S1F76600 Series

 

100

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

90

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

36

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

80

 

 

 

 

 

 

 

 

 

 

 

 

Πεφφ

 

 

32

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

70

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

28

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Ta = 25 °Χ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

60

 

ς Ι = ∠2.0ς

 

 

 

 

 

 

 

 

 

 

 

 

 

24

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

[%]Peff

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

I[mA]I

50

 

 

 

 

 

 

 

 

 

 

 

 

 

ΙΙ

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

40

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

16

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

30

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

12

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

20

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

8

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

4

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

0

1

2

3

4

5

6

7

 

8

9

10

 

IO [mA]

(13)Multiplication efficiency/input current vs. Output current

FUNCTIONAL DESCRIPTIONS

CR Oscillator

S1F76600 has a built-in CR oscillator as the internal os- cillator, and an external oscillation resistor ROSC is connected between the pins OSC1 and OSC2 before opera- tion.

far as the

straight portion (500kΩ < ROSC < 2MΩ) is concerned:

ROSC = A • (1/fOSC)

(A : Constant, When GND is 0V and VDD is 5V, A is approximately 2.0 × 1010 (I/F).)

So, the ROSC value can be obtained from this formula. (Recommended oscillation frequency : 10kHz to 30kHz (ROSC : 2MΩ to 680kΩ))

When the external clock operates, make the pin OSC2 open as shown below and input the 50% duty of the external clock from the pin OSC1.

OSC1

External clock

OSC2 Open

Voltage Multiplier

The voltage multiplier uses the clock signal from the oscillator to double the input voltage. This requires two external capacitors—a charge-pump capacitor, C1, between CAP1+ and CAP1–, and a smoothing capacitor, C2, between VI and VO.

S1F76600

Series

 

 

OSC1

(Note 1)

ROSC

OSC2

Note 1

Since the oscillation frequency varies with wiring ca- pacitance, make the cables between the terminals OSC1 and OSC2 and ROSC as short as possible.

When setting the external resistor ROSC, find ROSC suitable for fOSC that brings about the maximum efficiency from characteristics graph (9) and (10). The relations between ROSC and fOSC in characteristics graph (1) are expressed approximately with the following formula as

 

 

 

 

 

ς = 0 ς

 

 

 

 

 

5 V

 

 

 

 

 

 

 

 

 

 

ς Ι = ∠5 ς

 

 

 

 

 

1

8

+

 

Χ2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10∝Φ

 

2

7

 

 

 

 

 

 

 

ς Ο1 = ∠10ς (2ς Ι)

1ΜΩ

 

 

 

 

 

 

 

 

 

 

 

3

6

 

 

 

C1

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

10 ∝Φ

 

4

5

+

 

 

 

 

 

 

 

 

 

 

 

 

 

Doubled potential levels

VCC

VDD = 0 V

(+5V)

 

 

GND

 

VI = –5 V

 

 

 

(–5V)

 

VO = (2VI) = –10 V

S1F70000 Series Technical Manual

EPSON

1–7