|
|
PDF LTC4253A Data sheet ( Hoja de datos )
| Número de pieza | LTC4253A | |
| Descripción | -48V Hot Swap Controller | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC4253A (archivo pdf) en la parte inferior de esta página. Total 30 Páginas | ||
|
No Preview Available !
LTC4253/LTC4253A
–48V Hot Swap Controllers
with Sequencer
FEATURES
n Allows Safe Board Insertion and Removal from a
Live –48V Backplane
n Floating Topology Permits Very High Voltage
Operation
n Adjustable Analog Current Limit with Breaker Timer
Ideal for Two Battery Feeds
n Fast Response Time Limits Peak Fault Current
n Adjustable Undervoltage/Overvoltage Protection
with ±1% Threshold Accuracy (LTC4253A)
n Three Sequenced Power Good Outputs
n Adjustable Soft-Start Current Limit
n Adjustable Timer with Drain Voltage Accelerated
Response
n Latchoff After Fault
n Available in a 16-Pin SSOP Package
APPLICATIONS
n –48V Distributed Power Systems
n Negative Power Supply Control
n Central Office Switching
n High Availability Servers
n Disk Arrays
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and Hot
Swap is a trademark of Linear Technology Corporation. All other trademarks are the property of
their respective owners.
DESCRIPTION
The LTC®4253/LTC4253A negative voltage Hot Swap™
controllers allow a board to be safely inserted and removed
from a live backplane. Output current is controlled by three
stages of current-limiting: a timed circuit breaker, active
current limiting and a fast feedforward path that limits
peak current under worst-case catastrophic fault condi-
tions. The LTC4253/LTC4253A latch off after a circuit fault.
Adjustable undervoltage and overvoltage detectors dis-
connect the load whenever the input supply exceeds the
desired operating range. The LTC4253/LTC4253A’s supply
input is shunt-regulated, allowing safe operation with very
high supply voltages. A multifunction timer delays initial
start-up and controls the circuit breaker’s response time.
The circuit breaker’s response time can be accelerated
by sensing excessive MOSFET drain voltage, keeping the
MOSFET within its safe operating area (SOA). An adjustable
soft-start circuit controls MOSFET inrush current at start-up.
Three power good outputs are sequenced by an adjustable
timer and two ENABLE inputs to enable external power
modules at start-up or disable them if the circuit breaker
trips. The LTC4253A features tight ±1% undervoltage/
overvoltage threshold accuracy. The LTC4253/LTC4253A
are available in a 16-pin SSOP.
TYPICAL APPLICATION
– 48V/2.5A Hot Swap Controller
– 48V RTN
– 48V RTN
402k
1%
2.5k
1µF 15k(1/4W)/6 VIN
10nF
DIN††
DDZ13B*
EN2 EN3 VIN
LTC4253
RESET
5.6k
5.6k
32.4k
1%
– 48V A B3100*
B3100*
– 48V B
68nF
0.1µF
0.33µF
UV
OV
PWRGD1
PWRGD2
SS PWRGD3
SQTIMER
DRAIN
GATE
TIMER
SENSE
VEE
††
1M
IRF530S
10Ω
18nF
0.02Ω
+
100µF
5.6k
†
LOAD1
EN
LOAD2
EN
LOAD3
EN
4253 TA01
*DIODES, INC.
†MOC207
††RECOMMENDED FOR HARSH ENVIRONMENTS.
GATE
10V
SS
1V
SENSE
50mV
VOUT
50V
For more information www.linear.com/4253
Start-Up Behavior
1ms/DIV
4253 TA01b
425353aff
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC4253/LTC4253A
VZ vs Temperature
14.5 IIN = 2mA
14.0
13.5
13.0
12.5
12.0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G01
IEN vs VEN
180 IIN = 2mA
160 TA = 25°C
140
120
100
80
60
40
20
0
0 2 4 6 8 10 12 14 16
VEN (V)
4253 G04
Fast Current
Temperature
Limit
Voltage
VFCL
vs
300
280
260
240
220
200
180
160
140
120
100
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G07
IIN vs VIN
1000
100
TA = –40°C
TA = 85°C
TA = 25°C
TA = 125°C
10
1
0.1
0
5 10 15 20
VIN (V)
4253 G02
Circuit Breaker Current Limit
Voltage VCB vs Temperature
55
54
53
52
51
50
49
48
47
46
45–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G05
IGATE (Source) vs Temperature
60
UV/OV = 4V
58 TIMER = 0V
56
VSENSE = VEE
VGATE = 0V
54
52
50
48
46
44
42
40
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G08
For more information www.linear.com/4253
IIN vs Temperature
1000
950
VIN = VZ – 0.3V
900
850
800
750
700
650
600
550
500
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G03
Analog Current Limit Voltage
VACL vs Temperature
150
140
130
120
110
100
90
80
70
60
50–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G06
IGATE (ACL, Sink) vs Temperature
30
UV/OV = 4V
TIMER = 0V
25 VSENSE – VEE = 0.15V
VGATE = 3V
20
15
10
5
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
4253 G09
425353aff
5
5 Page 
BLOCK DIAGRAM
PWRGD1 3
VIN
50µA
VIN
4
VEE
EN2 1
PWRGD2 2
VEE
VIN 120µA
50µA
VEE
EN3 15
PWRGD3 16
VEE
VIN 120µA
50µA
VEE
VEE
SQTIMER
DELAY
SQTIMER
DELAY
OV 11
6.15V
(5.09V)
–
+
LTC4253/LTC4253A
– 4V
VIN
5µA
+
–
+ 0.33V VEE
–
VIN
+ 2.39V 8×
1×
VIN
50µA
1×
VEE
VEE –
6.15V
(5V)
1×
VIN
–+ 2.8V
+
14 SQTIMER
10 DRAIN
9 GATE
UV 12
–
–
TIMER 13
2.925V
(2.756V)
VIN VIN
200µA
5µA 4V
+
–
+
–
VEE
5µA
1V
VIN VEE
22µA
(28µA)
+
LOGIC
SS 6
95k
(47.5k)
RSS
5k
(2.5k)
VEE VEE
FOR COMPONENTS, CURRENTS AND VOLTAGES WITH TWO
VALUES, VALUES WITHOUT PARENTHESES REFER TO THE
LTC4253, VALUES WITH PARENTHESES REFER TO THE LTC4253A
58
RESET VEE
+ 0.5V
+
FCL
–
–+ 200mV
VEE
10mV –+
+
ACL
–
+
CB
–
–+ 50mV
VEE
For more information www.linear.com/4253
VEE
7 SENSE
4253 BD
425353aff
11
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet LTC4253A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4253 | -48V Hot Swap Controller |  Linear Technology |
| LTC4253A | -48V Hot Swap Controller | Linear |
| LTC4253A-ADJ | -48V Hot Swap Controller | Linear |
| LTC4253B | -48V Hot Swap Controller | Linear |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |