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ADM1014 Folha de dados(PDF) 10 Page - Analog Devices

Nome de Peças ADM1014
Descrição Electrónicos  Dual PCI Hot-PlugTM Controller
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Fabricante Electrônico  AD [Analog Devices]
Página de início  http://www.analog.com
Logo AD - Analog Devices

ADM1014 Folha de dados(HTML) 10 Page - Analog Devices

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ADM1014
–10–
REV.
PrN 1/02
Figure 3. Typical Application Circuit
the capacitor on 12VG, the +3.3VAUX, 3.3V and 5V outputs
may not have exceeded their undervoltage thresholds by the
time the undervoltage comparators are enabled, and a false
undervoltage condition may be detected. For this reason it is
recommended to use the same value for all three gate capaci-
tors.
For PCI applications the minimum recommended value is
0.033µF. Smaller values may cause overcurrent faults at power-
up due to excessive charging currents drawn by decoupling
capacitors.
The maximum value of the gate capacitors is determined by the
need to discharge them quickly when turning off the outputs
under fault conditions. If the capacitors are too large the
ADM1014 may be unable to protect the power bus or the ex-
ternal MOSFETs. With 0.033µF capacitors, the turn-off time
will be less than 6µs.
APPLICATIONS INFORMATION
APPLICATION CIRCUIT
Figure 3 shows a typical circuit configuration for the ADM1014 in
a PCI application, controlling supply voltages of +3.3V at up to
7.6A, +5V at up to 5A, +12V at up to 0.5A and –12V at up to
0.1A. In this circuit, two external MOSFETs are connected in
parallel for the 3.3V and 5V outputs to minimise on-resistance.
OCSET GND
R5
C11
C12
M12VOB
M12GB
PWRONA
M12VINA
12VOB
12VINA
3VISENA
3VSA
3V5VGA
3VISENB
3VSB
3V5VGB
12VINB
M12VINB
5VSB
5VISENB
M12VOA
M12GA
12VGA
12VOA
5VSA
5VISENA
ADM1014
C2
C3
C4
C5
R1
R2
R3
R4
Q1
Q2
Q3
Q4
TO SYSTEM CONTROLLER
SLOT 2
5V
3.3V
C7
C8
SLOT 1
-12V
12V
AUXINA
AUXOA
AUXGA
C1
+3.3Vaux
3.3V
5V
-12V
12V
AUXINB
AUXOB
AUXGB
C6
+3.3Vaux
FLTNA
C10
12VGB
PWRONB
PAUXONA
PAUXONB
FAUXA
FLTNB
FAUXB
FROM
SYSTEM
CONTROLLER
R11
R12
C9


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