|
|
PDF LTC1696 Data sheet ( Hoja de datos )
| Número de pieza | LTC1696 | |
| Descripción | Overvoltage Protection Controller | |
| Fabricantes | Linear | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de LTC1696 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
|
No Preview Available !
FEATURES
nn ±2% Overvoltage Threshold Accuracy
nn Low Profile (1mm) ThinSOT™ Package
nn Gate Drive for SCR Crowbar or External N-Channel
Disconnect MOSFET
nn Monitors Two Output Voltages
nn Senses Output Voltages from 0.8V to 24V
nn Wide Supply Range: 2.7V to 27V
nn Multifunction TIMER/RESET Pin
APPLICATIONS
nn Telecommunication Systems
nn Computer Systems
nn Industrial Control Systems
nn Notebook Computers
LTC1696
Overvoltage Protection
Controller
DESCRIPTION
The LTC®1696 is a standalone power supply overvolt-
age monitor and protection device designed to protect a
power supply load in the event of an overvoltage fault. It
monitors two adjustable output voltages. If an overvoltage
condition is detected, the output drives either an external
SCR crowbar or turns off external back-to-back N-channel
MOSFETs, thereby, disconnecting the input voltage from
the power supply.
Pin 6 offers three functions. By connecting a capacitor
to this pin, the internal glitch filter time delay can be
programmed. Without the capacitor, the default time
delay is determined by an internal capacitor. This pin also
serves as a reset input to clear the internal latch after an
overvoltage fault condition. By pulling it high, the OUT
pin is activated if the FB1 and FB2 voltages remain below
the trip threshold.
The LTC1696 is available in the low profile (1mm)
ThinSOT package.
L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. ThinSOT is a trademark of Linear Technology Corporation.All other
trademarks are the property of their respective owners. .
TYPICAL APPLICATION
SCR Crowbar
VCC
12V
POWER
SUPPLY
R2
137k
1%
R1
44.2k
1%
1 FB1
TIMER/ 6
RESET
LTC1696
2 GND
FB2 5
C1
1nF
SCR
2N6507
3 VCC
C2
0.1µF
OUT 4
1696 TA01
VOUT2
5V
VOUT1
3.3V
R4
232k
1%
Q1
2N7002
R3
44.2k
1%
RESET
Overvoltage Response
FB1
0.5V/DIV
TIMER/RESET
2V/DIV
IOUT
20mA/DIV
C1 = 1nF
100µs/DIV 1696 TA02
For more information www.linear.com/LTC1696
1696fb
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1696
TIMER Current vs Temperature
22 VCC = 12V
20
18
FB1 + FB2 OVERDRIVE 200mV
16
14 FB1 OR FB2 OVERDRIVE 200mV
12
10
8
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1696 G10
Glitch Filter Timer
vs Feedback Overdrive
25 VCC = 3.3V
TA = 25°C
20
15
FB1 OR FB2 OVERDRIVE
10
FB1 AND FB2 OVERDRIVE
5
0
0 50 100 150 200 250
FEEDBACK OVERDRIVE (mV)
1696 G13
External Trigger Threshold
Voltage vs Temperature
1.505 VCC = 12V
1.5
1.495
1.49
1.485
1.48
1.475
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1696 G16
TIMER Current
vs Feedback Overdrive
20 VCC = 12V
TA = 25°C
16
FB1 AND FB2 OVERDRIVE
12 FB1 OR FB2 OVERDRIVE
8
4
0
0 50 100 150 200 250
FEEDBACK OVERDRIVE (mV)
1696 G11
Glitch Filter Timer
vs Feedback Overdrive
30 VCC = 12V
TA = 25°C
25
20
15
10 FB1 OR FB2 OVERDRIVE
5 FB1 AND FB2 OVERDRIVE
0
0 50 100 150 200 250
FEEDBACK OVERDRIVE (mV)
1696 G14
RESET Threshold Voltage
vs Supply Voltage
0.868 TA = 25°C
0.866
0.864
0.862
0.860
0.858
0.856
0.854
0.852
0
5 10 15 20 25
SUPPLY VOLTAGE (V)
30
1696 G17
For more information www.linear.com/LTC1696
TIMER Current
vs Feedback Overdrive
16 VCC = 3.3V
TA = 25°C
14
FB1 AND FB2 OVERDRIVE
12
FB1 OR FB2 OVERDRIVE
10
8
6
4
0 50 100 150 200 250
FEEDBACK OVERDRIVE (mV)
1696 G12
External Trigger Threshold
Voltage vs Supply Voltage
1.51
TA = 25°C
1.50
1.49
1.48
1.47
1.46
1.45
1.44
0
5 10 15 20 25
SUPPLY VOLTAGE (V)
30
1696 G15
RESET Threshold Voltage
vs Temperature
0.88 VCC = 12V
0.875
0.87
0.865
0.86
0.855
0.85
0.845
0.84
–50 –25
0 25 50 75 100 125 150
TEMPERATURE (°C)
1696 G18
1696fb
5
5 Page 
LTC1696
APPLICATIONS INFORMATION
Back-to-Back N-Channel MOSFET
A power management circuit that uses the LTC1696 to
control external back-to-back N-channel MOSFET at low
supply voltage is shown in Figure 3. In standby mode, the
drain of the external N-channel MOSFET, Q1, is pulled high
by the power management controller when the LTC1696
OUT pin is in the low state. The LTC1696 drives the gate
of Q1 high during an overvoltage fault condition. This
pulls the drain of Q1 low and turns off the back-to-back
N-channel MOSFETs.
R2
38.3k
1%
1.5V
R1
44.2k
1%
1 FB1
TIMER/ 6
RESET
LTC1696
2 GND
FB2 5
VCC
3.3V
3 VCC
C2
OUT 4
0.1µF
C1 Q2
1nF 2N7002
R3 R4
44.2k 54.9k
1% 1%
PRIMARY
INPUT
SUPPLY
RESET
1.8V
POWER MANAGEMENT
CONTOLLER
N-CHANNEL
×2
Q1
2N7002
1696 F03
Figure 3. Back-to-Back N-Channel MOSFETs for Low Supply Application
For more information www.linear.com/LTC1696
1696fb
11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet LTC1696.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LTC1690 | Differential Driver and Receiver Pair with Fail-Safe Receiver Output |  Linear Technology |
| LTC1690C | Differential Driver and Receiver Pair with Fail-Safe Receiver Output | Linear Technology |
| LTC1690CMS8 | Differential Driver and Receiver Pair with Fail-Safe Receiver Output | Linear Technology |
| LTC1690CN8 | Differential Driver and Receiver Pair with Fail-Safe Receiver Output | 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 |