|
|
PDF LTC4368 Data sheet ( Hoja de datos )
| Número de pieza | LTC4368 | |
| Descripción | 100V UV/OV and Reverse Protection Controller | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC4368 (archivo pdf) en la parte inferior de esta página. Total 22 Páginas | ||
|
No Preview Available !
Features
nn Wide Operating Voltage Range: 2.5V to 60V
nn Overvoltage Protection to 100V
nn Reverse Supply Protection to –40V
nn Bidirectional Electronic Circuit Breaker:
nn +50mV Forward Sense Threshold
nn –50mV Reverse (LTC4368-1)
nn –3mV Reverse (LTC4368-2)
nn Adjustable ±1.5% Undervoltage and Overvoltage
Thresholds
nn Low Operating Current: 80µA
nn Low Shutdown Current: 5µA
nn Controls Back-to-Back N-Channel MOSFETs
nn Blocks 50Hz and 60Hz AC Power
nn Hot Swappable Supply Input
nn Pin-Selectable Overcurrent Auto-Retry Timer or Latchoff
nn 10-Pin MSOP and 3mm × 3mm DFN Packages
Applications
nn Reverse Battery Protection
nn Portable Instrumentation
nn Automotive and Industrial Surge Protection
nn Energy Storage Systems
LTC4368
100V UV/OV and Reverse
Protection Controller with
Bidirectional Circuit Breaker
Description
The LTC®4368 protects applications from power supply
voltages that may be too high, too low, or even negative
and from overcurrent faults in both forward and reverse
directions. The LTC4368 controls the gate voltage of a pair
of external N-channel MOSFETs to ensure that the load
is connected to the input supply only when there are no
voltage or current faults.
Two comparator inputs allow configuration of the over-
voltage (OV) and undervoltage (UV) set points using an
external resistive divider. A current sense resistor sets the
forward and reverse circuit breaker current thresholds.
After a forward current fault, the LTC4368 will either latch
off power, or retry after a user adjustable delay. After a
reverse current fault, the LTC4368 waits for the output to
fall 100mV below the input to reconnect power to the load.
The LTC4368 has a 32ms turn-on delay that debounces
live supply input connections and blocks 50Hz and 60Hz
AC power. UV/OV faults also trigger the 32ms recovery
delay before the external MOSFETs are turned back on.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT is a trademark of Linear Technology Corporation. All other trademarks are the property
of their respective owners.
Typical Application
24V Application with 10A Circuit Breaker
VIN –40V TO 100V SiR870
24V INRUSH
CONTROL
22k
SiR870
+50mV
0.005Ω
–3mV
VOUT
7V TO 36V
+
IOUT
–0.6A TO 10A
100µF
Load Protected from Reverse and Overvoltage at VIN
+70V
20V/DIV
OV = 36V
UV = 7V
VIN
OV = 36V
UV = 7V
3.3nF
464k
1500k
121k
VIN GATE
SENSE VOUT
SHDN
UV
LTC4368-2
FAULT
29.4k
OV
RETRY
GND
1200ms COOLDOWN
AFTER FORWARD
OC FAULT
0.22µF
VALID WINDOW
GND
VOUT
–40V
20V/DIV
VIN
200ms/DIV
VOUT
4368 TA01b
4368 TA01a
4368f
For more information www.linear.com/LTC4368
1
1 page  
LTC4368
E lectrical Characteristics The l denotes the specifications which apply over the full operating
tSeHmDpNe r=a t2u.r5eVr,aSnEgNeS, Eo t=h eVrOwUiTs e= sVpINecuinfilceastsioontshearrweiasteTsAp=ec2if5i°eCd.. VIN = 2.5V to 60V, unless otherwise noted (Note 2). UV = 2.5V, OV = 0V,
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX UNITS
UV, OV
VUV
VOV
VUVHYST
VOVHYST
UV Input Threshold Voltage
OV Input Threshold Voltage
UV Input Hysteresis
OV Input Hysteresis
UV Falling
OV Rising
l 492.5 500 507.5
l 492.5 500 507.5
l 20 25 32
l 20 25 32
mV
mV
mV
mV
ILEAK
tFAULT
UV, OV Leakage Current
UV, OV Fault Propagation Delay
V = 0.5V, VIN = 60V
Overdrive = 50mV, VIN = 12V
l ±10 nA
l
12
µs
SHDN
VSHDN
ISHDN
SHDN Input Threshold
SHDN Input Current
SHDN Falling
SHDN = 10V, VIN = 60V
l 0.4 0.75 1.2
l ±15
V
nA
tSTART
tSHDN(F)
tLOWPWR
Delay Coming Out of Shutdown Mode
SHDN To FAULT Asserted
Delay From Turn Off to Low Power
Operation
SHDN Rising to FAULT, VIN = 12V
VIN = 12V
VIN = 12V
l 400
l
l 20
800 1400
1.5 3
32 48
µs
µs
ms
FAULT
VOL
IFAULT
RETRY
FAULT Output Voltage Low
FAULT Leakage Current
IFAULT = 500µA, VIN = 12V
FAULT = 5V, VIN = 60V
l
0.15 0.4
V
l ±20 nA
VRETRY
IRETRY
tCLEAR
Configuration Threshold for GATE
Latch-Off
Output Current for RETRY Timer
Minimum SHDN Pulse to Clear Forward
Overcurrent RETRY Latch
RETRY Falling to ΔIRETRY > 2µA
VIN = 12V
RETRY = 2V, VIN = 12V
RETRY = 0V, VIN = 12V
RETRY = 0V, VIN = 12V
l 0.5 1 1.5
l 2.5 3.5 4.5
l –10 –17 –25
l 15
V
µA
µA
µs
tRETRY
Forward Overcurrent Cool-Down Delay FAULT Asserted to FAULT Released, CRETRY = 22nF l 80
SENSE = VOUT = VIN = 12V
120 150
ms
Note 1. Stresses beyond those listed under Absolute Maximum Ratings
Note 2. All currents into pins are positive; all voltages are referenced to
may cause permanent damage to the device. Exposure to any Absolute
GND unless otherwise noted.
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 3. These pins can be tied to voltages below –0.3V through a resistor
that limits the current below 1mA.
For more information www.linear.com/LTC4368
4368f
5
5 Page 
Applications Information
M1 M2 +50mV
VIN PSMN4R8-100BSE SiR662 0.004Ω
24V INRUSH
CONTROL
–3mV
22k
OV = 36V
UV = 7V
2.2nF
R4
464k
R3
1500k
R2
121k
R1
29.4k
VIN GATE
SENSE VOUT
SHDN
UV
LTC4368-2
FAULT
OV
GND
RETRY
VOUT
7V TO 36V
–0.75A TO 12.5A
1200ms COOLDOWN
AFTER FORWARD
OC FAULT
0.22µF
4368 F02
LTC4368
Figure 2. LTC4368-2 Protects Load from Voltage (–40V to 100V) and Current (–0.75A to 12.5A) Faults
The LTC4368 is an N-channel MOSFET controller that
protects a load from overvoltage faults (both positive and
negative) and from overcurrent faults (both forward and
reverse). A typical application circuit using the LTC4368-2
is shown in Figure 2. The circuit provides a low loss con-
nection from VIN to VOUT as long as there are no voltage
or current faults.
Voltages at VIN outside of the 7V to 36V range are prevented
from getting to the load and can be as high as 100V and
as negative as –40V. Load currents (including inrush
currents) above 12.5A (forward from VIN to VOUT) and
below –0.75A (reverse from VOUT to VIN) will cause the
load to be disconnected from VIN. The circuit of Figure 2
protects against negative voltages at VIN as shown. Note
that the SOA and voltage requirements are not the same
for the two external MOSFETs. During power-up, the input
MOSFET (M1) will stand off more voltage (up to VIN) than
the output MOSFET (M2). The body diode of M2 will limit
its drain to source voltage. This allows the use of smaller
MOSFETs at the output.
During normal operation, the LTC4368 provides up to
13.1V of gate enhancement to the external back-to-back
N-channel MOSFETs. This turns on the MOSFETs, thus
connecting the load at VOUT to the supply at VIN.
GATE Drive
The LTC4368 turns on the external N-channel MOSFETs by
driving the GATE pin above VOUT. The voltage difference
between the GATE and VOUT pins (gate drive) is a function
of VIN and VOUT.
Figure 3 highlights the dependence of the gate drive on VIN
and VOUT. When system power is first turned on (SHDN low
to high, SENSE = VOUT = 0V), gate drive is at a maximum
for all values of VIN. This helps prevent startup problems
into heavy loads by ensuring that there is enough gate
drive to support the load.
14
12
VIN = 12V, 60V
10
TA = 25°C
IGATE = –1µA
8 VIN = 5V
6
VIN = 3.3V
4
VIN = 2.5V
2
0
0 5 10 15
VOUT (V)
4365 F03
Figure 3. Gate Drive (GATE – VOUT) vs VOUT
For more information www.linear.com/LTC4368
4368f
11
11 Page | ||
| Páginas | Total 22 Páginas | |
| PDF Descargar | [ Datasheet LTC4368.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC4360-1 | Overvoltage Protection Controller | Linear Technology |
| LTC4360-2 | Overvoltage Protection Controller | Linear Technology |
| LTC4361-1 | Overvoltage/Overcurrent Protection Controller | Linear Technology |
| LTC4361-2 | Overvoltage/Overcurrent Protection Controller | Linear Technology |
| 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 |