MB3771 Datasheet: Bipolar Power Supply Monitor - Fujitsu
MB3771 Datasheet: Bipolar Power Supply Monitor - Fujitsu
MB3771 Datasheet: Bipolar Power Supply Monitor - Fujitsu
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<strong>MB3771</strong>(2) 5 V Reference Voltage Generation and 5V <strong>Monitor</strong>ing (No.1)Detection Voltage = 4.2 VIn the above examples, the output voltage and the detection voltage are determined by the following equations:Output Voltage = (R3 + R4) × VSC/R415 VR5 : 3 kΩ<strong>MB3771</strong>0.47 µFCT12348765R3 : 3.6 kΩRESET5 V(≅ 50 mA)R4 : 1.2 kΩ(3) 5 V Reference Voltage Generation and 5 V <strong>Monitor</strong>ing (No. 2)The value of R1 should be calculated from the current consumption of the <strong>MB3771</strong>, the current flowing at R2 andR3, and the 5 V output current. The table below provides sample resistance values for reference.VCC (V) R1 (kΩ) Output Current (mA)40 11 < 1.624 6.2 < 1.415 4.7 < 0.6VCCR118RESET27GNDCTR2 :100 kΩR3 : 33 kΩ34650.47 µF5 V(4) 1.245 V Reference Voltage Generation and 5 V <strong>Monitor</strong>ingResistor R1 determines Reference current. Using 1.2 kΩ as R1, reference current is about 2 mA.VCC(5 V)R1 : 10 kΩ18RESET27GNDCT0.47 µF3465Reference Voltage1.245 V Typ12
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