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CS1124YD8G датащи(PDF) 6 Page - ON Semiconductor |
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CS1124YD8G датащи(HTML) 6 Page - ON Semiconductor |
6 / 8 page CS1124 http://onsemi.com 6 APPLICATION INFORMATION Referring to Figure 2, the following will be a design example given these system requirements: RRS + 1.5 kW (u 12 kW is considered open) VRS(MAX) + 120 Vpk VRS(MIN) + 250 mVpk FVRS + 10 kHz @ VRS(MIN) + 40 Vpk−pk 1. Determine tradeoff between R1 value and power rating. (use 1/2 watt package) PD + 120 2 2 R1 t 1 2W Set 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 RAdj Set RAdj as close to R1 + RRS as possible. Therefore, RAdj = 17 k. 3. Determine VRS(+TRP) using equation (7). VRS(+TRP) + 11mA 17 k * 11mA(15 k ) 1.5 k) ) 160 m VRS(+TRP) + 166 mV typical (easily meets 250 mV minimum) 4. Calculate worst case VRS(+TRP) Examination of equation (7) and the spec reveals the worst case trip voltage will occur when: VHYS = 180 mV INAdj = 16 mA INP1 = 15 mA R1 = 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 mV which is still less than the 250 mV minimum amplitude of the input. 5. Calculate C1 for low pass filtering Since the sensor guarantees 40 Vpk−pk @ 10 kHz, a low pass filter using R1 and C1 can be used to eliminate high frequency noise without affecting system performance. Gain Reduction + 0.29 V 20 V + 0.0145 +*36.7 dB Therefore, a cut−off frequency, fC, of 145 Hz could be used. C1 v 1 2 pfCR1 v 0.07 mF Set C1 = 0.047 mF. 6. Calculate the minimum RRS that will be indicated as an open circuit. (DIAG = 5.0 V) Rearranging equation (7) gives RRS + VHYS ) [INP1 KI RAdj] * VRS(+TRP) INP1 * R1 But, 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) INAdj 23.6 mA = 15 mA × 1.57 10.7 mA = 7.0 mA × 1.53 RAdj 16.15 k 17.85 k VHYS 135 mV 185 mV INP1 16 mA 6.0 mA R1 15.75 k 14.25 k KI 1.57 1.53 RRS + 135 mV ) 23.6 mA 16.15 k 16 mA * 15.75 k + 16.5 k Therefore, RRS(MIN) + 16.5 k (meets 12 k system spec) and, RRS(MAX) + 185 mV ) 10.7 mA 17.85 k 6.0 mA * 14.25 k + 48.4 k |
Аналогичный номер детали - CS1124YD8G |
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Аналогичное описание - CS1124YD8G |
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