MB3782 Просмотр технического описания (PDF) - Fujitsu

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MB3782

Switching Regulator Controller

Fujitsu 

MB3782

s 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 (VREF/2). The method of connection

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.

VREF

R

V0 +

V0 + =

VREF

· (R1 + R2)

2·R2

R1

+

–

pin 6

R

R2

RNF

Figure 2 Error amp (channel 1) connection: Output voltage VO positive

VREF

R

R1

+

–

V0 – = –

VREF

· (R1 + R2) + VREF

2·R2

pin 6

R

R2

RNF

V0 –

Figure 3 Error amp (channel 1) connection: Output voltage VO positive

7

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