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CS294
CS294 Ground Fault Interrupter
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.
Features
s Supply Derived from AC Supply N 24V s Direct Interface to SCR s Adjustable Sensitivity s Grounded Neutral Fault Detection
Block Diagram
AmpOUT +VS
VFB 20kW Signal Common 10kW Filter Bias +
50kW
+ SCR Trigger + 4.7kW
Package Options
8 Lead PDIP & SO Narrow
VFB 1 Filter Signal Common Gnd
Detect AmpOUT +VS SCR Trigger
Gnd
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150C Lead Temperature Soldering: Wave Solder (through hole styles only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Sec. max 260uC Peak Reflow (SMD styles only) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60 sec. max above 183C, 230 peak Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65C to 150C
Pin Symbol Pin Name
VMAX 30V 30V V(+VS) + 1V 0V 30V 30V 30V 6V
VMIN -0.3V -0.3V V(+VS) - 1V 0V -0.3V -0.3V -0.3V -0.3V
ISOURCE N/A 1mA 1ma 1mA 1mA 1mA 1mA 10mA
ISINK 20mA 1mA 1ma 10mA 1mA 1mA 1mA 10mA
VFB Filter Signal Common Gnd SCR Trigger +VS AmpOUT Detect
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
Electrical Characteristics: TA = 25C. For ease of testing and improved test accuracy, Signal Common is grounded and a negative voltage is applied to the Gnd pin.
PARAMETER TEST CONDITIONS MIN TYP MAX UNIT
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) Note 1: Guaranteed by design.
+VS -14.1 9.7 -400 2.89 8.5 5.9 -7.2 V(SCR Trigger) = 0V V(VFB) = 1mV RMS @ 50kHz 20 0 -11.9 11.9 67 4.70 -10.95 11.5 6.5 -6.5 0.5 90
I(SCR Trigger) = 100A
1.2 -9.7 14.1 +1100 6.78 -8.5 7.2 -5.9 5.0 70
mA V V mV k1/2 V V V V A V/V C
2
CS294
Package Pin Description
PACKAGE PIN # PIN SYMBOL FUNCTION
8 Lead PDIP 1 2 3 4 5 VFB Filter Signal Common Gnd SCR Trigger The VFB pin is the inverting input to the on-chip operational amplifier. The Filter pin is the non-inverting input to the on-chip operational amplifier. The Signal Common pin connects to +VS/2, to a 20k1/2 resistor tied to VFB and to a 10k1/2 resistor tied to Filter. The Gnd pin is the power return terminal The SCR Trigger pin drives the silicon controlled rectifier during fault conditions. An internal 4.7k1/2 resistor between this pin and Gnd holds the SCR off in non-fault conditions. The +VS pin is the power input to the IC. The AmpOUT pin is the output of the on-chip operational amplifier. The Detect pin is the fault detector input.
6 7 8
+VS AmpOUT Detect
3
CS294
Package Specification
PACKAGE DIMENSIONS IN mm (INCHES) PACKAGE 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
Thermal Data RQJC RQJA typ typ
8 Lead PDIP 52 100
8 Lead SO Narrow 45 165
uC/W uC/W
Plastic DIP (N); 300 mil wide
7.11 (.280) 6.10 (.240)
8.26 (.325) 7.62 (.300) 3.68 (.145) 2.92 (.115)
1.77 (.070) 1.14 (.045)
2.54 (.100) BSC
.356 (.014) .203 (.008)
0.39 (.015) MIN. .558 (.022) .356 (.014) Some 8 and 16 lead packages may have 1/2 lead at the end of the package. All specs are the same.
REF: JEDEC MS-001
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 REF: JEDEC MS-012
0.25 (0.10) 0.10 (.004)
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) 4
Cherry Semiconductor Corporation reserves the right to make changes to the specifications without notice. Please contact Cherry Semiconductor Corporation for the latest available information.
(c) 1999 Cherry Semiconductor Corporation

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