Manual

BA3131FS

Standard ICs

Operation notes

(1) Pin 13 is the reference output pin, from which 1 / 2 Vcc is output. The value for the bypass capacitor should be

determined based on the desired characteristics. A value between 500pF and 1

F may produce oscillation, so if AC

grounding is being used, always use a bypass capacitor with a value of at least 10

Also, Pin 12 is designated for reference circuit input, so if reference output is being used, always use a bypass capacitor

for AC grounding. (We recommend a bypass capacitor with a value of 22

F.)

•

Reference data (these values are intended only as a reference, and performance is not guaranteed)

10 – 35 150

22 – 42 300

47 – 48 550

Ripple rejection ratio (f

= 100 Hz) (dB)Pin 12 bypass capacitor (µF) Output rise time (ms)

∗

Test conditions: When power supply is on (V

= 8V), time equal to 90% of V

bypass capacitor,Pin 13 bypass

capacitor 100µF, output smoothing voltage.

(2) This IC offers stability even at low gain (0 to 20dB), but a capacitance load of 200pF or higher may cause oscillation

(the phase margin at a capacitance of 200pF is 10

typ. (Ta = 85

C, 0dB point) ). Consequently, please make sure

sufficient care is taken in terms of the capacitance load.

When using a 0dB buffer, as shown in the application example (Figure 13), introducing a bias resistance of several k

Ω

the negative input (R11 and R12 in Figure 13, indicated as circled items) results in greater stability in terms of the

capacitance load.

Truth value table

Corresponds to

µCOM output

ch1

Conditions

∗

“H” when the applied voltage at pins 8 and 9 is 2.0V or more, and “L” when it is 1.0V or less.

SW1 (8pin)

SW2 (9pin)

ch2

ch3

OFF