© Semiconductor Components Industries, LLC, 2012
December, 2012 − Rev. 0
1Publication Order Number:
NCS37000/D
NCS37000
Ground Fault Circuit
Interrupter (GFCI)
Description
The NCS37000 is a fully UL943 compliant signal processor for
GFCI applications. The device integrates a flexible power supply
(including both shunt and LDO regulators), differential fault, and
grounded-neutral detection circuits. Proprietary impedance
measurement and signal processing techniques are used to minimize
the number of external components and improve performance. The
device also includes a specialized DSP controller that offers best in
class immunity to nuisance loads without the need for external analog
filters.
Features
•6.0 – 12 Volt Operation (120 − 480 V AC mains with the appropriate
series impedance)
•−40 to 85°C
•Very Low Power Consumption: <5 mW @ 5 V
•16 Pin QFN Package or 20 Pin TSSOP Package
•Single Current Transformer (CT) Detection of both Differential and
Grounded−Neutral Faults
•Self Syncing Internal Oscillator Adjusts to AC Mains Frequency to
Guarantee Full Resolution on 50 and 60 Hz Distribution Systems
•Optimized Solenoid Deployment (coil is not energized near the AC
mains zero crossings)
•Randomized Testing Sequence to Minimize Noise and Potential
Interactions on the AC Mains
•>5 mA SCR Driver for use with High Igt SCR’s for Improved Noise
Immunity
•Superior Immunity to Nuisance Loads/Noise (up to 10 A) without
Loss of Detection Capability or CT Saturation
•These Devices are Pb−Free, Halogen Free/BFR Free and are RoHS
Compliant
Typical Applications
•Load Panel GFCI Breakers
•GFCI Receptacles
•In−line GFCI Circuits (power cords)
1
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QFN16
MN SUFFIX
CASE 485G
MARKING DIAGRAMS
PIN CONNECTIONS
A = Assembly Location
L = Wafer Lot
Y = Year
W = Work Week
G= Pb−Free Package
37000
MNG
ALYW
G
MLD
CTresGN
CTbias
CTstim
CTresD
IDF
Supply
SCRdrv
GND (Top View)
Device Package Shipping†
NCS37000MNTWG QFN16
(Pb−Free)
2500/Tape & Reel
NCS37000MNG 120 Units / Tube
ORDERING INFORMATION
NCS37000DBRG TSSOP20
(Pb−Free)
2500/Tape & Reel
NCS37000DBG 74 Units / Tube
1
†For information on tape and reel specifications,
including part orientation and tape sizes, please
refer to our Tape and Reel Packaging Specification
Brochure, BRD8011/D.
1
20
TSSOP−20
DA SUFFIX
CASE 948E
3700
0DBG
ALYWG
NCS37000
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2
Control Logic and
Digital Filter
IDF
Supply
TE
Self
Trimmed
RC Osc
Waveform
Generator
HV
Bandgap
POR
Brown
Out
SCRdrv
Driver
Vbias
Low
Pass
Filter
CTbias
CTstim
CTresGN
VSS
+
+
−
−
AVDD/
DVDD
Mixer
Differential Current
Detection
Grounded Neutral
Detection
Offset
Correction
G2N
Randomizer
Mains Level
Detect (Zero
Cross)
MLD
CTresD
TestDin1−5
TestDout1−2
Figure 1. Simplified Block Diagram
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Table 1. PIN FUNCTION DESCRIPTION − QFN
Pin # Name Pad Description
0 Ground QFN center slug
1 MLD Mains Level Detect (Zero Cross)
2 CTresGN Determines IV converter gain for detection threshold / matched to CT turns ratio (Ground-Neutral)
3 CTbias Direct connection to the CT
4 CTstim Direct connection to the CT
5 CTresD Determines IV converter gain for detection threshold / matched to CT turns ratio (Differential Current)
6 IDF Front end noise filter capacitor
7 NC Tie to Ground or leave floating
8 NC Float
9 NC Tie to Ground or leave floating
10 NC Tie to Ground or leave floating
11 NC Tie to Ground or leave floating
12 NC Tie to Ground or leave floating
13 NC Float
14 NC Float
15 SCRdrv Used to trigger the solenoid at a fault detection
16 Supply Power supply
Table 2. PIN FUNCTION DESCRIPTION − TSSOP
Pin # Name Pad Description
1 CTstim Differential and ground to neutral stimulus point for the current transformer
2 Ground Ground connection for IC
3 CTresD Determines IV converter gain for detection threshold / matched to CT turns ratio (Differential Current)
4 IDF Determines corner frequency of the differential current path filter
5 GFtest Output to induce external differential current
6 NC Tie to Ground or leave floating
7 NC Float
8 NC Tie to Ground or leave floating
9 NC Tie to Ground or leave floating
10 NC Tie to Ground or leave floating
11 Ground Ground connection for IC
12 NC Float
13 NC Float
14 SCRdrv Used to trigger the solenoid at a fault detection
15 DVDD Internal digital 5 V regulated supply
16 AVDD Internal analog 5 V regulated supply
17 Supply 12 V shunt regulated power supply
18 MLD Mains Level Detect (Zero Cross) and AM slope detect (for oscillator sync/trim and AM init)
19 CTresGN Determines IV converter gain for detection threshold / matched to CT turns ratio (Ground-Neutral)
20 CTbias External 2 V bias for the current transformer
NCS37000
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4
Table 3. ABSOLUTE MAXIMUM RATINGS
Rating Symbol Value Unit
Supply Voltage Range Vs 6.0 to 12 V V
Input Voltage Range (Note 1) Vin −0.3 to 6.0 V
Output Voltage Range Vout −0.3 to 6.0 V or (Vin + 0.3),
whichever is lower
V
Maximum Junction Temperature TJ(max) 140 °C
Storage Temperature Range TSTG −65 to 150 °C
ESD Capability, Human Body Model (Note 2) ESDHBM 2 kV
ESD Capability, Machine Model (Note 2) ESDMM 200 V
Lead Temperature Soldering
Reflow (SMD Styles Only), Pb−Free Versions (Note 3)
TSLD 260 °C
Stresses exceeding Maximum Ratings may damage the device. Maximum Ratings are stress ratings only. Functional operation above the
Recommended Operating Conditions is not implied. Extended exposure to stresses above the Recommended Operating Conditions may affect
device reliability.
1. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
2. This device series incorporates ESD protection and is tested by the following methods:
ESD Human Body Model tested per AEC−Q100−002 (EIA/JESD22−A114)
ESD Machine Model tested per AEC−Q100−003 (EIA/JESD22−A115)
Latchup Current Maximum Rating: v150 mA per JEDEC standard: JESD78
3. For information, please refer to our Soldering and Mounting Techniques Reference Manual, SOLDERRM/D
Table 4. THERMAL CHARACTERISTICS
Rating Symbol Value Unit
Thermal Characteristics, QFN16, 3x3.3 mm (Note 4)
Thermal Resistance, Junction−to−Air (Note 5) RqJA 64
°C/W
Thermal Characteristics, TSOP−5 (Note 4)
Thermal Resistance, Junction−to−Air (Note 5) RqJA 118.6
°C/W
4. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
5. Values based on copper area of 645 mm2 (or 1 in2) of 1 oz copper thickness and FR4 PCB substrate.
Table 5. OPERATING RANGES (Note 6)
Parameter Conditions Min Typ Max Units
Operating Temperature −40 85 C
IDD in typical power state 2.0 mA
Stimulus Generator Frequency Tri−tone 3.1 3.4 kHz
SCR Trigger Current 8.0 mA
SCR Trigger output voltage With 5 V supply 4.5 5.5 V
Fault Current Sensitivity Programmable with CTresD 4.6 4.8 5.0 mA
Ground Fault Response Time 5 − 20 mA 150 ms
Ground Fault Response Time 20 − 40 mA 75 ms
Ground Fault Response Time >40 mA 25 ms
Saturation Fault Response Time >300 mA 1.4 ms
CT Turns Ratio 200 300
Ground – Neutral Detection Threshold Total series impedance (Rn and Rg) 3.0 6.0 W
Internal Oscillator Frequency 2.0 MHz
CT Stimulus Current Internally limited 1.0 mA
CT Driver Closed Loop BW 500 kHz
6. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
NCS37000
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5
APPLICATIONS INFORMATION
Figure 2. Typical Application Schematic
PHASE
ResMLD
LINE
LOAD
CapGN
ResGN
MLD
CTresGN
CTbias
CTstim
TE
NC
NC
CTresD Supply
SCRdrv
PHASE
CapIDF
ResMain
ResD
IDF
NEUTRAL
NEUTRAL
NC
NC
NC
CapCT
CapBIAS
NC
NC
ResCT
CapSup
solenoid
tvs
NCS37000
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RECOMMENDED EXTERNAL COMPONENTS:
Component Type Instance Value Note
SCR Q1 −ON−MCR08
Diode Dx −ON−1N4007
Capacitor Csup 1 − 5 mFFor a full bridge rectifier
Capacitor Cgn 2 − 10 nF Low pass corner frequency for GN detection
Capacitor Cidf 220 nF 1kHz differential corner frequency
Capacitor Cct 2.2 − 5 nF Match to current transformer for resonance
Capacitor Cbias 10 nF Added for filtering
Resistor RctresD 40 − 80K Matched to current transformer
Resistor RctGN 100 − 400K Matched to current transformer
Resistor Rzc 400 − 800K Zero cross detector shunt resistance
Resistor Rmains 10 − 20K For a full bridge rectifier
TVS T1 −~250 − 400 V
Filtering
The analog signal capture portion of the IC includes a
single pole filter that can be set externally with Cidf. This
provides an additional layer of protection against false
tripping under steady state noise conditions. High frequency
steady state noise is common with pumps, motors or other
cyclic noise generators.
Cidf = 220 nF = 1 KHz low pass.
Setting Trip Sensitivity
The CTresD resistor sets the threshold for the differential
current fault levels. Increasing CTresD causes the fault
levels to trip at lower differential currents. CT efficiency at
60 Hz must be considered.
CTresD= 200*#Turns – Subject to CT efficiency at 60 Hz
The CTresGN resistor sets the threshold for ground to
neutral fault detection. The Rt parameter is the desired
ground to neutral resistance trip level. Higher CTresGN
values will cause the part to trip at higher ground to neutral
impedances.
CtresGN = #Turns^2 x Rt/2 – Subject to CT efficiency from
3 kHz to 4 kHz
Setting Grounded−Neutral response time
Cgn is used to define the response time of the
grounded−neutral detection circuit. The analog portion
converts the impedance into a DC voltage and a high
frequency (aliased) component. The capacitor is used to
remove the high frequency component leaving just the DC
representation of the impedance.
CTcapGN= 1.8E-4/CTresGN
NCS37000
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PACKAGE DIMENSIONS
TSSOP−20
CASE 948E−02
ISSUE C
DIM
A
MIN MAX MIN MAX
INCHES
6.60 0.260
MILLIMETERS
B4.30 4.50 0.169 0.177
C1.20 0.047
D0.05 0.15 0.002 0.006
F0.50 0.75 0.020 0.030
G0.65 BSC 0.026 BSC
H0.27 0.37 0.011 0.015
J0.09 0.20 0.004 0.008
J1 0.09 0.16 0.004 0.006
K0.19 0.30 0.007 0.012
K1 0.19 0.25 0.007 0.010
L6.40 BSC 0.252 BSC
M0 8 0 8
____
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ANSI Y14.5M, 1982.
2. CONTROLLING DIMENSION: MILLIMETER.
3. DIMENSION A DOES NOT INCLUDE MOLD
FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH OR GATE BURRS SHALL NOT
EXCEED 0.15 (0.006) PER SIDE.
4. DIMENSION B DOES NOT INCLUDE
INTERLEAD FLASH OR PROTRUSION.
INTERLEAD FLASH OR PROTRUSION
SHALL NOT EXCEED 0.25 (0.010) PER SIDE.
5. DIMENSION K DOES NOT INCLUDE
DAMBAR PROTRUSION. ALLOWABLE
DAMBAR PROTRUSION SHALL BE 0.08
(0.003) TOTAL IN EXCESS OF THE K
DIMENSION AT MAXIMUM MATERIAL
CONDITION.
6. TERMINAL NUMBERS ARE SHOWN FOR
REFERENCE ONLY.
7. DIMENSION A AND B ARE TO BE
DETERMINED AT DATUM PLANE −W−.
ÍÍÍÍ
ÍÍÍÍ
ÍÍÍÍ
110
1120
PIN 1
IDENT
A
B
−T−
0.100 (0.004)
C
DGH
SECTION N−N
K
K1
JJ1
N
N
M
F
−W−
SEATING
PLANE
−V−
−U−
S
U
M
0.10 (0.004) V S
T
20X REFK
L
L/2
2X
S
U0.15 (0.006) T
DETAIL E
0.25 (0.010)
DETAIL E
6.40 0.252
--- ---
S
U0.15 (0.006) T
7.06
16X
0.36 16X
1.26
0.65
DIMENSIONS: MILLIMETERS
1
PITCH
SOLDERING FOOTPRINT
NCS37000
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PACKAGE DIMENSIONS
ÇÇÇ
ÇÇÇ
ÇÇÇ
QFN16 3x3, 0.5P
CASE 485G
ISSUE F
16X
SEATING
PLANE
L
D
E
0.10 C
A
A1
e
D2
E2
b
1
4
8
9
16
NOTES:
1. DIMENSIONING AND TOLERANCING PER
ASME Y14.5M, 1994.
2. CONTROLLING DIMENSION: MILLIMETERS.
3. DIMENSION b APPLIES TO PLATED
TERMINAL AND IS MEASURED BETWEEN
0.25 AND 0.30 MM FROM TERMINAL.
4. COPLANARITY APPLIES TO THE EXPOSED
PAD AS WELL AS THE TERMINALS.
B
A
0.10 CTOP VIEW
SIDE VIEW
BOTTOM VIEW
PIN 1
LOCATION
0.05 C
0.05 C
(A3)
C
NOTE 4
16X
0.10 C
0.05 C
A B
NOTE 3
K
16X
L1
DETAIL A
L
ALTERNATE TERMINAL
CONSTRUCTIONS
ÉÉ
ÇÇ
ÇÇ
A1
A3
L
ÉÉ
ÉÉ
DETAIL B
MOLD CMPDEXPOSED Cu
ALTERNATE
CONSTRUCTIONS
DETAIL A
DETAIL B
*For additional information on our Pb−Free strategy and soldering
details, please download the ON Semiconductor Soldering and
Mounting Techniques Reference Manual, SOLDERRM/D.
RECOMMENDED
2X
0.50
PITCH
1.84 3.30
1
DIMENSIONS: MILLIMETERS
0.58
16X
2X
0.30
16X
OUTLINE
PACKAGE
2X
2X
0.10 C A B
e/2
SOLDERING FOOTPRINT*
DIM MIN NOM MAX
MILLIMETERS
A0.80 0.90 1.00
A1 0.00 0.03 0.05
A3 0.20 REF
b0.18 0.24 0.30
D3.00 BSC
D2 1.65 1.75 1.85
E3.00 BSC
E2 1.65 1.75 1.85
e0.50 BSC
K0.18 TYP
L0.30 0.40 0.50
L1 0.00 0.08 0.15
ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice
to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability
arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages.
“Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All
operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. SCILLC does not convey any license under its patent rights
nor the rights of others. SCILLC products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications
intended to support or sustain life, or for any other application in which the failure of the SCILLC product could create a situation where personal injury or death may occur. Should
Buyer purchase or use SCILLC products for any such unintended or unauthorized application, Buyer shall indemnify and hold SCILLC and its officers, employees, subsidiaries, affiliates,
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NCS37000/D
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