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OPA2369 Datasheet(PDF) 10 Page - Texas Instruments |
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OPA2369 Datasheet(HTML) 10 Page - Texas Instruments |
10 / 20 page BATTERY MONITORING R =R 1 F =20MW V HYST V BATT =420kW 50mV 2.4V (2) R = 2 - V THRS V 1 REF R ´ 1 R 1 1 ( ) - 1 R F = - 2V 1.2V 420kW ´ 1 420kW 1 ( ) - 1 20MW = 650kW (3) R = F V REF 1000(I BMAX) = 1.2V 1000(50pA) = 24M 20M W W » (1) R = BIAS =0.3MW (V BATTMIN - V ) REF I BIAS = ( 1.2V) - 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 SBOS414B – AUGUST 2007 – REVISED DECEMBER 2008 ............................................................................................................................................ www.ti.com The low operating voltage and quiescent current of the OPA369 series make it an excellent choice for 4. Select a threshold voltage for VIN rising (VTHRS) = battery monitoring applications, as shown in 2.0V Figure 25. In this circuit, VSTATUS is high as long as 5. Calculate R2 as follows: 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: 6. Calculate RBIAS: The minimum supply voltage for this circuit is 1.8V. The REF1112 has a current requirement of 1.2 µA (max). Providing the 2. Choose the hysteresis voltage, VHYST. For REF1112 with 2 µA of supply current assures battery-monitoring applications, 50mV is proper operation. Therefore: adequate. 3. Calculate R1 as follows: Figure 25. Battery Monitor 10 Submit Documentation Feedback Copyright © 2007–2008, Texas Instruments Incorporated Product Folder Link(s): OPA369 OPA2369 |
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