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: [email protected] 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