Power Supply User Manual

S1F76640 Series

S1F70000 Series EPSON 2–61

Technical Manual

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 tempera-

ture gradients, –0.20%/˚C, –0.40%/˚C and –0.60%/˚C, can be selected as the V

REG output. When other temperature

gradients are necessary, a thermistor is connected in series to the resistor R

RV for output voltage regulation as shown

in Figure 8.8, and temperature gradients can be changed to any values.

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 V

REG are expressed as follows:

REG =

RV + RT

· V

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.

REG