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PDF LTC1177-12 Data sheet ( Hoja de datos )
| Número de pieza | LTC1177-12 | |
| Descripción | Isolated MOSFET Drivers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1177-5/LTC1177-12
Isolated MOSFET Drivers
FEATURES
s UL Recognized ®
File E151738 to UL1577
s No Secondary Power Supply
s Drives Any Logic Level FET
s Low Input Current: 1mA Typ (LTC1177-5),
2.5mA Typ (LTC1177-12)
s Turns On in 1ms Typ and Turns Off in 1ms Typ
s 2500VRMS of Isolation Voltage
s Isolates Input from High Voltage Transients at Load
s Clean, Bounce-Free Switching
s Current Limit
s Small Outline Package
APPLICATI S
s Solid State Relay
s Isolated Solenoid Driver
s Isolated Motor Driver
s Isolated Lamp Driver
DESCRIPTIO
The LTC®1177-5/LTC1177-12 are isolated high side
MOSFET drivers. When used with an external N-channel
MOSFET, the LTC1177-5/LTC1177-12 form an isolated
solid state switch for reliable bounce-free switching op-
eration. The output does not require an auxiliary power
supply to maintain an on-state condition.
Two lead frame capacitors are used to transfer energy
from the input to drive the gate of the MOSFET and provide
the necessary isolation. Unlike optoisolated FET drivers,
the input current for the LTC1177-5 is only 1mA and
2.5mA for LTC1177-12. It also does not have the aging
problems endemic to optocouplers.
Both devices provide 2500VRMS (1 minute) or 3000VRMS
(1 second) of output-to-input isolation.
The LTC1177-5/LTC1177-12 are available in the 18-pin
PDIP or 28-pin SW package.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
Isolated High Side Switch
5V OR 12V
0V
f = 50Hz
V+ = 40V
+ 47µF
50V
MTD3055EL
1
VIN
18
GND1
LTC1177-5
LTC1177-12
ISOLATION BARRIER
7 NC
8 NC
9
OUT
12
NC
11
GND2
10
SENSE
ROUT
50Ω
VOUT
1177 TA01
VOUT
VIN
Input vs Output
1177 TA02
1
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
LTC1177-5/LTC1177-12
LTC1177-12
Output Voltage vs Temperature
6.4
VIN = 12V
6.2 NO LOAD
6.0
SW28
5.8
N18
5.6
5.4
5.2
5.0
–55 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1177-12 G13
LTC1177-12
Output Voltage vs Input Voltage
8
TA = 25°C
7
SW28
6
N18
5
4
3
9 10 11 12 13 14 15
INPUT VOLTAGE (V)
1177-12 G15
LTC1177-12
Input Current vs Temperature
3.0
VIN = 12V
2.8 NO LOAD
2.6
2.4
N18
2.2
SW28
2.0
1.8
1.6
–55 –25
0 25 50 75
TEMPERATURE (°C)
100 125
1177-12 G14
LTC1177-12
Input Current vs Input Voltage
3.4
TA = 25°C
3.0
2.6
N18
2.2 SW28
1.8
1.4
9
10 11 12 13
INPUT VOLTAGE (V)
14 15
1177-12 G16
PIN FUNCTIONS
VIN: Voltage Input, 5.25V ≥ VIN ≥ 4.75V (LTC1177-5) and
12.6V ≥ VIN ≥ 11.4V (LTC1177-12). Connect a 0.01µF
capacitor between VIN and GND1 when the source imped-
ance is high or the VIN connection is long.
OUT: Output Voltage. The output voltage level is 8V (typ)
for SW package and 7.5V (typ) for N package (LTC1177-
5) with 5V at VIN pin; 5.7V (typ) for SW package and 5.2V
(typ) for N package (LTC1177-12) with 12V at VIN pin. This
pin is to drive the gate of the external N-channel MOSFET.
SENSE: Current Limit Sense Input. Connecting a 1Ω resis-
tor from the Sense pin to GND2 limits the current through
the power MOSFET to 620mA (typ). ILIM = 620mV/RSENSE.
GND2: Floating Ground Connects to the source of the
external N-channel MOSFET.
GND1: Input Ground. The ground connection of the input
control signal.
5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet LTC1177-12.PDF ] | |
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