up to 2 sense resistors in parallel
Supports up to 2 field effect transistors (FETs) in parallel
Toggle and push-button switches for easy input control
LED indicated status outputs
Smaller board compared with EVAL-ADM1075EBZ
EVALUATION KIT CONTENTS
EVAL-ADM1075MEBZ mini evaluation board
EVAL-ADM1075-ISOZ isolation board
8-way, 150 mm Micro-MaTch ribbon cable
ADDITIONAL EQUIPMENT NEEDED
USB-to-serial I/O interface USB-SDP-CABLEZ
REQUIRED SOFTWARE
Analog Devices hot swap and power monitoring evaluation
software (download from www.analog.com/hotswaptools)
GENERAL DESCRIPTION
The ADM1075 mini evaluation board (EVAL-ADM1075MEBZ) is
a compact, reduced feature version of the ADM1075 evaluation
board (EVAL-ADM1075EBZ) for the ADM1075-1ACPZ and
ADM1075-2ACPZ devices.
The mini evaluation board is designed to power up with a 15 A
current limit, a 300 µF load capacitance, and a minimum of 24 Ω
load resistance.
Two sense resistor footprints and two FET footprints provide
users with flexibility and allow them to simulate a wide range of
application setups.
Multiple test points allow easy access to all critical points and
pins. There is one LED to provide users with a direct visual
indication of IC power good output.
The EVAL-ADM1075MEBZ board is fully compatible with the
EVAL-ADM1075EBZ evaluation software tool, which can be
downloaded from www.analog.com/hotswaptools.
Users need a USB-SDP-CABLEZ USB-to-I2C dongle to use the
evaluation software tools. The Micro-MaTch ribbon cable is
required if connecting the mini evaluation board to the isolation
board (EVAL-ADM1075-ISOZ).
Complete specifications for the ADM1075 can be found in the
ADM1075 data sheet, available at http://www.analog.com/, and
should be consulted in conjunction with this user guide when
using the evaluation board.
BOARD SETUP
Figure 1.
RTNIN
TO PC
–48VOUT
–48VIN
EVAL-ADM1075MEBZ
EVAL-ADM1075-ISOZ
11414-001

UG-548 EVAL-ADM1075MEBZ User Guide
Rev. A | Page 2 of 16
TABLE OF CONTENTS
Features .............................................................................................. 1
Evaluation Kit Contents................................................................... 1
Additional Equipment Needed....................................................... 1
Required Software ............................................................................ 1
General Description......................................................................... 1
Board Setup ....................................................................................... 1
Revision History ............................................................................... 2
Quick Start Guide............................................................................. 3
Evaluation Board Description......................................................... 4
EVAL-ADM1075MEBZ .............................................................. 5
EVAL-ADM1075-ISOZ................................................................6
Evaluation Board Hardware.............................................................7
Switch, Jumper, and LED Functions...........................................7
Test Plots.............................................................................................9
Evaluation Board Schematics and Layout................................... 10
EVAL-ADM1075MEBZ ............................................................ 10
EVAL-ADM1075-ISOZ............................................................. 12
Bill of Materials............................................................................... 15
EVAL-ADM1075MEBZ ............................................................ 15
EVAL-ADM1075-ISOZ............................................................. 16
REVISION HISTORY
4/14—Rev. 0 to Rev. A
Changes to Evaluation Kit Contents .............................................. 1
Changes to Figure 11...................................................................... 10
Changes to Table 11........................................................................ 15
4/13—Revision 0: Initial Version

EVAL-ADM1075MEBZ User Guide UG-548
Rev. A | Page 3 of 16
QUICK START GUIDE
1. Download the hot swap and power monitor software from
www.analog.com/hotswaptools (see the UG-353 user guide
for more information).
2. Connect the mini evaluation board (EVAL-ADM1075MEBZ)
to the isolation board (EVAL-ADM1075-ISOZ) using the
8-way connector and a Micro-MaTch ribbon cable.
3. Connect the isolation board (EVAL-ADM1075-ISOZ) to a PC
through the 10-way connector and the USB-SDP-CABLEZ
dongle. The blue LED, labeled ISO, on the isolation board
illuminates.
4. Connect the power supply to the mini evaluation board
(EVAL-ADM1075MEBZ) using thick wires.
5. To confirm that the boards are configured correctly, set the
output of the power supply to 48 V with less than a 1 A
current limit and with no load capacitance. If the boards
are configured correctly, the green LEDs, labeled
D_PWRGD on the EVAL-ADM1075MEBZ and PWRGD
on the EVAL-ADM1075-ISOZ, illuminate.
6. Press the RESTART push-button on the mini evaluation
board (EVAL-ADM1075MEBZ). The green LEDs, labeled
D_PWRGD and PWRGD, both turn off, and then turn
back on after 10 sec.
7. You can use the SHDN2 switch and SHDN push-button on
the isolation board (EVAL-ADM1075-ISOZ) to turn off
the hot swap.
8. If a latch event occurs (for example, a short circuit during
operation), the red LED, labeled LATCH, illuminates on
the isolation board (EVAL-ADM1075-ISOZ). The latch
event can be cleared with a CLEAR FAULT PMBus command
or by pressing the DELATCH push-button.
9. Disable the hot swap using the Hot Swap Control section
of the Basic Operation tab of the GUI. Disabling the hot
swap should turn off the green LEDs (D_PWRGD and
PWRGD) on both the mini evaluation board and the
isolation board.
10. Manually program the sense resistor value and the ADC
input resistor divider values (for example, RSENSE = 1.5 mΩ,
ADC top = 200 kΩ, ADC bottom = 2.8 kΩ). There is no
EEPROM available on the mini evaluation board (EVAL-
ADM1075MEBZ); therefore, these values must be
programmed each time the software GUI is opened.
11. Check that the voltage and current measurements are as
expected in the Power Monitor tab of the software GUI.

UG-548 EVAL-ADM1075MEBZ User Guide
Rev. A | Page 4 of 16
EVALUATION BOARD DESCRIPTION
The EVAL-ADM1075MEBZ is designed to demonstrate several
features of the ADM1075. It is used in conjunction with the
isolation board to provide a fully isolated solution. A simplified
drawing of the mini evaluation board and isolation board
combination is shown in Figure 2.
The mini evaluation board (EVAL-ADM1075MEBZ) is connected
to the isolation board (EVAL-ADM1075-ISOZ) using a Micro-
MaTch cable and is connected to a PC using a USB-SDP-CABLEZ
dongle for isolated I2C communication.
Figure 2. Basic Block Diagram
SDA_ISOSDA
GND_ ISO–48V
5V_ ISO5V
SCL_ISOSCL
ADM1075-ISOZ
ADM1075-MEBZ
PWRGD
UL_SPLYGD
LATCH
GPO2
PWRGD_ISO
SPLYGD_ISO
LATCH_ISO
GPO2_ISO
ADuM5404
ADuM1250
ISOLATION
BARRIER
5V 5V_ ISO
N-FET
ADM1075
RSENS
RLOAD CLOAD
RTNIN
–48VIN
–48VOUT
D1 R1
RV
R2
VIN
GATE
SENSEPSENSEN I2C
DIGITAL
PWRGD
RESTART
DELATCH SHDN SPARE
SHDN2
PWRGD
LATCH
ISO
UVL
11414-002

EVAL-ADM1075MEBZ User Guide UG-548
Rev. A | Page 5 of 16
EVAL-ADM1075MEBZ
The ADM1075 mini evaluation board (EVAL-ADM1075MEBZ)
is shown in Figure 3.
Thick wires should be used between the power supply and the
EVAL-ADM1075MEBZ board connector to minimize inductance.
The D_PWRGD LED illuminates green after the board is powered
and the ADM1075 GATE pin is high (FET fully enhanced).
Pressing the RESTART push-button triggers a shutdown that
lasts for 10 sec.
The board is intended to be plugged into a system where load
capacitance already exists. Two through-hole vias are provided
to allow the placement of a load capacitor on the board when
testing the board outside of a real system. All testing performed
on the board was done with a 330 F load capacitor.
The EVAL-ADM1075MEBZ uses a 470 nF timer capacitor to
maintain a 10 ms FET safe operating area. The undervoltage
and overvoltage thresholds were set using resistor dividers to
achieve the values shown in Table 1. A resistor divider was also
used on the ISET pin to set the current limit to approximately
15 A. The constant power level was set to the maximum allowable
level for the FET safe operating area to allow power-up in one
attempt. These values can all be fine-tuned further if necessary.
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.
Figure 3. EVAL-ADM1075MEBZ Board
Specifications
Table 1.
Parameter Min Typ Max Unit
Undervoltage Rising Threshold, VUVH −34.0 −35.0 −36.0 V
Undervoltage Falling Threshold, VUVL −30.6 −31.5 −32.4 V
Overvoltage Rising Threshold, VOVR −70.3 −72.4 −74.6 V
Overvoltage Falling Threshold, VOVF −68.9 −71.4 −74.0 V
Trip Current 12.1 12.75 13.4 A
Regulation Current 12.9 13.3 13.8 A
Constant Power Level 127 135 142 W
11414-003

UG-548 EVAL-ADM1075MEBZ User Guide
Rev. A | Page 6 of 16
EVAL-ADM1075-ISOZ
The ADM1075 isolation board (EVAL-ADM1075-ISOZ) includes
the following isolators:
The ADuM1250 is used to demonstrate the I2C isolation
and the digital signal.
The ADuM5404 provides quad-channel digital isolation
with isoPower®. When the isolated section is powered,
the isoPower device powers the 5 V components on the
primary side of the board.
The push-buttons and switch on the isolation board (EVAL-
ADM1075-ISOZ) allow the user to control the mini evaluation
board (EVAL-ADM1075MEBZ). The three on-board LEDs
provide users with a direct visual indication of IC power good,
latch event occurrence, and 5 V power supply from USB-SDP-
CABLEZ. The 8-way connector is used to connect the mini
evaluation board (EVAL-ADM1075MEBZ) to the isolation board
(EVAL-ADM1075-ISOZ), and the 10-way connector is used
with the USB-SDP-CABLEZ dongle to connect the isolation
board (EVAL-ADM1075-ISOZ) to a PC.
Figure 4. EVAL-ADM1075-ISOZ Board
11414-004

EVAL-ADM1075MEBZ User Guide UG-548
Rev. A | Page 7 of 16
EVALUATION BOARD HARDWARE
SWITCH, JUMPER, AND LED FUNCTIONS
EVAL-ADM1075MEBZ
Table 2. Connector Functions
Connector Description
RTNIN, −48VIN Hot swap line voltage inputs that also power the board components. The input voltage ranges from −30 V to −75 V.
−48VOUT Hot swap line voltage output.
J3 8-way connector; use a Micro-MaTch ribbon cable to connect to an EVAL-ADM1075-ISOZ isolation board.
Table 3. Switch Functions
Switch Description
RESTART Push-button switch to trigger a shutdown that lasts for 10 sec.
Table 4. LED Functions
LED Description
D_PWRGD PWRGD, active low; green.
Table 5. On-Board ICs
IC Description
U1 ADM1075 main IC.
Table 6. Retry Configuration
Bill of Materials Component
Retry Scheme R-7RTY R-1-10S R-7-10S
No Retries (Latch Off) Not populated Not populated Not populated
Seven Retries, Then Latch Off (Default) 0 Ω Not populated Not populated
One Retry Every 10 sec Not populated 0 Ω Not populated
Seven Retries Every 10 sec Not populated Not populated 0 Ω

UG-548 EVAL-ADM1075MEBZ User Guide
Rev. A | Page 8 of 16
EVAL-ADM1075-ISOZ
Table 7. Connector Functions
Connector Description
J1 8-way connector; use a Micro-MaTch ribbon cable to connect to an EVAL-ADM1075MEBZ board.
J2 10-way connector; use a USB-SDP-CABLEZ dongle to connect to a PC.
Table 8. Switch Functions
Switch Description
SHDN2 Toggle switch to shut down hot swap. Right = hot swap enabled; left = hot swap disabled.
SHDN Push-button switch to generate a shutdown. This push-button can be used to clear faults. Note that SHDN has a retry
counter capable of counting up to seven shutdown events. After seven shutdown events, GPO2 goes active low, and
then a restart or clear via a PMBus is required to enable the hot swap again.
DELATCH Push-button switch to clear a latch event after seven shutdown events.
SPARE Push-button switch connected to GPO1_TP.
Table 9. LED Functions
LED Description
PWRGD PWRGD, active low; green.
LATCH LATCH, active low; red.
ISO 5 V power supply from USB-SDP-CABLEZ, active high; blue.
Table 10. On-Board ICs
IC Description
U1 ADuM5404, quad-channel isolator with integrated dc-to-dc converter.
U2 ADuM1250 dual I2C isolator.

EVAL-ADM1075MEBZ User Guide UG-548
Rev. A | Page 9 of 16
TEST PLOTS
Figure 5. Power Up; Test Points Are as Follows: Channel 1 = VIN (Yellow),
Channel 2 = GATE (Pink), Channel 3 = VDS (Blue), Channel 4 =
System Current (Green), M1 = FET Power (CH2 × CH4) (Orange)
Figure 6. Power Up into 24 Ω Resistive Load; Test Points Are as Follows:
Channel 1 = VIN, Channel 2 = GATE, Channel 3 = VDS, Channel 4 = System Current
Figure 7. Power Up into a Fault Condition; Test Points Are as Follows:
Channel = VIN, Channel 2 = TIMER, Channel 3 = VDS, Channel 4 = System Current,
Math Channel = FET Power
Figure 8. Timer Cycle at Power-Up; Test Points Are as Follows: Channel 1 = VIN,
Channel 2 = TIMER, Channel 3 = VDS, Channel 4 = System Current
Figure 9. Short-Circuit Event; Test Points Are as Follows: Channel 1 = VIN,
Channel 2 = GATE, Channel 3 = VDS, Channel 4 = System Current,
Math Channel = FET Power
Figure 10. Short Circuit (Zoom); Test Points Are as Follows: Channel 1 = VIN,
Channel 2 = GATE, Channel 3 = VDS, Channel 4 = System Current
11414-005
11414-006
11414-007
11414-008
11414-009
11414-010

UG-548 EVAL-ADM1075MEBZ User Guide
Rev. A | Page 10 of 16
EVALUATION BOARD SCHEMATICS AND LAYOUT
EVAL-ADM1075MEBZ
Figure 11. EVAL-ADM1075MEBZ Schematic
11414-011
-48V IN
RTN IN
-48V OUT
Short/narrow trace between gnd planes
Thick track to -48V IN
Place testpoint holes each side of diode pads
DNI testpoints or silkscreen
Screw terminal - DNI
Place testpoint holes each side of cap pads
DNI testpoints or silkscreen
Place testpoint at right edge of board
Custom Kelvin Sense Footprint
2.54mm pitch between testpoints in rows
Make testpoint pitch wide enough for 30kW TVS
UV rising = 35V
UV falling = 31.5V
OV rising = 72.4V
OV falling = 72.1V
Circuit breaker typ = 12.75A
Current Regulation Typ = 13.3A
Cload max = 1000uF
DNI testpoints
Socket at right side of board outside testpoints
3-Pin screw terminal on left side of board
DNI testpoint
DNI testpoint
Notes:
2. Place caps close to DUT pins
1. Separate ground planes for VEE and -48V
(connected with short narrow trace)
3. Use custom sense resistor footprint (Rsense1/Rsense2)
Testpoint width ~1.5mm, pitch ~15mm
1
OV
2
PLIM
3
VCAP
4
ADC_V
5
ISET
6
SS
7
TIMER
8/LATCH 9ADR
10 /SHDN 11 /RESTART 12 GPO1 13 GPO2 14 SDAO
15 SDAI
16 SCL
17 /PWRGD
18 ADC_AUX
19 /SPLYGD
20 VEE
21 SENSEN
22
SENSEP
23
GATE
24
VEE_G
25
DRAIN
26
VIN
27
UVH
28
UVL
29 PADDLE
U1
ADM1075-LFCSP
CVCAP
1uF
CSS 10nF
CTIMER 470nF
R24
0R
R23 DNI
R25
200K
R27
100K
R30 2M
R16 DNI
RVIN1 15k
CVIN
1uF
CLOAD
DNI
D1
85V
SMCJ85A
COV
100nF
R26
2k8
R29 2K94
R17
100k
R18
1k
LOAD
20k
CUV 100nF
RVIN2 15k
RVIN3 15k
RVIN4 15k
RVIN5 15k
R1
10r
R2
10r
R3
10r
R4
10r
R5
10r
R6
10r
R13 0R
R-7RTY DNI
R-1-10S DNI
R-7-10S DNI
C+C-
D1+D1-
VIN
DRAIN
SOURCE
TP1TP2TP3TP4TP5TP6TP7
R28
0R
R8 0R R7 DNI R9 0R
R10 0R TP11
TP12
R14 100k
R15 100k
R11 0R
R12 DNI
J1-1
J1-2
J1-3
J2-1 J2-2 J2-3
SENSE1 SENSE2
RSENSE1 1.5m
SENSE1 SENSE2
RSENSE2
DNI
AK
D_PWRGD
LED
D2
BZT52C4V7
R22
100k
SENS+
SENS-
GATE
R31
20k
GG
D
D
S
S
Q3
RESTART
G
D
S
Q1
IPB072N15N3
G
D
S
Q2
IPB072N15N3
1 2 3 4 5 6 7 8
J3 8WAY-SOCKET-MICROMATCH
R32 DNI
R33
DNI
C1 DNI
D3 BAT54S
D4
BAT54A
R34
DNI
C2 DNI
R35
4k7
D5
MMSZ10T1G
D6
DNI
G
S
DQ4
IRLML2060TRPBF
ADC_AUX
-48V
-48V
-48V
-48V
VEE
VEE
VEE
VEE
VEE
VEE
VEE
VEE
VEE
VEE
SDA
VEE
GPO2
GPO1
/RESTART
/LATCH
VCAP
/SHDN
SDA
VCAP
PLIM
SCL
/PWRGD
/SPLYGD
PLIM
GPO2
/LATCH /SHDN
/RESTART
/SHDN /RESTART /PWRGD /SPLYGD /LATCH GPO1 GPO2 SCL SDA
SCL
/PWRGD
/SPLYGD
UVL
/LATCH
GPO1
/SHDN
GPO2
/PWRGD
VIN
VEE
VEE
VEE
RTNIN
VEE
UVL
VIN
VEE
-48V
GATE
GATE