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Número de pieza | SC4250 | |
Descripción | Negative Voltage / Hot Swap Controller | |
Fabricantes | Semtech | |
Logotipo | ||
Hay una vista previa y un enlace de descarga de SC4250 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
No Preview Available ! POWER MANAGEMENT
Description
The SC4250 is a negative voltage hotswap controller
that allows the insertion of line cards into a live backplane.
The inrush current is programmable, and the closed loop
operation limits the maximum current even under short
circuit conditions. A built-in timing circuit prevents false
shutdown. The signal from the drain voltage is fed to the
timer, providing safety for the MOSFET when in linear
mode. The SC4250 latches off under abnormal condi-
tions The power has to be recycled in order to resume
operation.
The device comes in two options, PWRGD (SC4250H)
and PWRGD (SC4250L). These high or low signals can
be directly used to enable power modules.
SC4250
Negative Voltage
Hot Swap Controller
Features
Programmable slew of the inrush current when
used for hot insertion in the negative 24V and 48V
backplane
Closed loop operation limits the maximum current
even in short circuit condition
Built in timer prevents false shutdown when the
closed loop operation limits the current
Sensing the drain voltage allows for immediate
shutdown in short circuit conditions where current
spikes and noise are ignored
Power good signal
Input UVLO and OVLO sensing
Circuit breaker and retry
SO-8 package
Applications
Central office switching
-48V Distributed power systems
Power supply hotswap & inrush control
Typical Application Circuit
GND
PWRGD/PWRGD
GND(remote)
R1
562k
R2
9.31k
R3
10.2k
-- 48V
Revision: April 6, 2005
U1
SC4250
1 PWRGD /PWRGD
VCC 8
2 OV
DRAIN
7
3 UV
GATE
6
4 VEE
SENSE
5
C1
0.1
VVeEeE
R6 C4
18k 3.3nF
C2
0.001
R4
0.01
C3
0.33
R5
10
Q1
Figure 1
1
C5
150
www.semtech.com
1 page POWER MANAGEMENT
Block Diagrams
Active High PWRGD
Vcc
12.5V Reg
UV _
+
_
OV
+
60mV
_
+
Vee SENSE
Active Low PWRGD
Vcc
12.5V Reg
UV _
+
_
OV
+
60mV
_
+
Vee SENSE
2005 Semtech Corp.
SC4250
1.223V
50uA
PWRGD
_ +7V
+
Delay
_+
1.75V
GATE
DRAIN
1.223V
50uA
PWRGD
_ +7V
+
Delay
GATE
5
DRAIN
_+
1.75V
www.semtech.com
5 Page POWER MANAGEMENT
Evaluation Board - Bill of Materials
Ref Qty
Designator
Value
1 1 C1
2 1 C2 (opt.)
3 1 C3
4 1 C4
0.1/100V
0.01
0.33
0.0033/100V
5 1 C5
6 1 C6 (opt.)
7 1 Q1
8 1 R1
9 1 R2
10 1 R3
11 1 R4
12 1 R5
13 1 R6
14 1 R7
15 1 U1
150/80V
0.1/100V
IRF1310
562k
9.31k
10.2k
0.01
10
18k
5.1k
SC4250
SC4250
Description
Ceramic cap
Ceramic cap
Ceramic cap
Ceramic cap
Aluminum cap
Ceramic cap
MOSFET
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Resistor
Semtech IC
Footprint
1210
0805
1206S
0805
CAP-AL-H
1210
D2PAK
0805
0805
0805
2010CS
0805
0805
1206S
SO-8
2005 Semtech Corp.
11
www.semtech.com
11 Page |
Páginas | Total 12 Páginas | |
PDF Descargar | [ Datasheet SC4250.PDF ] |
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