Current Monitor Path Results
The summary presents detailed insights into the current monitor path involving SBAA243, INA240, OPA320, THS4551, and ADS8914B. It covers calculations and measurements for offset error, gain error, noise levels, CMRR values, and more. The results provide a comprehensive evaluation of the monitoring system's performance under different scenarios.
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Current monitor path (SBAA243) INA240, OPA320,THS4551, ADS8914B 2/9/2017 1
Summary of Results TI Calc 0.251mV 1.64mV 0.056% 0.281% 1.311% 8.481% 0.683% 4.38% 0.062% 0.322% TI Meas 0.247mV Offset Error (typical) Offset Error (Worst Case) Gain Error (typical) Gain Error (Worst Case) Error at 50mA (Typical) Error at 50mA (Worst Case) Error at 100mA (Typical) Error at 100mA (Worst Case) Error at 10A (Typical) Error at 10A (Worst Case) 0.024% 1.093% 0.531% 0.028% 2
1 point (offset) calibration TI Calc 0.056% 0.281% 0.056% 0.281% 0.056% 0.281% TI Meas 0.220% Error at 50mA (Typical) Error at 50mA (Worst Case) Error at 100mA (Typical) Error at 100mA (Worst Case) Error at 10A (Typical) Error at 10A (Worst Case) 0.127% 0.027% 3
Summary of results continued Noise rms TI Calc 0.850%rms 0.267%rms 0.517%rms 0.167%rms 0.005%rms 0.002%rms TI Meas 0.998%rms 0.930%rms 0.493%rms 0.457%rms 0.0048%rms 0.0045%rms Noise as Error at 50mA (No Avg) Noise as Error at 50mA (10x Avg) Noise as Error at 100mA (No Avg) Noise as Error at 100mA (10x avg) Noise as Error at 10A (No avg) Noise as Error at 10A (10x avg) 4
Summary of results continued Noise pp TI Calc 5.1%pp 1.6%pp 3.1%pp 1%pp 0.032%pp 0.01%pp TI Meas 7.46%pp 6.82%pp 3.40%pp 3.035%pp 0.036%pp 0.030%pp Noise as Error at 50mA (No Avg) Noise as Error at 50mA (10x Avg) Noise as Error at 100mA (No Avg) Noise as Error at 100mA (10x avg) Noise as Error at 10A (No avg) Noise as Error at 10A (10x avg) 5
Summary of results continued CMRR Typical TI Calc -0.0% 0.9% 2.4% TI Meas 0% 0.269% 1.078% CMRR, Vcm = 12V, Iin=50mA CMRR, Vcm = 30V, Iin=50mA CMRR, Vcm = 60V, Iin=50mA CMRR, Vcm = 12V, Iin= 10A CMRR, Vcm = 30V, Iin= 10A CMRR, Vcm = 60V, Iin= 10A -0.0% 0.005% 0.012% 0% 0.00134% 0.00539% 6
Summary of results continued CMRR Worst Case TI Calc -0.0% 0.9% 2.4% TI Meas 0% 0.269% 1.078% CMRR, Vcm = 12V, Iin=50mA CMRR, Vcm = 30V, Iin=50mA CMRR, Vcm = 60V, Iin=50mA CMRR, Vcm = 12V, Iin= 10A CMRR, Vcm = 30V, Iin= 10A CMRR, Vcm = 60V, Iin= 10A -0.0% 0.005% 0.012% 0% 0.00134% 0.00539% 7
Monte Carlo Analysis C1 1n T 4.00 R5 2k R3 1k Vcm_neg R9 2.2 Voltage (V) Vocm VCC 3.99 R7 10 - Vocm + ++ - C3 10n VM1 - - + R8 10 VEE VCC R10 2.2 U2 THS4551 3.98 4.490000 4.495000 4.500000 Vin Input voltage (V) R6 2k R4 1k C2 1n T 143 129 114 100 86 Samples 72 57 43 29 14 0 3.999683 4.000153 4.000623 Values 10
TI: Gain Error Estimate Typical = Gain_Error_INA240t 0.05 % Typical % worst case/2 high grade, no typ = Gain_Error_Referencet 0.025 % Typical = Gain_Error_ADS8910Bt 0.005 % typical case from montecarlo analysis. Assuming 0.01% resistors where 0.01% is modeled as a 6 sigma error 152.91 V 1 4.000V = = Gain_Error_FDAt 100 0.004 )2 )2 )2 )2 = + + + = Total_Typ_Case ( Gain_Error_INA240t ( Gain_Error_Referencet ( Gain_Error_ADS8910Bt ( Gain_Error_FDAt 0.056 Total_Typ_Case 100 mA 0.01 Total_Typ_Case 100 50 1 A 0.01 Gain_Error_typ_50mA Worst Case = = 100 0.056 % = = Gain_Error_typ_1A 100 0.056 % 50mA 0.01 1A 0.01 % worst case = Gain_Error_INA240 0.20 % worst case high grade = Gain_Error_Reference 0.05 % worst case = Gain_Error_ADS8900B 0.03 % worst case = Gain_Error_ADS8910B 0.02 % worst case from montecarlo analysis. Assuming 0.01% resistors where 0.01% is modeled as a 6 sigma error 152.91 V 3 4V = = Gain_Error_FDA 100 0.011 = + + + = Total_Worst_Case Gain_Error_Reference Gain_Error_ADS8910B Gain_Error_FDA Gain_Error_INA240 0.281 Total_Worst_Case 100 mA 0.01 Total_Worst_Case 100 50 1 A 0.01 11 = = Gain_Error_worst_50mA 100 0.281 % = = Gain_Error_worst_1A 100 0.281 % 50mA 0.01 1A 0.01
TI: Offset Error Estimate Typical Worst Case Typical = 50 V Vos_FDA Typical = 265 V = 5 V Vos_FDA Vos_INA = 25 V = 40 V = V Vos_INA Vos1_OPA320 Vos2_OPA320 40 Typical = 150 V = 150 V Vos1_OPA320 Vos2_OPA320 10V 0.5 218 5 Typical 0.5 LSB Offset;Full-Scale Range VREFx2 = = Vos_ADC 1.907 10 V 10V 3 218 4 Offset 3 LSBs (Max); Full-Scale Range VREF=5V *2 = = Vos_ADC 1.144 10 V = = GainINA 20 GainFDA. 2 = = GainINA 20 GainFDA. 2 ( )2 ( )2 ( )2 ( )2 4 = + + + = Vos_front_end GainFDA. Vos_FDA GainINAVos_INA Vos1_OPA320 Vos2_OPA320 2.506 10 V ( ) 3 = + + + + = Vos_worst GainFDA.Vos_FDA GainINAVos_INA Vos1_OPA320 Vos2_OPA320 Vos_ADC 1.644 10 V ( )2 )2 6 = + = Vos_typ ( Vos_front_end Vos_ADC 251.324 10 V = 0.01 50mA GainINA = = 0.01 10A GainINA = Vout_50mA GainFDA. 0.02V Vout_10A GainFDA. 4V = 0.01 50mA GainINA = = 0.01 10A GainINA = Vout_50mA GainFDA. 0.02V Vout_10A GainFDA. 4V Vos_worst Vout_50mA = = %offset_Worst_Error50mA 100 8.222 % Vos_typ Vout_50mA % = = %Offset_typ_Error50mA 100 1.257 Vos_worst Vout_10A = = %offset_Worst_Error10A 100 0.041 % Vos_typ Vout_10A 3 % = = %Offset_typ_Error10A 100 6.283 10 12
TI Error vs Input Voltage Typical error Max error = 0.01 50 2 = Vin_ADC_50mA mA 20 0.02V = 0.01 50 2 = Vin_ADC_50mA mA 20 0.02V = 251 V Vos = Vos 1.64mV = Gain_Error 0.056 % = Gain_Error 0.281 % Gain_Error 100 Vin_ADC_50mA Gain_Error 100 Vin_ADC_50mA + Vos Vin_ADC_50mA + Vos Vin_ADC_50mA = = Error 100 1.311 = = Error 100 8.481 = 0.01 100 2 = Vin_ADC_100mA mA 20 0.04V = 0.01 100 2 = Vin_ADC_100mA mA 20 0.04V Gain_Error 100 Vin_ADC_100mA Gain_Error 100 Vin_ADC_100mA + Vos Vin_ADC_100mA + Vos Vin_ADC_100mA = = Error 100 0.683 = = Error 100 4.381 = 0.01 10 A 20 2 = Vin_ADC_10A 4V = 0.01 10 A 20 2 = Vin_ADC_10A 4V Gain_Error 100 Vin_ADC_10A + Vos Vin_ADC_10A Gain_Error 100 Vin_ADC_10A + Vos Vin_ADC_10A = = Error 100 0.062 = = Error 100 0.322 13
TI Error vs Input Voltage 1 point calibration Typical error Max error = 0.01 50 2 = = 0.01 50 2 = Vin_ADC_50mA mA 20 0.02V Vin_ADC_50mA mA 20 0.02V = = 0 V Vos 0V Vos = = Gain_Error 0.281 % Gain_Error 0.056 % Gain_Error 100 Vin_ADC_50mA + Gain_Error 100 Vin_ADC_50mA Vos Vin_ADC_50mA + Vos Vin_ADC_50mA = = Error 100 0.056 = = Error 100 0.281 = 0.01 100 2 = = 0.01 100 2 = Vin_ADC_100mA mA 20 0.04V Vin_ADC_100mA mA 20 0.04V Gain_Error 100 Vin_ADC_100mA Gain_Error 100 Vin_ADC_100mA + + Vos Vin_ADC_100mA Vos Vin_ADC_100mA = = = = Error 100 0.281 Error 100 0.056 = 0.01 10 A 20 2 = Vin_ADC_10A 4V = 0.01 10 A 20 2 = Vin_ADC_10A 4V Gain_Error 100 Vin_ADC_10A + Gain_Error 100 Vin_ADC_10A Vos Vin_ADC_10A + Vos Vin_ADC_10A = = Error 100 0.056 = 100 = Error 0.281 14
TI Noise INA240 Noise OPA320+THS4551 Noise Total Noise = 5V .707 = = = 10k = Vs_rms 3.535V SNR 104.5 R48 C35 1.5nF Rf1 1k Vocm R1 2.2 40nV = = enU9 GFDA 2 Vs_rms SNR U2 OPA320_gwl 6 VCC Hz Rg1 1k = = + Vn_adc 21.057 10 V U1 THS4551 C1 10n V - Vocm ++ - Vocm - 20 10 + VM1 1 1 s 104 VEE = = PD fcU9out 1.061 - 2 Rg2 1k R2 2.2 R48 C35 = 36.5 V = = Vn_opa_ina GINA 20 GFDA 2 ++ Rf2 1k = 0.01 = Rshunt Ishunt_min 50mA + V5 5 6 VG1 2.5 = = EnU9out fcU9out1.57 enU9 20 103.253 10 V 2 2 2 6 = + + = Vn_total EnU9_adc_in Vn_opa_ina Vn_adc 210.8 10 V 6 = = EnU9_adc_in EnU9outGFDA 206.507 10 V Vn_total GINAGFDA 6 = = VnRTI 5.269 10 V 40.00u T 6VnRTI 36.5uV 36.5uV = = ErrorPP 100 5.058 %pp 30.00u RshuntIshunt_min Total noise (V) RMS noise With 10x averaging 20.00u 6VnRTI = = ErrorPP 100 1.6 %pp RshuntIshunt_min 10 10.00u 0.00 1.00 10.00k 100.00M Frequency (Hz) 15
TI CMRR - Typical Typical CMRR TI = CMRR 132 Error from CMRR for a 50mA signal Error from CMRR for a 100mA signal Error from CMRR for a 10A signal = Vcm 0V Vcm 12V 6 Vos Vos Vos 0.01 10 Vos = = 3.014 10 V Error = 100 = Error = = Error = = 0.603 % 100 0.301 % 100 0.003 % CMRR 20 0.01 50 0.01 100 mA mA A 10 = Vcm 1V Vcm 12V 6 Vos Vos Vos Vos = = 2.763 10 V 3 Error = 100 = Error = = Error = = 0.553 % 100 0.276 % 100 2.763 % 10 CMRR 20 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 = Vcm 12V Vcm 12V 100 Vos Vos Vos Vos = = 0 V Error = 100 = Error = = Error = = 0 % 100 0 % 100 0 % CMRR 20 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 = Vcm 30V Vcm 12V 6 Vos = = 4.521 10 V Vos Vos Vos CMRR 20 Error = 100 = Error = = Error = = 0.904 % 100 0.452 % 100 0.005 % 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 = Vcm 60V Vcm 12V 6 Vos Vos Vos Vos = = 12.057 10 V Error = 100 = Error = = Error = = 2.411 % 100 1.206 % 100 0.012 % CMRR 20 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 16
TI - CMRR worst case WORST CASE CMRR TI = CMRR 120 Error from CMRR for a 50mA signal Error from CMRR for a 100mA signal Error from CMRR for a 10A signal = Vcm 0V Vcm 12V 5 Vos Vos Vos 0.01 10 Vos = = 1.2 10 V Error = = Error = 100 = Error = = 100 2.4 % 1.2 % 100 0.012 % CMRR 20 0.01 50 0.01 100 mA mA A 10 = Vcm 1V Vcm 12V 6 Vos Vos Vos Vos = = 11 10 V Error = = Error = 100 = Error = = 100 2.2 % 1.1 % 100 0.011 % CMRR 20 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 = Vcm 12V Vcm 12V 100 Vos Vos Vos Vos = = 0 V Error = = Error = 100 = Error = = 100 0 % 0 % 100 0 % CMRR 20 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 = Vcm 30V Vcm 12V 6 Vos = = 18 10 V Vos Vos Vos CMRR 20 Error = = Error = 100 = Error = = 100 3.6 % 1.8 % 100 0.018 % 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 = Vcm 60V Vcm 12V 6 Vos Vos Vos Vos = = 48 10 V Error = = Error = 100 = Error = = 100 9.6 % 4.8 % 100 0.048 % CMRR 20 0.01 50 0.01 100 0.01 10A mA mA ( ) 10 17
