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## NCV1124 Datasheet(PDF) 6 Page - ON Semiconductor

 Part No. NCV1124 Description Dual Variable−Reluctance Sensor Interface IC Download 8 Pages Scroll/Zoom 100% Maker ONSEMI [ON Semiconductor] Homepage http://www.onsemi.com Logo

## NCV1124 Datasheet(HTML) 6 Page - ON Semiconductor

 6 / 8 page NCV1124http://onsemi.com6APPLICATION INFORMATIONReferring to Figure 2, the following will be a designexample given these system requirements:RRS + 1.5 kW (u 12 kW is considered open)VRS(MAX) + 120 VpkVRS(MIN) + 250 mVpkFVRS + 10 kHz @ VRS(MIN) + 40 Vpk−pk1. Determine tradeoff between R1 value and powerrating. (use 1/2 watt package)PD +12022R1t 1 2WSet R1 = 15 k. (The clamp current will then be 120/15 k= 8.0 mA, which is less than the 12 mA limit.)2. Determine RAdjSet RAdj as close to R1 + RRS as possible.Therefore, RAdj = 17 k.3. Determine VRS(+TRP) using equation (7).VRS(+TRP) + 11mA17 k* 11mA(15 k ) 1.5 k) ) 160 mVRS(+TRP) + 166 mV typical(easily meets 250 mV minimum)4. Calculate worst case VRS(+TRP)Examination of equation (7) and the spec reveals the worstcase trip voltage will occur when:VHYS = 180 mVINAdj = 16 mAINP1 = 15mAR1 = 14.25 k (5% low)RAdj = 17.85 k (5% High)VRS(+)MAX + 16 mA(17.85 k)* 15mA(14.25 k ) 1.5 k) ) 180 mV+ 229 mVwhich is still less than the 250 mV minimum amplitude ofthe input.5. Calculate C1 for low pass filteringSince the sensor guarantees 40 Vpk−pk @ 10 kHz, a lowpass filter using R1 and C1 can be used to eliminate highfrequency noise without affecting system performance.Gain Reduction+ 0.29 V20 V+ 0.0145 +*36.7 dBTherefore, a cut−off frequency, fC, of 145 Hz could beused.C1v12pfCR1v 0.07 mFSet C1 = 0.047mF.6. Calculate the minimum RRS that will be indicated asan open circuit. (DIAG = 5.0 V)Rearranging equation (7) givesRRS +VHYS ) [INP1KIRAdj]* VRS(+TRP)INP1* R1But, VRS = 0 during this test, so it drops out.Using the following as worst case Low and High:Worst Case Low (RRS)Worst Case High (RRS)INAdj23.6mA = 15 mA × 1.5710.7mA = 7.0 mA × 1.53RAdj16.15 k17.85 kVHYS135 mV185 mVINP116mA6.0mAR115.75 k14.25 kKI1.571.53RRS +135 mV) 23.6 mA16.15 k16mA* 15.75 k+ 16.5 kTherefore,RRS(MIN) + 16.5 k (meets 12 k system spec)and,RRS(MAX) +185 mV) 10.7 mA17.85 k6.0mA* 14.25 k+ 48.4 k

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