UNISONIC TECHNOLOGIES CO., LTD
GM1851
GROUND FAULT
INTERRUPTER
DESCRIPTION
The UTC
GM1851
can specially provide ground fault protection
for AC power outlets in consumer and industrial environments. As
ground fault currents greater than a presentable threshold value, it
will trigger an external SCR-driven circuit breaker to interrupt the
AC line and remove the fault condition. Besides of detection of
conventional hot wire to ground faults, the neutral fault condition is
detected also. In the event that noise pulses introduce unwanted
charging currents and a memory circuit that allows firing of even a
sluggish breaker on either half-cycle of the line voltage when
external full-wave rectification is used, circuitry that rapidly resets
the timing capacitor.
LINEAR INTEGRATED CIRCUIT
FEATURES
* Internal power supply shunt regulator
* Externally programmable fault current threshold
* Externally programmable fault current integration time
* Direct interface to SCR
* Operates under line reversal; both load vs line and hot vs neutral
* Detects neutral line faults
Lead-free:
GM1851L
Halogen-free: GM1851G
ORDERING INFORMATION
Normal
GM1851-S08-R
GM1851-D08-T
Ordering Number
Lead Free
GM1851L-S08-R
GM1851L-D08-T
Halogen Free
GM1851G-S08-R
GM1851G-D08-T
Package
SOP-8
DIP-8
Packing
Tape Reel
Tube
www.unisonic.com.tw
Copyright © 2008 Unisonic Technologies Co., Ltd
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QW-R122-007,B
GM1851
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
SCR Trigger
INVERTING INPUT
NON-INVERTING INPUT
GND
1
2
3
4
8
7
6
5
Vcc
TIMING CAPACITOR
SENSE ITIVITY SET RESISTOR
SENSE AMPLIFIER OUTPUT
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GM1851
INTERNAL SCHEMATIC DIAGRAM
LINEAR INTEGRATED CIRCUIT
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GM1851
BLOCK DIAGRAM
LINEAR INTEGRATED CIRCUIT
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GM1851
ABSOLUTE MAXIMUM RATINGS
PARAMETER
LINEAR INTEGRATED CIRCUIT
SYMBOL
RATINGS
UNIT
Supply Current
I
CC
19
mA
Power Dissipation (Note 1)
P
D
1250
mW
Operating Temperature
T
OPR
-40 ~ +70
°C
Storage Temperature
T
STG
-55 ~ +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.
ELECTRICAL CHARACTERISTICS
(T
a
=25°C, I
SS
=5mA)
PARAMETER
DC CHARACTERISTICS
Power Supply Shunt Regulator Voltage
Latch Trigger Voltage
Sensitivity Set Voltage
Output Saturation Voltage
Output Drive Current
TEST CONDITIONS
MIN
TYP
MAX UNIT
Pin 8, Average Value
22
26
30
V
Pin 7
15
17.5
20
V
Pin 8 to Pin 6
6
7
8.2
V
Pin 1, Without Fault
100 240
mV
Pin 1, With Fault
0.5
1
2.4
mA
Pin 1, Without Fault
2.0
5
mA
Output External Current Sinking Capability
Vpin 1 Held to 0.3V (Note 4)
Output Saturation Resistance
Pin 1, Without Fault
100
Ω
Pin 7, Ratio of Discharge Currents Between
2.0
2.8
3.6
μA/μA
Noise Integration Sink Current Ratio
No Fault and Fault Conditions
AC CHARACTERISTICS
Normal Fault Current Sensitivity
Figure 1 (Note 3)
3
5
7
mA
Normal Fault Trip Time
500Ω Fault, Figure 2 (Note 2)
18
mS
Normal Fault with Grounded Neutral Fault 500Ω Normal Fault, 2Ω Neutral, Figure 2
18
mS
Trip Time
(Note 2)
Note: 1. For operation in ambient temperatures above 25℃, the device must be debated based on a 125℃ maximum
junction temperature and a thermal resistance of 80℃/W junction to ambient for the DIP and 162/W for the
SO Package.
2. Average of 10 trials.
3. Required UL sensitivity tolerance is such that external trimming of UTC GM1851 sensitivity will be necessary.
4. This externally applied current is in addition to the internal ''output drive current '' source.
FIGURE 1.Normal Fault Sensitivity Test Circuit
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