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ADM1073 Schematic ( PDF Datasheet ) - Analog Devices

Teilenummer ADM1073
Beschreibung Full-Feature 48 V Hot Swap Controller
Hersteller Analog Devices
Logo Analog Devices Logo 




Gesamt 25 Seiten
ADM1073 Datasheet, Funktion
Data Sheet
Full-Feature −48 V Hot Swap Controller
ADM1073
FEATURES
Precision inrush linear current limit
Soft start inrush current limit profiling
Precision maximum on-time in current limit
Maximum on-time modulated by FET drain voltage for
additional SOA protection
Adjustable PWM retry scheme and multiple device cascading
capability for charging large capacitive loads
Limited number of PWM cycles for FET SOA protection under
short circuit condition
Ability to configure device as continuous autoretry with a
5-second cooling period
Shunt regulator topology to allow very large transient input
supplies
Separate UV and OV pins for programming allowable input
supply window
Programmable OV hysteresis using current source into pin
when supply is high
Programmable UV hysteresis using current sink from pin
when supply is low
PWRGD output indicates when capacitor charging complete
SPLYGD output indicates when supply is within
valid window
LATCHED output indicates the end of the retry cycle before
load capacitance is charged
SHDN input for user-commanded shutdown
RESTART input for user-triggered 5-second shutdown and
autorestart— virtual card reseat
FUNCTIONAL BLOCK DIAGRAM
OV
UV
SS
TIMER
VIN
VCC AND
REFERENCE
GENERATOR
OVERVOLTAGE
DETECTOR
UNDERVOLTAGE
DETECTOR
SOFT START
CONTROL
tON CONTROL
5 SECOND
SHUTDOWN
SPLYGD
FOLDBACK
AND PWRGD
PWRGD
DRAIN
VIN
100mV(MAX)
50A
GATE
FAULT TIMER
AND CONTROL
OSCILLATOR PWM
TIMEOUT
SENSE
VEE
SHDN
RESTART
LATCHED
Figure 1.
APPLICATIONS
Central office switching
Telecommunication and data communication equipment
−48 V distributed power systems
Negative power supply control
High availability servers
−48 V power supply modules
Disk arrays
GENERAL DESCRIPTION
The ADM1073 is a full-feature, negative voltage, hot swap
controller that allows boards to be safely inserted and removed
from a live −48 V backplane. The part provides precise and
robust current limiting, and protection against both transient
and nontransient short circuits in overvoltage and undervoltage
conditions. The ADM1073 can operate from a negative voltage
of −18 V to −80 V and can tolerate transient voltages of up to
−200 V.
Inrush current is limited to a programmable value by control-
ling the gate drive of an external N-channel FET. The maximum
current limit is set by the choice of the sense resistor, RSENSE.
A built-in soft start function allows control of the inrush
current profile by an external capacitor on the soft start (SS)
pin.
An external capacitor on the TIMER pin determines the time
for which the FET gate is controlled to be high when maximum
inrush current flows. The ADM1073 employs a limited consec-
utive retry scheme, whereby, if the load capacitance is not fully
charged within one attempt, the FET gate is pulled low and
retries after a cooling period.
(continued on Page 3)
Rev. B
Document Feedback
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.
Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700 ©2004–2013 Analog Devices, Inc. All rights reserved.
Technical Support
www.analog.com






ADM1073 Datasheet, Funktion
Data Sheet
Parameter
DRAIN (FOLDBACK) AND PWRGD
DRAIN Voltage at Which PWRGD Asserts
Maximum DRAIN Pin Current Allowable, IDRAIN(MAX)
PWRGD Output Voltage Low
PWRGD Internal Pull-Up Current
PWRGD Output Voltage High
RESTART
Time before Restart
Input Threshold
Glitch Filter
Internal Pull-Up Current
SHDN
Glitch Filter
Input Threshold
Internal Pull-Up Current
LATCHED AND SPLYGD
Output Voltage Low
Internal Pull-Up Current
Output Voltage High
ADM1073
Min Typ Max Unit
1.9 2 2.1
36
12
0.2 0.4
6
VIN
V
µA
V
V
µA
V
5
1.35 1.45 1.55
5
6
s
V
µs
µA
5
1.35 1.45 1.55
6
µs
V
µA
12
0.2 0.4
6
VIN
V
V
µA
V
Test Conditions
RDRAIN = 3.75 M to 20 M
VDS = 80 V; RDRAIN = 3.25 M
IPWRGD = 2.5 mA
IPWRGD = 0.5 mA
ILATCHED, ISPLYGD = 2.5 mA
ILATCHED, ISPLYGD = 0.5 mA
Rev. B | Page 5 of 24

6 Page









ADM1073 pdf, datenblatt
Data Sheet
120
115
110 VFCL
105
100
VACL
95
90
VCB
85
80
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE (°C)
Figure 21. Voltage Limits for Load Current Control vs. Temperature
3.0
2.5 VTMR (HIGH)
2.0
1.5
1.0
VTMR (LOW)
0.5
0
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE (°C)
Figure 22. High and Low TIMER Thresholds vs. Temperature
20
18
16
14
12
10
8
6
4
2
0
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE (°C)
Figure 23. Maximum Current Limit On-Time vs. Temperature
(IDRAIN = 4 µA, CTIMER = 47 nF)
ADM1073
14
12
10
47.0nF
8
33.0nF
6
1.0nF 22.0nF
4
82.0nF
68.0nF
100.0nF
2 10.0nF
4.7nF
0
0 10 20 30 40 50 60 70 80 90 100
CTIMER (nF)
Figure 24. Current Limit On-Time vs. CTIMER (1 nF − 100 nF)
10
9
8
7
6
5
4
3
2
1
0
–50 –35 –20 –5 10 25 40 55 70
TEMPERATURE (°C)
Figure 25. Current Limit PWM vs. Temperature
85
50
45
40
35
30
25
20
15
10
5
0
0 1 2 3 4 5 6 7 8 9 10
RTIMER (M)
Figure 26. Current Limit PWM vs. RTIMER
Rev. B | Page 11 of 24

12 Page





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