NCS37005
Product Preview
Ground Fault Interrupter
(GFI)
Description
The NCS37005 is a signal processor for GFI applications. The
device integrates a flexible power supply (including both shunt and
LDO regulators), and differential fault detection circuits. The
proprietary fault processing circuitry offers high performance with
low turns ratio ferrite current transformers. 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
http://onsemi.com
1
QFN 16
MN SUFFIX
CASE 485G
16
TSSOP 16
DA SUFFIX
CASE 948F
1
•
6.0 – 18 Volt Operation (120
−
480 V AC Mains with the Appropriate
•
•
•
•
•
•
•
•
•
•
MARKING DIAGRAM
XXXXX
ALYWG
CCCCC
XXXXX
A
L
Y
W
G or
G
CCCCC
= Specific Device Code
= Assembly Location
= Wafer Lot
= Year
= Work Week
= Pb−Free Package
= Country of Origin
Series Impedance)
−40
to 85°C
Very Low Power Consumption: <5 mW @ 5 V
16 Pin QFN Package
Low Cost/Turns Ratio Ferrite Current Transformer (CT) Detection of
Differential
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 Additional Immunity to Supply
Noise/Interference
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
PIN CONNECTIONS
Supply
SCRdrv
MLD
CTresGN
CTbias
CTstim
1
GND
(Top View)
Typical Applications
•
Load Panel GFI/RCD Breakers
•
GFI Receptacles
•
In−line GFI Circuits (power cords)
This document contains information on a product under development. ON Semiconductor
reserves the right to change or discontinue this product without notice.
ORDERING INFORMATION
Device
NCS37005MNTWG
NCS37005MNG
NCS37005DARG
NCS37005DAG
Package
QFN16
QFN16
TSSOP20
TSSOP20
Shipping
†
Tape & Reel
Tube
Tape & Reel
Tube
†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.
©
Semiconductor Components Industries, LLC, 2012
April, 2012
−
Rev. P0
1
CTresD
IDF
Publication Order Number:
NCS37005/D
NCS37005
Supply
Brown
Out
HV
Bandgap
−
+
AVDD/
DVDD
−
+
POR
CTresGN
IDF
Low
Pass
Filter
Mixer
CTresD
Grounded Neutral
Detection
Differential Current
Detection
SCRdrv
Self
Trimmed
RC Osc
Control Logic and
Digital Filter
TE
Offset
Correction
Driver
CTstim
Waveform
Generator
TestDin1−5
TestDout1−2
MLD
Vbias
CTbias
G2N
Randomizer
Mains Level
Detect (Zero
Cross)
Figure 1. Simplified Block Diagram
http://onsemi.com
2
VSS
NCS37005
Table 1. PIN FUNCTION DESCRIPTION
−
QFN
Pin #
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
Ground
MLD
CTtest
CTbias
CTstim
CTresD
IDF
NC
NC
NC
NC
NC
NC
NC
NC
SCRdrv
Supply
QFN center slug
Mains Level Detect (Zero Cross)
Test port (Must be tied to CTbias in functional mode).
2 V reference that is connected to the external CT sensor
Differential current measurement port for external CT
Determines IV converter gain for detection threshold / matched to CT turns ratio (Differential Current)
Front end noise filter capacitor
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Float
Float
Used to trigger the solenoid at a fault detection
Power supply
Pad Description
Table 2. PIN FUNCTION DESCRIPTION
−
TSSOP
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Name
CTstim
Ground
CTresD
IDF
TE
NC
NC
NC
NC
NC
NC
NC
SCRdrv
Supply
MLD
CTbias
Pad Description
Differential current measurement port for external CT
Main ground connection for IC.
Determines IV converter gain for detection threshold / matched to CT turns ratio (Differential Current)
Front end noise filter capacitor
Test enable
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Tie to Ground or leave floating
Float
Float
Used to trigger the solenoid at a fault detection
Power supply
Mains Level Detect (Zero Cross)
2 V reference that is connected to the external CT sensor
http://onsemi.com
3
NCS37005
Table 3. ABSOLUTE MAXIMUM RATINGS
Rating
Supply Voltage Range
Input Voltage Range (Note 1)
Output Voltage Range
Maximum Junction Temperature
Storage Temperature Range
ESD Capability, Human Body Model (Note 2)
ESD Capability, Machine Model (Note 2)
Lead Temperature Soldering
Reflow (SMD Styles Only), Pb−Free Versions (Note 3)
Symbol
Vs
V
in
V
out
T
J(max)
TSTG
ESDHBM
ESDMM
T
SLD
Value
6.0 to 19 V
−0.3
to 6.0
−0.3
to 6.0 V or (V
in
+ 0.3),
whichever is lower
140
−65
to 150
2
200
260
Unit
V
V
V
°C
°C
kV
V
°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
Thermal Characteristics, QFN16, 3x3.3 mm (Note 4)
Thermal Resistance, Junction−to−Air (Note 5)
Thermal Reference, Junction−to−Lead2 (Note 5)
Thermal Characteristics, TSOP−5 (Note 4)
Thermal Resistance, Junction−to−Air (Note 5)
Symbol
R
θJA
R
ψJL
R
θJA
Value
64
Unit
°C/W
°C/W
4. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
5. Values based on copper area of 645 mm
2
(or 1 in
2
) of 1 oz copper thickness and FR4 PCB substrate.
Table 5. OPERATING RANGES
(Note 6)
Parameter
Operating Temperature
IDD
SCR Trigger Current
SCR Trigger output voltage
Fault Current Sensitivity
Ground Fault Response Time
Ground Fault Response Time
Ground Fault Response Time
CT Turns Ratio
Internal Oscillator Frequency
CT Driver Closed Loop BW
6. Refer to ELECTRICAL CHARACTERISTICS and APPLICATION INFORMATION for Safe Operating Area.
With 5 V supply
Ground Fault with
±1%
resistor for RctresD
5−20 mA
20−100 mA
>100 mA
100
2
500
4.5
4.5
5
Conditions
Min
−40
2
8
5
5.5
150
75
25
300
MHz
KHz
Typ
Max
85
Units
C
mA
mA
V
mA
ms
ms
ms
http://onsemi.com
4
NCS37005
APPLICATIONS INFORMATION
Solenoid
Q1
Rmains
Dx
Full Wave Rectifier
or
Switch mode supply
Rzc
Csup
T1
SCRdrv
RctD
IDF
CTresD
Cidf
Supply
MLD
CTresGN
Cgn
CTbias
CTstim
Figure 2. Typical Application Schematic
http://onsemi.com
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
