UTC GV4145AG-D08-T Low power ground fault interrupter Datasheet

UNISONIC TECHNOLOGIES CO., LTD
GV4145A
LINEAR INTEGRATED CIRCUIT
LOW POWER GROUND FAULT
INTERRUPTER

DESCRIPTION
The UTC GV4145A 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
opamp, and an SCR driver. With the addition of two sense
transformers, a bridge rectifier, an SCR, a relay, and a few
additional components, the UTC GV4145A will detect and protect
against both hot wire to ground and neutral wire to ground faults.
Ease of application and long-term reliability.

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
* I deal for 120V or 220V systems

ORDERING INFORMATION
Ordering Number
Lead Free
Halogen Free
GV4145AG-D08-T
GV4145AG-D08-T
GV4145AG-S08-R
GV4145AL-S08-R

Package
Packing
DIP-8
SOP-8
Tube
Tape Reel
(1)Packing Type
(1) T: Tube, R: Tape Reel
(2)Package Type
(2) D08: DIP-8, S08: SOP-8
(3)Green Package
(3) L: Lead Free, G: Halogen Free and Lead Free
MARKING
DIP-8
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
SOP-8
1 of 7
QW-R122-006.C
GV4145A

PIN CONFIGURATION

BLOCK DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
LINEAR INTEGRATED CIRCUIT
2 of 7
QW-R122-006.C
GV4145A

LINEAR INTEGRATED CIRCUIT
INTERNAL SCHEMATIC DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
3 of 7
QW-R122-006.C
GV4145A

LINEAR INTEGRATED CIRCUIT
ABSOLUTE MAXIMUM RATING
PARAMETER
SYMBOL
RATINGS
UNIT
Supply Current
ICC
18
mA
Power Dissipation
PD
500
mW
Junction Temperature
TJ
125
°C
Operating Temperature
TOPR
-35~+85
°C
Storage Temperature
TSTG
-65~+150
°C
Note: Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.

THERMAL RESISTANCES CHARACTERISTICS
PARAMETER
Junction-to-Ambient

MIN
θJA
TYP
240
160
MAX
UNIT
°C/W
°C/W
ELECTRICAL CHARACTERISTICS (TA=25°C, IS=1.5mA )
PARAMETER
Detector Reference Voltage
SHUNT REGULATOR
Zener Voltage
Reference Voltage
Quiescent Current
OPERATIONAL AMPLIFIER
Offset Voltage
+Output Voltage Swing
- Output Voltage Swing
+Output Source Current
- Output Source Current
Gain Bandwidth Product
R1 Resistors
R2 Resistors
R3 Resistors
SCR Trigger Voltage Detector ON
SCR Trigger Voltage Detector OFF

SYMBOL
SOP-8
DIP-8
SYMBOL
TEST CONDITIONS
VREF(DET) Pin 7 ~ Pin 3
VZ
VREF
IQ
MIN
6.8
TYP
7.2
MAX
8.1
UNIT
±V
25
12.5
26
13
450
29.2
14.6
750
V
V
μA
-3.0
6.8
-9.5
+3.0
8.1
-13.5
3.5
1.5
0
0.5
7.2
-11.2
650
1.0
1.8
10
10
4.7
2.8
1
10
MV
V
V
μA
mA
MHz
KΩ
KΩ
KΩ
V
mV
MIN
6.5
TYP
7.2
MAX
8.3
UNIT
±V
Pin 6 ~ Pin 4
Pin 3 ~ Pin 4
+Vs=23V
24
12
26
13
500
30
15
V
V
μA
Pin 2 ~ Pin 3
Pin 7 ~ Pin 3
Pin 7 ~ Pin 3
F=50KHZ
Pin 1 ~ Pin 3, IS=0mA
Pin 2 ~ Pin 3, IS=0mA
Pin 5 ~ Pin 4, IS=0mA
Pin 5 ~ Pin 4
Pin 5 ~ Pin 4
-5.0
6.5
-9.
0.5
7.2
-11.2
1.8
10
10
4.7
2.8
3
+5.0
8.3
-14
mV
V
V
MHz
KΩ
KΩ
KΩ
V
mV
Pin 6 ~ Pin 4
Pin 3 ~ Pin 4
+Vs=24V
VOS
PIN 2 ~ PIN 3
VOH
Pin 7 ~ Pin 3
VOL
Pin 7 ~ Pin 3
IO(SOURC Pin 7 ~ Pin 3
IO(SINK)
Pin 7 ~ Pin 3
GBW
F=50KHZ
R1
Pin 1 ~ Pin 3 ,IS=0mA
R2
Pin 2 ~ Pin 3 ,IS=0mA
R3
Pin 5 ~ Pin 4 ,IS=0mA
VON(SCR) Pin 5 ~ Pin 4
VOFF(SCR) Pin 5 ~ Pin 4
1.0
5.9
ELECTRICAL CHARACTERISTICS (-35°C ≤ TA ≤ +85°C, IS=1.5mA)
PARAMETER
Detector Reference Voltage
Shunt Regulator
Zener Voltage
Reference Voltage
Quiescent Current(Is)
Operational Amplifier
Offset Voltage
+Output Voltage Swing
- Output Voltage Swing
Gain Bandwidth Product
Resistors R1
Resistors R2
Resistors R3
SCR Trigger Voltage Detector On
SCR Trigger Voltage Detector Off
SYMBOL
VREF(DET)
Vz
VREF
IQ
VOS
VOH
VOL
GBW
R1
R2
R3
VON(SCR)
VOFF(SCR)
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
TEST CONDITIONS
Pin 7 ~ Pin 3
3.5
1.3
0
5.9
50
4 of 7
QW-R122-006.C
GV4145A

LINEAR INTEGRATED CIRCUIT
PRINCIPLES OF OPERATION
PRINCIPLES OF OPERATION
The 26V shunt regulator voltage generated by the string of zener diodes is divided into three reference
voltages:3/4Vs, 1/2Vs, and 1/4Vs. VREF is at 1/2Vs and is used as a reference to create an artifical ground of +13V at
the op amp noniverting input.
Figure 1 shows a three-wire 120V AC outlet GFI application using an UTC GV4145A, Fault signals from the sense
transformer are AC coupled into the input and are amplified according to the following equation:
V7=RSENSE×ISENSE/N
Where V7 is the RMS voltage at pin7 relative to pin 3, RSENSE is the value of the feedback resistor connected from
pin 7 to pin 1, ISENSE is the fault current in amps RMS and N is the turns ratio of the transformer. When V7 exceeds
plus or minus 7.2V relative to pin 3 the SCR Trigger output will go high and fire the external SCR.
The formula for V7 is approximate because it does not include the sense transformer characteristics.
Grounded neutral fault detection is accomplished when a short or fault closes a magnetic path between the sense
transformer 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.
SHUNT REGULATOR
RLINE limits the current into the shunt regulator; 220V 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).
OPERATIONAL AMPLIFIER
RSENSE is a feedback resistor that sets gain and therefore sensitivity to normal faults. To adjust RSENSE, follow this
procedure: apply the desired fault current (a difference in current of 5mA is the UL943 standard). Adjust RSENSE
upward until the SCR activates. A fixed resistor can be used for RSENSE, since the resultant ±15% variation in
sensitivity will meet UL’s 943 4~6mA specification window.
The roll-off frequency is greater than the grounded neutral fault oscillation frequency, in order to preserve loop
gain for oscillation (which is determined by the inductance of the 200:1 transformer and C4).
The sensitivity to grounded neutral faults is adjusted by changing the frequency of oscillation. Increasing the
frequency 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 2Ωor less.
The input to the op amp are protected from overvoltage by back-to back diodes.
SCR DRIVER
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 have a gate drive requirement of less than
200μA.CF is a noise filter capacitor that prevents narrow pulses from firing the SCR.
The relay solenoid used should have a 3ms or less response time in order to meet the UL 943 timing requirement.
SENSE TRANSFORMERS AND CORES
The sense and grounded neutral transformer cores are usually 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.
TWO-WIRE APPLICATION CIRCUIT
Figure 2 shows the diagram of a 2-wire 120V AC outlet GFI circuit using an UTC GV4145A. 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.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
5 of 7
QW-R122-006.C
GV4145A

LINEAR INTEGRATED CIRCUIT
TYPICAL APPLICATION CIRCUIT
Line
Figure 1. GFI Application Circuit (Three-Wire Outlet)
Figure 2. GFI Application Circuit (Two-Wire Outlet)
Note: Value depends on transformer characteristics.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
6 of 7
QW-R122-006.C
GV4145A
LINEAR INTEGRATED CIRCUIT
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
7 of 7
QW-R122-006.C
Similar pages