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OPA2379AIDG4 Datasheet(PDF) 8 Page - Burr-Brown (TI) |
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OPA2379AIDG4 Datasheet(HTML) 8 Page - Burr-Brown (TI) |
8 / 12 page OPA379 OPA2379 OPA4379 SBOS347A − NOVEMBER 2005 − REVISED DECEMBER 2005 www.ti.com 8 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, thus degrading capacitive load drive. 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 3. This configuration significantly reduces overshoot by compensating the effect of capacitance, CIN, which includes the amplifier input capacitance and PC board parasitic capacitance. R I OPA379 V IN V OUT R F C FB C IN C L Figure 3. Improving Capacitive Load Drive BATTERY MONITORING The low operating voltage and quiescent current of the OPA379 series make it an excellent choice for battery monitoring applications, as shown in Figure 4. In this circuit, VSTATUS will be high as long as the battery voltage remains above 2V. A low-power reference is used to set the trip point. Resistor values are selected as follows: 1. Selecting RF: Select RF such that the current through RF is approximately 1000x larger than the maximum bias current over temperature: R F + V REF 1000 I BMAX + 1.2V 1000(100pA) + 12MW [ 10MW 2. Choose the hysteresis voltage, VHYST. For battery- monitoring applications, 50mV is adequate. 3. Calculate R1 as follows: R 1 + RF V HYST V BATT + 10MW 50mV 2.4V + 210kW 4. Select a threshold voltage for VIN rising (VTHRS) = 2.0V 5. Calculate R2 as follows: R 2 + 1 V THRS V REF R 1 * 1 R 1 * 1 R F + 1 2V 1.2V 210k W * 1 210k W * 1 10M W + 325kW 6. Calculate RBIAS: The minimum supply voltage for this circuit will be 1.8V. The REF1112 has a current requirement of 1.2 µA (max). Providing it 2µA of supply current assures proper operation. Therefore: R BIAS + V BATTMIN I BIAS + 1.8V 2 mA + 0.9MW REF1112 OPA379 +IN OUT −IN V STATUS V BATT V REF R 1 R 2 R BIAS I BIAS R F + Figure 4. Battery Monitor (1) (2) (3) (4) |
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