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BA3131FS Datenblatt(PDF) 8 Page - Rohm |
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BA3131FS Datenblatt(HTML) 8 Page - Rohm |
8 / 9 page 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 µF may produce oscillation, so if AC grounding is being used, always use a bypass capacitor with a value of at least 10 µF. 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 µF.) •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 (fIN = 100 Hz) (dB) Pin 12 bypass capacitor ( µF) Output rise time (ms)∗ ∗ Test conditions: When power supply is on (VCC = 8V), time equal to 90% of VCC bypass capacitor,Pin 13 bypass capacitor 100 µF, 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 to 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 H H 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) H L ch2 L H ch3 L L OFF |
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