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MB3771 Datasheet(PDF) 13 Page - Cypress Semiconductor

No. de pieza MB3771
Descripción Electrónicos  Power Supply Monitor
PDF  24 Pages
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Fabricante Electrónico  CYPRESS [Cypress Semiconductor]
Página de inicio  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

MB3771 Datasheet(HTML) 13 Page - Cypress Semiconductor

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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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