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STK401-040 数据表(PDF) 4 Page - Sanyo Semicon Device |
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STK401-040 数据表(HTML) 4 Page - Sanyo Semicon Device |
4 / 8 page STK401-060 No. 4680—4/8 Sample Application Circuit External Component Description C1, C11 Input coupling capacitors. For DC blocking. Since capacitor reactance becomes larger at lower frequencies, the output noise can be adversely affected by signal source resistance-dependent 1/f noise. In this case, a lower reactance value should be chosen. In order to remove pop noise at power-on, larger values of capacitance should be chosen for C1 and C11, which determine the input time constant, and smaller values for C3 and C13 in the NF circuit. C2, C12 Input filter capacitors. These, together with R1 and R11, form filters to reduce high-frequency noise. C3, C13 NF capacitors. These determine the low-side cut-off frequency. Large values should be chosen for C3 and C13 to maintain voltage gain at low frequencies. However, because this would tend to increase the shock noise at power-on, values larger than absolutely necessary should be avoided. C5, C15 Oscillation prevention capacitors. Mylar capacitors are recommended for their excellent thermal and frequency characteristics. C6, C7 Oscillation prevention capacitors. These should be inserted as close as possible to the IC supply pins to reduce supply impedance and hence provide stable IC operation. Electrolytic capacitors are recommended. C8, C9 Decoupling capacitors. These, together with R8 and R9, form time constant circuits that remove shock noise and ripple voltage from the supply, preventing any noise being coupled to the inputs. R1, R11 Input filter resistors. R2, R12 Input bias resistors. These are used to bias the input pins at zero potential. The input impedance is largely determined by this resistance. R3, R13 R4, R14 Voltage-gain VG setting resistors. VG = 40dB is recommended using R3, R13 = 560 Ω, and R4, R14 = 56kΩ. Gain adjustments are best made using R3 and R13. If gain adjustments are made using R4 and R14, then set R2, R12 = R4, R14 to maintain VN balance stability. R5, R15 Oscillation prevention resistors. R6, R16 Oscillation prevention resistors. The power dissipated in these resistors is dependent on the frequency, as given below. where f is the output signal frequency upper limit. R8, R9 Ripple filter resistors. PO max, ripple rejection and supply power-on shock noise are all affected by this resistance. These resistors should be chosen taking into consideration both the function they perform as predriver transistor limiting resistors during load short circuits and the peak current that flows through them when charging C8 and C9. L1, L2 Oscillation prevention coils. These correct the phase difference caused by capacitive loads and increase stability against oscillation. f L 1 2 π C 3 C13 () R3 R13 () × × ----------------------------------------------------------------- = P R6(R16) V CC max 2 ⁄ 12 πf ⁄ C5 C15 () × R 6 R 16 () + --------------------------------------------------------------------------- 2 R6 × R16 () = |
类似零件编号 - STK401-040 |
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类似说明 - STK401-040 |
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