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PDF LTC1531 Data sheet ( Hoja de datos )
| Número de pieza | LTC1531 | |
| Descripción | Self-Powered Isolated Comparator | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1531 (archivo pdf) en la parte inferior de esta página. Total 16 Páginas | ||
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LTC1531
Self-Powered Isolated
Comparator
FEATURES
s UL Recognized File E151738 to UL1577
s Self-Powered Across Isolation Barrier
s 2500VRMS Isolation
s 2.5V Isolated Reference, ILOAD = 5mAMAX
s Zero-Cross Output for Line Power
s Dual Differential Input Comparator
s High Input Impedance Comparator
U
APPLICATIO S
s Self-Powered Isolated Sensing
s Isolated Temperature Control
s Isolated Voltage Monitor
s Isolated Switch Control
, LTC and LT are registered trademarks of Linear Technology Corporation.
DESCRIPTIO
The LTC®1531 is an isolated self-powered dual differential
comparator. An internal capacitive isolation barrier pro-
vides 2500VRMS of isolation between the comparator and
its output. The part provides UL-rated isolated compari-
sons without the need for an isolated supply since both
comparator power and output data are transmitted across
the capacitive barrier. The comparator data is transferred
differentially across the isolation barrier to provide high
common mode voltage and noise immunity.
The isolated side can supply a 2.5V reference output to
power external sensor circuits such as a thermistor bridge.
The dual differential comparator inputs allow for compari-
son of two differential voltages as well as single-ended
voltages. The powered side provides a latched data output
as well as a pulsed zero-cross comparator output for
controlling a triac. The part is available in a 28-lead SO
package.
TYPICAL APPLICATION
Isolated Thermistor Temperature Controller
AC
120V
TECCOR
Q4008L4
OR EQUIVALENT
NEUTRAL
LOAD
25Ω
150Ω
2N2222
1k
1N4004
3k
3W
750Ω
0.5W
DANGER!
LETHAL VOLTAGES
IN THIS SECTION!
+
20µF
50V
–5.6V
R1
680k
+
100µF
5.6V 390Ω
LED
R2 C1
47k 0.01µF
VCC
ZCDATA
SHDN
ZCPOS ZCNEG
DATA
QD
VALID
GND
LTC1531
ISOLATION
BARRIER
VPW
2.5V VREG
V1
V2
+
V3
–
V4
+
1µF
1
RTHERM =
RO • eB (1/T – 1/TO)
B = 3807
TO = 297°K
THERM
T 30k
YSI 44008
ISOGND
CMPOUT
R5*1M
R4
50k
R6
22k
1 1 1 1531 TA01
1 = ISOLATED GROUND
*HYSTERESIS = 1°C AT TO
1
1 page  
WU W
TI I G DIAGRA
VREG
CMPOUT
VALID
DATA
POWER CYCLE
960µs
POWER
Hi-Z
POWER-LISTEN CYCLE
1152µs
LTC1531
LISTEN CYCLE
192µs
LISTEN
108µs
200ns
1531 TD01
BLOCK DIAGRAM
VCC
VCC 1
VALID 25
DATA 26
QD
R
POWERED SIDE
VOLTAGE
PUMP
TIMING
DECODE
POWER-ON
RESET
+
–
ZCDATA 27
GND 28
ZERO-CROSS
COMPARATOR
43 2
ZCPOS ZCNEG SHDN
ISOLATION
BARRIER
VPW
11
3.3V
DET
TRANSMIT
AND
DRIVER
TIMING
ISOLATED SIDE
LATCH
+
COMPARE
–
Σ
Σ
V1
18
V2
17
V3
16
V4
15
VREG
2.5V
REG
13
14
ISOGND
CMPOUT
12
1531 BD
5
5 Page 
TYPICAL APPLICATIONS
LTC1531
R2
10M
C2, 1µF
VCC
VOUT
0V TO VCC
FULL-SCALE
OUTPUT
RESOLUTION = 4mV
SETTLING TIME = 10sec
LT1490
R3
10M
VCC
10k
10k
VCC
VCC
ZCDATA
DATA
VALID
GND
SHDN
QD
ISOLATION
BARRIER
ZCPOS ZCNEG
VPW
2.5V VREG
V1
V2
+ V3
–
V4
+
2.2µF
1
0V TO 2.5V
FULL-SCALE
INPUT
CMPOUT R1, 1M
LTC1531
1 = ISOLATED GROUND
= EQUIPMENT GROUND
ISOGND
C1
0.22µF
11
DELTA-SIGMA TYPE MODULATION:
1531 F09
CMPOUT IS ON 108µs AT ~300Hz RATE
THEREFORE: 108µs • 300Hz = 1/30TH
TIME CONSTANT = 1M • 30 • 0.22µF = 6.6sec
Figure 9. Isolated Voltage Sense
R2
10M
C2, 1µF
VCC
VOUT
0V TO VCC
FULL-SCALE
OUTPUT
RESOLUTION = 4mV
SETTLING TIME = 10sec
LT1490
R3
10M
VCC
10k
10k
VCC
VCC
ZCDATA
DATA
VALID
GND
ISOLATION
BARRIER
+
2.2µF
SHDN
ZCPOS ZCNEG
QD
VPW 2.5V VREG
V1
V2
+ V3
–
V4
1
100k
1
CMPOUT R1, 1M
LTC1531
1 = ISOLATED GROUND
= EQUIPMENT GROUND
ISOGND
C1
0.22µF
11
DELTA-SIGMA TYPE MODULATION:
1531 TA05
CMPOUT IS ON 108µs AT ~300Hz RATE
THEREFORE: 108µs • 300Hz = 1/30TH
TIME CONSTANT = 1M • 30 • 0.22µF = 6.6sec
Figure 10. Isolated Potentiometer Transducer Sense
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet LTC1531.PDF ] | |
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