S1F76620 Series

Series Connection

When S1F76620 is connected in series (VDD and VO in the previous stage are connected to GND and VDD in the next stage respectively), the output voltage can be increased more. But the series connection makes the output impedance high. Figure 3 shows an example of the series connection to get VO = 15V from VDD = 5V.

 

 

 

 

Vo=2

•

VI

 

 

 

 

Vo'=3 VI

 

 

 

 

 

 

 

 

 

 

•

 

 

 

 

 

 

 

1

POFF

VO

8

 

 

 

 

 

 

 

 

2

GND

CAP1+

7

+

1

POFF

VO

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

3

OSC1

CAP1–

6

+

2

GND

CAP1+

7

+

 

 

 

 

 

 

–

 

 

 

 

 

 

4

OSC2

VDD

5

 

VI

 

 

 

– +

 

OSC1

CAP1–

6

 

 

 

 

 

3

 

–

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

OSC2

VDD

5

 

 

 

 

 

 

 

 

Figure 3 Series Connection

VO=10V

First stage

Next stage VO'=15V

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD'

 

 

 

 

 

 

VDD(5V)

 

 

 

GND'

 

 

 

 

 

 

 

 

 

 

 

 

GND(0V)

Figure 4 Power Supply Relations in Series Connection (1)

Note

When the input voltage in the next stage is as per the specification (VDD-GND ≤ 8V) in a series connection, the output in the first stage (VO-VDD) can be used as the input in the next stage (VDD-GND). (See Figure 5.)

 

VO=4V

First stage

Next stage

VO'=8V

 

 

 

 

 

 

 

VDD'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VDD(2V)

 

 

GND'

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

GND(0V)

Figure 5 Power Supply Relations in Series Connection (2)

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S1F70000 Series Technical Manual