S1F76640 Series

Example of Temperature Gradient Change by External Temperature Sensor (Ther- mistor)

S1F76640 has a temperature gradient selection circuit inside the stabilization circuit, and three kinds of temperature gradients, –0.20%/˚C, –0.40%/˚C and –0.60%/˚C, can be selected as theREGVoutput. When other temperature gradients are necessary, a thermistor is connected in series to the resistor RRV for output voltage regulation as shown in Figure 8.8, and temperature gradients can be changed to any values.

 

1

RV

16

VREG

2

VREG

15

RT

3

 

14

 

RP

 

 

 

4

 

13

 

5

 

12

R1

6

VSS

11

RRV

7

 

10

 

 

 

8

 

9

Figure 8.8 Example of Temperature Gradient Change

(Pins other than the above Pins 1, 2 and 6 are connected as per Figure 5.2. For Pins 3 and 4, smaller temperature gradients than those to be changed are selected from Table 4.1 and are set.)

Note 1 : Relations among the thermistor, RT and VREG are expressed as follows:

VREG = RRV + RT · RV

R1

When a thermistor is used for RT, it can make the temperature gradient of VREG larger..

Note 2 : The thermistor temperature characteristics are non-linear but can be corrected to linear ones when the resistor RP is connected to the thermistor in parallel.

S1F76640

Series

 

 

S1F70000 Series Technical Manual

EPSON

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