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RV4141A Datasheet(PDF) 6 Page - Fairchild Semiconductor |
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RV4141A Datasheet(HTML) 6 Page - Fairchild Semiconductor |
6 / 9 page © 2003 Fairchild Semiconductor Corporation www.fairchildsemi.com RV4141A • Rev. 1.0.8 6 The SCR anode is directly connected to a solenoid or relay coil. It can be tripped only when its anode is more positive than its cathode. It must have a high dV/dt rating to ensure that line noise (generated by electrically noisy appliances) does not falsely trigger it. Also the SCR must have a gate drive requirement less than 200μA. C3 is a noise filter that prevents high-frequency line pulses from triggering the SCR. The relay solenoid should have a response time of 3ms or less to meet the UL 943 timing requirement. Sense Transformers and Cores The sense and ground/neutral transformer cores are usually fabricated using high-permeability laminated steel rings. Their single-turn primary is created by passing the line and neutral wires through the center of its core. The secondary is usually from 200 to 1500 turns. Transformers may be obtained from Magnetic Metals, Inc. (www.magmet.com). Calculating the Values of RSET and C2 Determine the nominal ground-fault trip-current requirement. This is typically 5mA in North America (117VAC) and 22mA in the UK and Europe (220VAC). Determine the minimum delay time required to prevent nuisance tripping, typically 1 to 2ms. The value of C2 required to provide the desired delay time is: t C 6 2 (2) where: C2 is in Nf and t is the desired delay time in ms. The value of RSET to meet the nominal ground fault trip current specification is: 180(t/P) COS I N 4.6 R FAULT SET (3) where: RSET is in k t is the time delay in ms; P is the period of the line frequency in ms; IFAULT is the desired ground fault trip current in mA RMS; N is the number of sense transformer secondary turns. Note: 2. This formula assumes an ideal sense transformer is used. The calculated value of RSET may have to be changed up to 30% when using a non-ideal transformer. Figure 3. GFI Application Circuit |
Similar Part No. - RV4141A_11 |
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Similar Description - RV4141A_11 |
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