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ADM12914-1ARQZ-RL7 Folha de dados(PDF) 11 Page - Analog Devices |
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ADM12914-1ARQZ-RL7 Folha de dados(HTML) 11 Page - Analog Devices |
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11 / 16 page  ADM12914 Rev. 0 | Page 11 of 16 tolerances, must fit within a monitor region of just 0.024 V. The ADM12914 device with 0.1% resistors can achieve this level of accuracy. 1.05V 1.026V 1V CORE VOLTAGE 0.974V 0.95V UV VOLTAGE TIME 2.4% RANGE FOR OV MONITORING 2.4% RANGE FOR UV MONITORING +2.6% SUPPLY REGULATION –2.6% SUPPLY REGULATION tUOTO Figure 19. Monitoring Accuracy Example VOLTAGE MONITORING EXAMPLE To illustrate how the ADM12914 device works in a real-world application, consider the 1 V input example shown in Figure 19, with the addition of a −5 V rail. The first step is to choose the current flow through both voltage divider circuits, for example, 5 μA. For the 1 V ± 5% input, due to the specified ±2.6% regulation of the supply, the UV and OV threshold should be set in the middle of the undervoltage and overvoltage monitoring bands, respec- tively; in this case, on the ±3.8% points of the supply, which are 0.962 V for the UV threshold and 1.038 V for OV threshold. Input these values into Equation 1 to Equation 3 as follows: kΩ 5 . 96 ) 10 5 )( 038 . 1 ( ) 1 )( 5 . 0 ( 6 ≈ × = − Z R (1) Insert the value of RZ into Equation 2. Ω k 7.41 kΩ 5 . 96 ) 10 5 )( 962 . 0 ( ) 1 )( 5 . 0 ( 6 ≈ − × = − Y R (2) Then substitute the calculated values for RZ and RY into Equation 3. kΩ 5 . 96 Ω k 7.41 kΩ 5 . 96 10 5 1 6 ≈ − − × = − X R (3) This design approach meets the application specifications. As described previously, the 1 V rail is specified with an input requirement of ±5% and a supply tolerance of ±2.6%. This effectively means the OV threshold of the monitoring device, including all the tolerance factors, must fit within the 1.026 V to 1.05 V range. Similarly, the UV threshold range must be between 0.95 V and 0.974 V. The four worst-case scenarios of minimum and maximum undervoltage and overvoltage thresholds are calculated as follows: Minimum overvoltage threshold ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + − + − + − = %) 1 . 0 ( %) 1 . 0 ( %) 1 . 0 ( 1 %) 8 . 0 5 . 0 ( _ Z Y X MIN OV R R R V V ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + + = ) 001 . 1 )( 500 , 96 ( ) 999 . 0 )( 7410 500 , 96 ( 1 496 . 0 =1.029 V > 1.026 V Maximum overvoltage threshold ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + + + + + = %) 1 . 0 ( %) 1 . 0 ( %) 1 . 0 ( 1 %) 8 . 0 5 . 0 ( _ Z Y X MAX OV R R R V V = 1.047 V < 1.05 V The maximum and minimum overvoltage threshold values reside within the 1.026 V to 1.05 V range specified. The minimum and maximum undervoltage thresholds are calculated as follows: Minimum undervoltage threshold ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ + + + − + − = %) 1 . 0 ( %) 1 . 0 ( %) 1 . 0 ( 1 %) 8 . 0 V 5 . 0 ( _ Z Y X MIN UV R R R V = 0.9557 V > 0.95 V Maximum undervoltage threshold ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ − + − + + + = %) 1 . 0 ( %) 1 . 0 ( %) 1 . 0 ( 1 %) 8 . 0 V 5 . 0 ( _ Z Y X MAX UV R R R V = 0.9729 V < 0.974 V These values fit within the specified undervoltage monitoring range. All four worst-case scenarios satisfy the tolerance requirement; therefore, the design approach is valid. ADM12914 VH1 VCC 5V 1V RAIL GND VL1 VL3 VH3 REF UV SEL OV –5V RAIL 1.09MΩ 14.3kΩ 93.1kΩ 96.5kΩ 7.41kΩ 96.5kΩ Figure 20. Positive and Negative Supply Monitor Example |
Nº de peça semelhante - ADM12914-1ARQZ-RL7 |
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Descrição semelhante - ADM12914-1ARQZ-RL7 |
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