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OPA2379AIDCNT Datasheet(PDF) 10 Page - Texas Instruments |
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OPA2379AIDCNT Datasheet(HTML) 10 Page - Texas Instruments |
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10 / 29 page  R = F V REF 1000(I ) BMAX = 1.2V 1000(100pA) =12M 10M » W W (1) R =R 1 F V HYST V BATT =10MW 50mW 2.4V =210kW (2) R IN OPA379 V IN V OUT R F C FB C IN BATTERY MONITORING R = 2 1 - V THRS V R ´ REF 1 1 R 1 - 1 R F = 1 - 2V 1.2V ´ 210kW 1 210kW - 1 10MW =325kW (3) R = BIAS (V V ) - REF BATTMIN I BIAS = (1.8V 1.2V) - 2 A m =0.3MW (4) REF1112 OPA379 +IN OUT - IN V STATUS V BATT V REF R 1 R 2 R BIAS I BIAS R F + OPA379 OPA2379 OPA4379 SBOS347D – NOVEMBER 2005 – REVISED MAY 2008 ................................................................................................................................................... www.ti.com In unity-gain inverter configuration, phase margin can be reduced by the reaction between the capacitance at the op amp input and the gain setting resistors. Best performance is achieved by using smaller valued resistors. However, when large valued resistors cannot be avoided, a small (4pF to 6pF) capacitor, CFB, can be inserted in the feedback, as shown in Figure 22. This configuration significantly 2. Choose the hysteresis voltage, VHYST. For battery reduces overshoot by compensating the effect of monitoring applications, 50mV is adequate. capacitance, CIN, which includes the amplifier input 3. Calculate R1 as follows: capacitance (3pf) and printed circuit board (PC) parasitic capacitance. 4. Select a threshold voltage for VIN rising (VTHRS) = 2.0V 5. Calculate R2 as follows: Figure 22. Improving Stability for Large RF and RIN The low operating voltage and quiescent current of 6. Calculate RBIAS: The minimum supply voltage for the OPA379 series make it an excellent choice for this circuit is 1.8V. The REF1112 has a current battery monitoring applications, as shown in requirement of 1.2 µA (max). Providing 2µA of Figure 23. In this circuit, VSTATUS is high as long as supply current assures proper operation. the battery voltage remains above 2V. A low-power Therefore: reference is used to set the trip point. Resistor values are selected as follows: 1. RF Selecting: Select RF such that the current through RF is approximately 1000x larger than the maximum bias current over temperature: Figure 23. Battery Monitor 10 Submit Documentation Feedback Copyright © 2005–2008, Texas Instruments Incorporated Product Folder Link(s): OPA379 OPA2379 OPA4379 |
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