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MB3771 Datasheet(PDF) 13 Page - Cypress Semiconductor |
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MB3771 Datasheet(HTML) 13 Page - Cypress Semiconductor |
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13 / 24 page ![]() MB3771 Document Number: 002-08511 Rev. *A Page 13 of 24 8.10.2 5 V Reference Voltage Generation and 5V Monitoring (No.1) Detection Voltage = 4.2 V In the above examples, the output voltage and the detection voltage are determined by the following equations: Output Voltage = (R3 + R4) VSC/R4 8.10.3 5 V Reference Voltage Generation and 5 V Monitoring (No. 2) The value of R1 should be calculated from the current consumption of the MB3771, the current flowing at R2 and R3, and the 5 V output current. The table below provides sample resistance values for reference. 8.10.4 1.245 V Reference Voltage Generation and 5 V Monitoring Resistor R1 determines Reference current. Using 1.2 k as R1, reference current is about 2 mA. VCC (V) R1 (kΩ) Output Current (mA) 40 11 < 1.6 24 6.2 < 1.4 15 4.7 < 0.6 CT MB3771 1 2 3 4 8 7 6 5 RESET 0.47 μF R5 : 3 k Ω R3 : 3.6 k Ω R4 : 1.2 k Ω 15 V 5 V( ≅ 50 mA) CT 1 2 3 4 8 7 6 5 RESET VCC 0.47 μF R3 : 33 k Ω R1 R2 : 100 k Ω 5 V GND CT 1 2 3 4 8 7 6 5 RESET VCC (5 V) 0.47 μF R1 : 10 k Ω GND Reference Voltage 1.245 V Typ |
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