RV4145 [FAIRCHILD]
Low Power Ground Fault Interrupter; 低功耗接地故障断路器
| 型号： | RV4145 |
| 厂家： | 
FAIRCHILD SEMICONDUCTOR |
| 描述： | Low Power Ground Fault Interrupter |
| 文件： | 总11页 (文件大小：369K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
www.fairchildsemi.com
RV4145A
Low Power Ground Fault Interrupter
Features
• No potentiomenter required
• Direct interface to SCR
• Supply voltage derived from AC line – 26V shunt
• Adjustable sensitivity
• Grounded neutral fault detection
• Meets U.L. 943 standards
• 450µA quiescent current
• Ideal for 120V or 220V systems
Description
The RV4145A is a low power controller for AC outlet
ground fault interrupters. These devices detect hazardous
grounding conditions, such as equipment (connected to
opposite phases of the AC line) in contact with a pool of
water and open circuits the line before a harmful or lethal
shock occurs.
Contained internally are a 26V zener shunt regulator, an op
amp, and an SCR driver. WIth the addition of two sense
transformers, a bridge rectifier, an SCR, a relay, and a few
additional components, the RV4145A will detect and protect
against both hot wire to ground and neutral wire to ground
faults. The simple layout and conventional design ensure
ease of application and long-term reliability.
Block Diagram
RV4145A
V
FB
R1
10K
+Input
Op Amp Output
R2
10K
+V
(+26V)
S
V
REF
6.5V
6.5V
6.5V
6.5V
(+13V)
Ground
SCR Trigger
R3
4.7K
65-4145A-01
REV. 1.0.3 3/6/02
PRODUCT SPECIFICATION
RV4145A
Pin Assignments
8-Pin PDIP
8-Pin SOIC
8-Pin MSOP
V
1
2
3
4
8
7
6
5
NC
NC
1
2
3
4
8
7
6
5
V
FB
FB
Op Amp Output
+V
+Input
Op Amp Output
+Input
V
REF
+V
V
S
REF
S
GND
SCR Trigger
GND
SCR Trigger
65-4145A-02
Absolute Maximum Ratings
(beyond which the device may be damaged)
1
Parameter
Min
Typ
Max
Units
mA
mW
°C
Supply Current
18
500
Internal Power Dissipation
Storage Temperature Range
Operating Temperature Range
Junction Temperature
-65
-35
+150
+85
°C
125°C
300
Lead Soldering Temperature
60 Sec, DIP
°C
°C
10 Sec, SOIC, MSOP
260
P T < 50°C
SOIC
PDIP
300
mW
D
A
450
mW
MSOP
SOIC
PDIP
350
mW
For T > 50°C Derate at
A
4
6
mW/°C
mW/°C
mW/°C
MSOP
4.7
Notes:
1. Functional operation under any of these conditions is NOT implied. Performance and reliability are guaranteed only if
Operating Conditions are not exceeded.
Operating Conditions
Parameter
Thermal resistance
Min
Typ
240
160
206
Max
Units
°C/W
°C/W
°C/W
θ
SOIC
PDIP
JA
MSOP
2
REV. 1.0.3 3/6/02
RV4145A
PRODUCT SPECIFICATION
Electrical Characteristics (I = 1.5mA and T = +25°C)
S
A
Parameters
Test Conditions
Min
Typ
Max
Units
Detector Reference Voltage
Shunt Regulator
Pin 7 to Pin 3
6.8
7.2
8.1
V
Zener Voltage (+V )
S
Pin 6 to Pin 4
Pin 3 to Pin 4
25
26
13
29.2
14.6
750
V
V
Reference Voltage (V
)
12.5
REF
Quiescent Current (I )
S
+V = 24V
S
450
µA
Operational Amplifier
Offset Voltage
+Output Voltage Swing
–Output Voltage Swing
+Output Source Current
–Output Source Current
Gain Bandwidth Product
Resistors
Pin 2 to Pin 3
Pin 7 to Pin 3
Pin 7 to Pin 3
Pin 7 to Pin 3
Pin 7 to Pin 3
F = 50KHz
-3.0
6.8
0.5
7.2
+3.0
8.1
mV
V
-9.5
-11.2
650
1.0
-13.5
V
µA
mA
MHz
1.0
1.8
I = 0mA
S
R1
Pin 1 to Pin 3
Pin 2 to Pin 3
Pin 5 to Pin 4
Pin 5 to Pin 4
10
10
kΩ
kΩ
kΩ
R2
R3
3.5
4.7
5.9
10
SCR Trigger Voltage
Detector On
1.5
0
2.8
1
V
Detector Off
mV
Electrical Characteristics (I = 1.5mA and -35°C ≤ T ≤ +85°C)
S
A
Parameters
Test Conditions
Min
Typ
Max
Units
Detector Reference Voltage
Shunt Regulator
Pin 7 to Pin 3
6.5
7.2
8.3
V
Zener Voltage (+V )
S
Pin 6 to Pin 4
Pin 3 to Pin 4
24
12
26
13
30
15
V
V
Reference Voltage (V
)
REF
Quiescent Current (I )
S
+V = 23V
S
500
µA
Operational Amplifier
Offset Voltage
+Output Voltage Swing
–Output Voltage Swing
Gain Bandwidth Product
Resistors
Pin 2 to Pin 3
Pin 7 to Pin 3
Pin 7 to Pin 3
F = 50KHz
-5.0
6.5
-9
0.5
7.2
+5.0
8.3
mV
V
-11.2
1.8
-14
V
MHz
I = 0mA
S
R1
Pin 1 to Pin 3
Pin 2 to Pin 3
Pin 5 to Pin 4
Pin 5 to Pin 4
10
10
kΩ
kΩ
kΩ
R2
R3
3.5
4.7
5.9
50
SCR Trigger Voltage
Detector On
1.3
0
2.8
3
V
Detector Off
mV
REV. 1.0.3 3/6/02
3
PRODUCT SPECIFICATION
RV4145A
The roll-off frequency is greater than the grounded neutral
Principles of Operation
The 26V shunt regulator voltage generated by the string of
fault oscillation frequency, in order to preserve loop gain for
oscillation (which is determined by the inductance of the
200:1 transformer and C4).
zener diodes is divided into three reference voltages: 3/4 V ,
S
1/2 V , and 1/4 V . V
REF
is at 1/2VS and is used as a refer-
S
S
ence to create an artifical ground of +13V at the op amp non-
inverting input.
The senstivity to grounded neutral faults is adjusted by
changing the frequency of oscillation. Increasing the fre-
quency reduces the sensitivity by reducing the loop gain of
the positive feedback circuit. As frequency increases, the
signal becomes attenuated and the loop gain decreases. With
the values shown the circuit will detect a grounded neutral
fault having resistance of 2Ω or less.
Figure 1 shows a three-wire 120V AC outlet GFI application
using an RV4145A. Fault signals from the sense transformer
are AC coupled into the input and are amplified according to
the following equation:
V = R
× I /N
SENSE
7
SENSE
The input to the op amp are protected from overvoltage by
back-toback diodes.
Where V is the RMS voltage at pin 7 relative to pin 3,
7
R
is the value of the feedback resistor connected from
SENSE
pin 7 to pin 1, I
SCR Driver
is the fault current in amps RMS and
SENSE
The SCR used must have a high dV/dt rating to ensure that
line noise (generated by noisy appliances such as a drill
motor) does not falsely trigger the SCR. Also, the SCR must
N is the turns ratio of the transformer. When V exceeds plus
7
or minus 7.2V relative to pin 3 the SCR Trigger output will
go high and fire the external SCR.
have a gate drive requirement of less than 200µA. C is a
F
noise filter capacitor that prevents narrow pulses from firing
the SCR.
The formula for V is approximate because it does not
7
include the sense transformer characteristics.
The relay solenoid used should have a 3ms or less response
time in order to meet the UL 943 timing requirement.
Grounded neutral fault detection is accomplished when a
short or fault closes a magnetic path between the sense trans-
former and the grounded neutral transformer. The resultant
AC coupling closes a positive feedback path around the op
amp, and therefore the op amp oscillates. When the peaks of
the oscillation voltage exceed the SCR trigger comparator
thresholds, the SCR output will go high.
Sense Transformers and Cores
The sense and grounded neutral transformer cores are usu-
ally fabricated using high permeability laminated steel rings.
Their single turn primary is created by passing the line and
neutral wires through the center of its core. The secondary is
usually from 200 to 1500 turns.
Shunt Regulator
R
limits the current into the shunt regulator; 220V
LINE
applications will require substituting a 47kΩ 2W resistor. In
addition to supplying power to the IC, the shunt regulator
creates internal reference voltages (see above).
Magnetic Metals Corporation, Camden, NJ 08101,
(609) 964-7842, and Magnetics, 900 E. Butler Road,
P.O. Box 391, Butler, PA 16003, (412) 282-8282 are full line
suppliers of ring cores and transformers designed specifi-
cally for GFI applications.
Operational Amplifier
R
is a feedback resistor that sets gain and therefore
SENSE
sensitivity to normal faults. To adjust R
, follow this
SENSE
procedure: apply the desired fault current (a difference in
current of 5mA is the UL 943 standard). Adjust R
Two-Wire Application Circuit
Figure 2 shows the diagram of a 2-wire 120V AC outlet GFI
circuit using an RV4145A. This circuit is not designed to
detect grounded neutral faults. Thus, the grounded neutral
transformer and capacitors C3 and C4 of Figure 1 are not
used.
SENSE
upward until the SCR activates. A fixed resistor can be used
for R , since the resultant 15ꢀ variation in sensitivity
SENSE
will meet UL’s 943 4-6mA specification window.
4
REV. 1.0.3 3/6/02
RV4145A
PRODUCT SPECIFICATION
Press
To Test
R
TEST
15K
Ground Neutral
Transformer
Sense Transformer
1000:1
Mov
Latching
Contacts
K1
200:1
Hot
Line
Neutral
R
Load
SENSE
1M *
C1
10µF
C3
0.01 µF
RV4145
V
V
Op Amp Output
FB
Solenoid
C4
0.03 µF
(+13V)
REF
+V
S
GND
SCR Trigger
DB1
R
LINE
24K
1N4004 (4)
Q1 ON Semi
MCR100-6
C2
0.01µF
C
2.2 µF
F
65-4145A-03
* Value depends on transformer characteristics.
Figure 1. GFI Application Circuit (Three-Wire Outlet)
REV. 1.0.3 3/6/02
5
PRODUCT SPECIFICATION
RV4145A
Press
To Test
R
TEST
15K
Sense Transformer
Mov
Latching
Contacts
K1
1000:1
Hot
Line
Neutral
R
Load
SENSE
1M *
C1
10µF
RV4145
V
V
Op Amp Output
FB
Solenoid
(+13V)
REF
+V
S
GND
SCR Trigger
DB1
1N4004 (4)
R
LINE
24K
Q1 Tag
X0103DA
C2
0.01µF
C
F
2.2 µF
65-4145A-04
* Value depends on transformer characteristics.
Figure 2. GFI Application Circuit (Two-Wire Outlet)
6
REV. 1.0.3 3/6/02
RV4145A
PRODUCT SPECIFICATION
Schematic Diagram
REV. 1.0.3 3/6/02
7
PRODUCT SPECIFICATION
RV4145A
Mechanical Dimensions
8-Lead Plastic DIP Package
Notes:
Inches
Millimeters
Min. Max.
Symbol
Notes
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
Min.
Max.
2. "D" and "E1" do not include mold flashing. Mold flash or protrusions
shall not exceed .010 inch (0.25mm).
A
—
.210
—
—
.38
5.33
—
A1
A2
B
.015
.115
.014
.045
.008
3. Terminal numbers are for reference only.
.195
.022
.070
.015
2.93
.36
4.95
.56
4. "C" dimension does not include solder finish thickness.
5. Symbol "N" is the maximum number of terminals.
B1
C
1.14
.20
1.78
.38
4
2
D
.348
.005
.300
.240
.430
—
.325
.280
8.84
.13
10.92
—
D1
E
7.62
6.10
8.26
7.11
2
5
E1
e
.100 BSC
2.54 BSC
eB
L
—
.430
.160
—
10.92
4.06
.115
2.92
N
8°
8°
D
1
4
E1
D1
5
8
e
E
A2
A
A1
C
L
eB
B1
B
8
REV. 1.0.3 3/6/02
RV4145A
PRODUCT SPECIFICATION
Mechanical Dimensions (continued)
8-Lead SOIC Package
Notes:
Inches
Millimeters
Symbol
Notes
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
Min.
Max.
Min.
Max.
2. "D" and "E" do not include mold flash. Mold flash or
protrusions shall not exceed .010 inch (0.25mm).
A
.053
.004
.013
.008
.189
.150
.069
.010
.020
.010
.197
.158
1.35
0.10
0.33
0.20
4.80
3.81
1.75
0.25
0.51
0.25
5.00
4.01
A1
B
3. "L" is the length of terminal for soldering to a substrate.
4. Terminal numbers are shown for reference only.
5. "C" dimension does not include solder finish thickness.
6. Symbol "N" is the maximum number of terminals.
C
D
E
5
2
2
e
.050 BSC
1.27 BSC
H
h
.228
.010
.016
.244
.020
.050
5.79
0.25
0.40
6.20
0.50
1.27
L
3
6
N
α
8
8
0°
8°
0°
8°
ccc
—
.004
—
0.10
8
5
E
H
1
4
h x 45°
D
C
A1
A
α
SEATING
PLANE
– C –
L
e
LEAD COPLANARITY
ccc C
B
REV. 1.0.3 3/6/02
9
PRODUCT SPECIFICATION
RV4145A
Mechanical Dimensions
8-Lead MSOP Package
Package MA08D
0.118 - 0.004
[3 0.1]
–A–
SYMM
C
8
5
(0.189)
[4.8]
0.118 0.004
[3 0.1]
0.193 0.004
[4.9 0.1]
–B–
(0.040)
[1.02]
TYP
PIN 1
IDENT
(0.016)
[0.41]
TYP
(0.0256)
[0.65]
TYP
1
4
LAND PATTERN RECOMMENDATION
TYP
(0.0256)
[0.65]
TYP
0.005
[0.13]
R
GAGE
PLANE
0.030 - 0.037
[0.78 - 0.94]
0.005
TYP
R
[0.13]
(0.010)
[0.23]
–C–
0.002 [0.05]
C
0.021 0.005
[0.53 0.12]
0.012 0.002
[0.3 0.05]
(0.033)
[0.84]
TYP
0°–6° TYP
SEATING PLANE
0.002 - 0.006
TYP
0.0375
[0.953]
[0.06 - 0.15]
0.002 [0.05]
M
A
S
B S
0.007 0.002
[0.18 0.05]
TYP
8-Lead Molded Small Outline Package (MSOP), JEDEC MO-187, 3.0mm Wide
Package Number MA08D
10
REV. 1.0.3 3/6/02
PRODUCT SPECIFICATION
RV4145A
Ordering Information
Part Number
RV4145AN
RV4145AM
RV4145AMU
Package
Operating Temperature Range
-35°C to +85°C
8-Lead Plastic DIP
8-Lead Plastic SOIC
8-Lead Plastic MSOP
-35°C to +85°C
-35°C to +85°C
DISCLAIMER
FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY
PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY
LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER
DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES
OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR
CORPORATION. As used herein:
1. Life support devices or systems are devices or systems
which, (a) are intended for surgical implant into the body,
or (b) support or sustain life, and (c) whose failure to
perform when properly used in accordance with
instructions for use provided in the labeling, can be
reasonably expected to result in a significant injury of the
user.
2. A critical component in any component of a life support
device or system whose failure to perform can be
reasonably expected to cause the failure of the life support
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
3/6/02 0.0m 001
Stock#DS2004145A
2002 Fairchild Semiconductor Corporation
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