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OPA2369AIDCNT Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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OPA2369AIDCNT Datasheet(HTML) 10 Page - Burr-Brown (TI) |
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10 / 20 page  www.ti.com R = F V REF 1000(I BMAX) = 1.2V 1000(50pA) = 24M 20M W W » (1) R =R 1 F =20MW V HYST V BATT =420kW 50mV 2.4V (2) R I OPA369 V IN V OUT RF C FB C IN BATTERY MONITORING R = 2 - V THRS V BATT 1 R 1 1 ( ) - 1 R 1 = - 2V 1.2V 420kW ´ 1 420kW 1 ( ) - 1 20MW = 650kW (3) R = BIAS =0.9MW V BATTMIN I BIAS = 1.8V 2 A m (4) REF1112 OPA369 +IN OUT - IN V STATUS V BATT V REF R 1 R 2 R BIAS I BIAS R F + OPA369 OPA2369 SBOS414A – AUGUST 2007 – REVISED SEPTEMBER 2007 In unity-gain inverter configuration, phase margin can 1. Selecting RF: Select RF such that the current be reduced by the reaction between the capacitance through RF is approximately 1000x larger than at the op amp input and the gain setting resistors. the maximum bias current over temperature: Best performance is achieved by using smaller valued resistors. However, when larger valued resistors cannot be avoided, a small (4pF to 6pF) capacitor, CFB, can be inserted in the feedback, as shown in Figure 25. This configuration significantly reduces overshoot by compensating the effect of capacitance, CIN, which includes the amplifier input 2. Choose the hysteresis voltage, VHYST. For capacitance and printed circuit board (PCB) parasitic battery-monitoring applications, 50mV is capacitance. adequate. 3. Calculate R1 as follows: 4. Select a threshold voltage for VIN rising (VTHRS) = 2.0V 5. Calculate R2 as follows: Figure 25. Improving Stability for Large RF and RIN The low operating voltage and quiescent current of the OPA369 series make it an excellent choice for battery monitoring applications, as shown in 6. Calculate RBIAS: The minimum supply voltage for Figure 26. In this circuit, VSTATUS is high as long as this circuit is 1.8V. The REF1112 has a current the battery voltage remains above 2V. A low-power requirement of 1.2 μA (max). Providing the reference is used to set the trip point. Resistor values REF1112 with 2 μA of supply current assures are selected as follows: proper operation. Therefore: Figure 26. Battery Monitor 10 Submit Documentation Feedback Copyright © 2007, Texas Instruments Incorporated Product Folder Link(s): OPA369 OPA2369 |
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