MB3782 Fujitsu Media Devices, MB3782 Datasheet - Page 8

• Manufacturer Part Number: MB3782
• Description: Switching Regulator Controller
• Manufacturer: Fujitsu Media Devices

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SETTING OUTPUT VOLTAGE
The following diagrams show the connections used to set the output voltage.
Because the power supply to the error amps is provided by the same reference voltage circuit used for the other
internal circuits, the common-mode input voltage range is set at 1.05 V to 1.45 V.
The reference voltage input to the +IN and -IN pins should be set at 1.25 V (V
for channel 1 is different from channel 2 and channel 3. In addition, channel 1 is capable of picking up both
positive and negative voltages, while channel 2 and channel 3 can pick up only positive output voltages.
Figure 1
Figure 2
Error amp (channel 1) connection: Output voltage V
Error amp (channel 1) connection: Output voltage V
V
V
REF
REF
R
R
R
R
R
R
R
R
1
2
1
2
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V
0 –
+
–
+
–
R
R
NF
NF
V
0 +
V
V
0 –
0 +
= –
=
V
2·R
V
2·R
REF
REF
pin 6
pin 6
2
2
· (R1 + R2)
· (R1 + R2) + V
REF
/2). The method of connection
O
O
REF
positive
positive