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PDF ADM1070 Data sheet ( Hoja de datos )
| Número de pieza | ADM1070 | |
| Descripción | -48 V Hot Swap Controller | |
| Fabricantes | Analog Devices | |
| Logotipo |  |
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a
FEATURES
Allows Safe Board Insertion and Removal from a Live
–48 V Backplane
Typically Operates from –36 V to –80 V
Tolerates Transients up to –200 V (Limited by External
Components)
Accurate Programmable Linear Current Limit for
In-Rush Control and Short Circuit Protection
Programmable Timeout in Current Limit
Limited Consecutive Retry:
Auto-Restart after Current Limit Timeout
Shutdown after Seven Consecutive Auto Restarts
Provides Immunity from Step Induced Current Spikes
Default Timing Provided with no TIMER Capacitor
Single Pin Undervoltage/Overvoltage Detection
Programmable Operating Voltage Window
Programmable Undervoltage/Overvoltage Time Filter
Small 6-Lead SOT-23 Package
APPLICATIONS
Central Office Switching
–48 V Distributed Power Systems
Negative Power Supply Control
Hot Board Insertion
Electronic Circuit Breaker
High Availability Servers
Programmable Current Limiting Circuit
–48 V Power Supply Modules
www.DataSheet4U.com
–48 V Hot Swap Controller
ADM1070
FUNCTIONAL BLOCK DIAGRAM
0V
VDD
RDROP
16k⍀
VIN
CLOAD
VOUT
R1
VCC AND
VCC
REFERENCE
12V GENERATOR VREF
UV/OV
R2
TIMER
( )*
–48V
VEE
OVER-UNDER
VOLTAGE DETECTION
CIRCUIT
FAULT TIMER AND
CONTROL
100mV
EN
VIN
45A
GATE
Q1
OSCILLATOR
ADM1070
SENSE
RSENSE
VEE
*OPTIONAL TIMER CAPACITOR
GENERAL DESCRIPTION
The ADM1070 is a negative voltage hot swap controller that
allows a board to be safely inserted and removed from a live
–48 V backplane. The part achieves this by providing robust
current limiting, protection against transient and nontransient
short circuits and overvoltage and undervoltage conditions. The
ADM1070 typically operates from a negative voltage of up to
–80 V and can tolerate transient voltages of up to –200 V.
In-rush current is limited to a programmable value by control-
ling the gate drive of an external N-channel FET. The current
limit can be controlled by the choice of the sense resistor,
RSENSE. Added control of the in-rush current is provided by an
on-chip timer that uses pulsewidth modulation to allow the
maximum current to flow for only 3% of the time. An autorestart
occurs after a current limit timeout. After seven successive
autorestarts, the fault will be latched and the part goes into
shutdown with the result that the external FET is disabled until
the power is reset.
REV. 0
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. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
The ADM1070 also features single-pin undervoltage and over-
voltage detection. The FET is turned off if a nontransient
voltage less than the undervoltage threshold, typically –36 V, or
greater than the overvoltage threshold, typically –77 V, is detected
on the UV/OV Pin. The operating voltage window of the
ADM1070 is programmable and is determined by the ratio R1/R2.
Time filtering on the undervoltage and overvoltage detection
and current limiting is programmable via the TIMER Pin. An
external capacitor connected between the TIMER Pin and VEE
determines the undervoltage/overvoltage time filter and the
timeout in current limit. If the pin is tied to VEE, the time filter
values and the current limit timeout revert to default figures.
The ADM1070 is fabricated using BiCMOS technology for mini-
mal power consumption. The part is available in a small
6-Lead SOT-23 package.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
1 page  
Typical Performance Characteristics–ADM1070
www.DataSheet4U.com
2.0 14.5
1.8
14.0
1.6
1.4 13.5
1.2 13.0
1.0
12.5
0.8
0.6 12.0
0.4
11.5
0.2
0
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE – ؇C
11.0
–45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85
TEMPERATURE – ؇C
TPC 1. IIN vs. Temperature
TPC 4. VZ vs. Temperature
1000
100
10
1
0.1
0
+85؇C
+25؇C
–40؇C
2 4 6 8 10 12 14 16
VIN – V
TPC 2. IIN vs. VIN
10
9
8
7
6
5
4
3
2
–45 –35 –25 –15 –5 5 15 25 35 45 55 65 75 85
TEMPERATURE – ؇C
TPC 3. RZ vs. Temperature
12
11
10
9
8
7
6
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE – ؇C
TPC 5. Undervoltage Lockout, VLKO vs. Temperature
100
95
90 RISING
85
80
FALLING
75
70
65
60
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE – ؇C
TPC 6. Circuit Breaker Current Limit Voltage,
VCB vs. Temperature
REV. 0
–5–
5 Page 
UNDERVOLTAGE/OVERVOLTAGE DETECTION
The ADM1070 incorporates single-pin overvoltage and
undervoltage detection with a programmable operating voltage
window. When the voltage on the UV/OV pin rises above the
OV rising threshold or falls below the UV falling threshold, a
fault signal is generated that disables the linear current regulator
and results in the GATE Pin being pulled low. The voltage fault
signal is time filtered so that faults of duration less than the UV/
OV glitch filter time, tFLT, do not force the gate drive low (tFLT
is set by the choice of external capacitor CT, see Table III). The
filter operates only on the “faulting” edge (i.e., on a high to
low transition on the undervoltage monitor and on a low to
high transition on the overvoltage monitor). The analog com-
parators have some hysteresis to provide smooth switching of
the comparator inputs.
If the voltage on UV/OV goes out of range (i.e., below 0.86 V
or above 1.97 V) gate is pulled low. If the UV/OV voltage
subsequently re-enters the operating voltage window, the
ADM1070 will restore the gate drive.
The overvoltage and undervoltage thresholds are:
UV turning on = 0.91 V
UV turning off = 0.86 V
OV turning on = 1.97 V
OV turning off = 1.93 V
The undervoltage/overvoltage levels are determined by selection
of the resistor ratio R1/R2, (see Table I). These two resistors
form a resistor divider that generates the voltage; at the UV/OV
Pin, which is proportional to the supply voltage. By choosing
this ratio carefully, the ADM1070 can be programmed to apply
the supply voltage to the load only when it is within specific
thresholds. For example, for R1 = 39 kΩ and R2 = 1 kΩ the
typical operating range is 36.4 V to 76.8 V. The undervoltage
and overvoltage shutdown thresholds are 34.4 V and 77.2 V
for this resistor ratio. 1% resistors should be used to maintain
the accuracy of these threshold levels.
Voltage Divider:
VUV/OV = VSS(R2/(R1 + R2))
For R2 = 1 kΩ:
VSS = VUV/OV(R1 + 1)
And for R1 = 39 kΩ:
VSS = 40 VUV/OV
Operating Range:
UV => 40(0.91) = 36.4 V
OV => 40(1.93) = 77.2 V
ADM1070
www.DataSheet4U.com
+
R1
VSS +
R2 VUV/OV
––
Figure 3. Voltage Divider
UV/OV Shutdown Levels:
UV => 40(0.86) = 34.4 V
OV => 40(1.97) = 78.8 V
120
100
80
60
40
20
0
30 33 36 39 43 47
R1 – k⍀ (FOR R2 = 1k⍀)
51
Figure 4. Operating Voltage Window vs. Resistance Ratio
Resistor Ratio
R1 (for R2 = 1 k⍀)
k⍀
30
33
36
39
43
47
51
Table IV. Resistance Ratios and Operating Voltage Windows
Undervoltage
Overvoltage
VUV (Falling)
V
26.7
29.2
31.8
34.4
37.8
41.3
44.7
VUV (Rising)
V
28.2
31.0
33.7
36.4
40.0
43.7
46.4
VOV (Falling)
V
59.8
65.6
71.4
77.2
84.9
92.6
100.4
VOV (Rising)
V
61.0
67.0
72.9
78.8
86.7
94.6
102.4
REV. 0
–11–
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet ADM1070.PDF ] | |
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