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ADM1070 데이터시트 PDF




Analog Devices에서 제조한 전자 부품 ADM1070은 전자 산업 및 응용 분야에서
광범위하게 사용되는 반도체 소자입니다.


PDF 형식의 ADM1070 자료 제공

부품번호 ADM1070 기능
기능 -48 V Hot Swap Controller
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ADM1070 데이터시트 를 다운로드하여 반도체의 전기적 특성과 매개변수에 대해 알아보세요.




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ADM1070 데이터시트, 핀배열, 회로
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




ADM1070 pdf, 반도체, 판매, 대치품
ADM1070
PIN CONFIGURATION
SENSE 1
6 GATE
ADM1070ART
VEE 2
TOP VIEW
5 UV/OV
(Not to Scale)
VIN 3
4 TIMER
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Pin No.
1
2
3
4
5
6
Mnemonic
SENSE
VEE
VIN
TIMER
UV/OV
GATE
PIN FUNCTION DESCRIPTION
Function
Connection to External FET Source Voltage. A sense resistor is connected in the supply path
between the SENSE Pin and VEE, and the voltage across this resistor is monitored to detect current
faults. This voltage is fed as an input to the linear current regulator. When it reaches 100 mV for
a specified period, tON, the regulator reduces the gate voltage and drives the FET as a linear pass
device. If current monitoring is not required, this feature can be turned off by shorting the
SENSE Pin and VEE together.
Device Negative Supply Voltage. This pin should be connected to the lower potential of the
power supply.
Shunt Regulated On-Chip Supply, Nominally VEE + 12.3 V. This pin should be current fed
through a dropper resistor that is connected to the higher potential of the power supply inputs.
Allows User Control over Timing Functions by Determining Frequency of Oscillator. Fre-
quency set by connecting external capacitor to VEE. Tying pin directly to VEE causes oscillator to
default to internally set value.
Input Pin for Overvoltage and Undervoltage Detection Circuitry. The voltage appearing on the
UV/OV Pin is proportional to board supply and is determined by external resistors. When the
voltage on UV/OV falls below the undervoltage threshold of 0.86 V, the GATE Pin is driven low.
When the voltage appearing at the UV/OV Pin rises above the overvoltage threshold of 1.97 V,
the GATE Pin is also driven low. If the external resistor ratio of R1/R2 = 40 is used, then this
gives an operating range of –36 V to –77 V.
Output to External FET Gate Drive. Controlled by linear current regulator. The gate is driven
low if an overvoltage or undervoltage fault occurs or if a current fault lasts for longer than the
time, tON. When in linear regulation, the GATE Pin voltage is controlled as part of the servo loop.
No external compensation is required. When the FET is fully enhanced and the load capacitance
has been charged, the GATE Pin reaches a high level of typically 12 V.
–4– REV. 0

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ADM1070 전자부품, 판매, 대치품
50
45
40
35
30
25
20
15
10
5
0
0 1 2 3 4 5 6 7 8 9 10 11 12
VGATE – V
TPC 13. IGATE vs. VGATE
4.0
HIGH
3.5
3.0
2.5
2.0
1.5
LOW
1.0
0.5
0
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE – ؇C
TPC 14. High and Low Timer Thresholds vs. Temperature
1.00
0.95
UV HIGH
0.90
0.85 UV LOW
0.80
0.75
–50 –35 –20 –5 10 25 40 55 70
TEMPERATURE – ؇C
TPC 15. UV Threshold vs. Temperature
85
ADM1070
www.DataSheet4U.com
2.05
2.00
OV HIGH
1.95
OV LOW
1.90
1.85
1.80
–50 –35 –20 –5 10 25 40 55 70
TEMPERATURE – ؇C
TPC 16. OV Threshold vs. Temperature
85
10
9
8
7
6
5
4
3
2
1
0
–50 –35 –20 –5 10 25 40 55 70 85
TEMPERATURE – ؇C
TPC 17. ISENSE vs. Temperature (VSENSE = 50 mV)
–60
–40
–20
–2.0 –1.6 –1.2 –0.8 –0.4
0
0
0.4 0.8 1.2 1.6 2.0
20
40
60
80
100
120
VSENSE – VEE
TPC 18. ISENSE vs. (VSENSE – VEE)
REV. 0
–7–

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