CHERRY CS294GN8

CS294
CS294
Ground Fault Interrupter
Features
Description
The CS294 is an AC outlet ground
fault interrupter controller IC. The
IC detects the presence of hazardous grounding conditions and
open circuits the AC line before a
dangerous shock can occur.
The CS294 contains an operational
amplifier, an SCR driver and a 24V
zener shunt regulator. Two sense
coils, a bridge rectifier, a relay and
an SCR are required as external
components. The completed interrupter circuit can detect and protect
against both hot wire to ground
faults and neutral wire to ground
faults.
The CS294 is built on a 30V bipolar
process and is available in 8 lead
DIP packages.
■ Supply Derived from
AC Supply Ñ 24V
■ Direct Interface to SCR
■ Adjustable Sensitivity
■ Grounded Neutral Fault
Detection
Block Diagram
+VS
AmpOUT
-
50kW
VFB
Package Options
+
20kW
Signal
Common
-
SCR
Trigger
+
8 Lead PDIP & SO Narrow
10kW
-
Filter
Detect
VFB 1
+
Bias
Filter
4.7kW
AmpOUT
Signal Common
+VS
Gnd
Gnd
SCR Trigger
Detect
Cherry Semiconductor Corporation
2000 South County Trail, East Greenwich, RI 02818
Tel: (401)885-3600 Fax: (401)885-5786
Email: info@cherry-semi.com
Web Site: www.cherry-semi.com
Rev. 1/20/99
1
A
¨
Company
CS294
Absolute Maximum Ratings
Operating Junction Temperature, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150¡C
Lead Temperature Soldering:
Wave Solder (through hole styles only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Sec. max 260ûC Peak
Reflow (SMD styles only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 sec. max above 183¡C, 230¡ peak
Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65¡C to 150¡C
Pin Symbol
VFB
Filter
Signal Common
Gnd
SCR Trigger
+VS
AmpOUT
Detect
Pin Name
Error Amp Inverting Input
Error Amp Non-Inverting Input
Signal Reference Input
Power Supply Return
SCR Driver Output
Shunt Regulator Supply Input
Error Amp Output
Ground Fault Detect Input
VMAX
VMIN
ISOURCE
ISINK
30V
30V
V(+VS) + 1V
0V
30V
-0.3V
-0.3V
V(+VS) - 1V
0V
-0.3V
N/A
1mA
1ma
1mA
1mA
20mA
1mA
1ma
10mA
1mA
30V
30V
6V
-0.3V
-0.3V
-0.3V
1mA
1mA
10mA
1mA
1mA
10mA
Electrical Characteristics: TA = 25¡C.
For ease of testing and improved test accuracy, Signal Common is grounded and a negative voltage is applied to the Gnd pin.
PARAMETER
Supply Current
Negative Supply Voltage Clamp
Positive Supply Voltage Clamp
Output Offset Voltage
Output Resistance
Negative Amp Output Swing
Positive Amp Output Swing
Positive Detect Threshold
Negative Detect Threshold
Detect Leakage Current
Amplifier Open Loop Gain
Operating Temperature Range TA (Note 1)
TEST CONDITIONS
MIN
TYP
+VS
I(SCR Trigger) = 100µA
-14.1
9.7
-400
2.89
8.5
5.9
-7.2
V(SCR Trigger) = 0V
V(VFB) = 1mV RMS @ 50kHz
Note 1: Guaranteed by design.
2
20
0
-11.9
11.9
67
4.70
-10.95
11.5
6.5
-6.5
0.5
90
MAX
UNIT
1.2
-9.7
14.1
+1100
6.78
-8.5
mA
V
V
mV
k½
V
V
V
V
µA
V/V
¡C
7.2
-5.9
5.0
70
PACKAGE PIN #
PIN SYMBOL
FUNCTION
8 Lead PDIP
1
VFB
The VFB pin is the inverting input to the on-chip operational
amplifier.
2
Filter
The Filter pin is the non-inverting input to the on-chip operational amplifier.
3
Signal Common
The Signal Common pin connects to +VS/2, to a 20k½ resistor
tied to VFB and to a 10k½ resistor tied to Filter.
4
Gnd
The Gnd pin is the power return terminal
5
SCR Trigger
The SCR Trigger pin drives the silicon controlled rectifier during fault conditions. An internal 4.7k½ resistor between this pin
and Gnd holds the SCR off in non-fault conditions.
6
+VS
The +VS pin is the power input to the IC.
7
AmpOUT
The AmpOUT pin is the output of the on-chip operational amplifier.
8
Detect
The Detect pin is the fault detector input.
3
CS294
Package Pin Description
CS294
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES)
PACKAGE THERMAL DATA
Thermal Data
D
Lead Count
8 Lead PDIP
8 Lead SO Narrow
Metric
Max
Min
10.16
9.02
5.00
4.80
English
Max Min
.400 .355
.197 .189
RQJC
typ
8 Lead
PDIP
52
RQJA
typ
100
8 Lead
SO Narrow
45
ûC/W
165
ûC/W
Plastic DIP (N); 300 mil wide
7.11 (.280)
6.10 (.240)
8.26 (.325)
7.62 (.300)
1.77 (.070)
1.14 (.045)
2.54 (.100) BSC
3.68 (.145)
2.92 (.115)
.356 (.014)
.203 (.008)
0.39 (.015)
MIN.
.558 (.022)
.356 (.014)
REF: JEDEC MS-001
Some 8 and 16 lead
packages may have
1/2 lead at the end
of the package.
All specs are the same.
D
Surface Mount Narrow Body (D); 150 mil wide
4.00 (.157)
3.80 (.150)
6.20 (.244)
5.80 (.228)
0.51 (.020)
0.33 (.013)
1.27 (.050) BSC
1.75 (.069) MAX
1.57 (.062)
1.37 (.054)
1.27 (.050)
0.40 (.016)
0.25 (.010)
0.19 (.008)
D
0.25 (0.10)
0.10 (.004)
REF: JEDEC MS-012
Ordering Information
Part Number
CS294GN8
CS294GD8
CS294GDR8
Rev. 1/20/99
Description
8 Lead PDIP
8 Lead SO Narrow
8 Lead SO Narrow (tape & reel)
Cherry Semiconductor Corporation reserves the right to
make changes to the specifications without notice. Please
contact Cherry Semiconductor Corporation for the latest
available information.
4
© 1999 Cherry Semiconductor Corporation