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STK400-290 Datasheet(PDF) 4 Page - Sanyo Semicon Device

Part No. STK400-290
Description  AF Power Amplifier (Split Power Supply) (50 W 50 W 50W min, THD = 0.08%)
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Maker  SANYO [Sanyo Semicon Device]
Homepage  https://www.sanyo-av.com/us/
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STK400-290 Datasheet(HTML) 4 Page - Sanyo Semicon Device

 
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Sample Application Circuit
Description of External Circuits
No. 4822-4/10
STK400-290
For input coupling capacitor. Used for current blocking. When capacitor reactance with low frequency is increased, the reactance
C1, 11, 21
value should be reduced in order to reduce the output noise from the signal resistance dependent 1/f noise. In response to the
popping noise which occurs when the system power is turned on, C1 and C11 which determine the decay time constant on the
input side are increased while C3, C13 and C23 on the NF side are decreased.
C2, 12, 22
For input filter capacitor. Permits high-region noise reduction by utilizing filter constructed with R1, R11 and R21.
For NF capacitor. This capacitor determines the decline of the cutoff frequency and is calculated according to the following
equation.
C3, 13, 23
fL =
For the purpose of achieving voltage gains prior to reduction, it is best that C3, C13 and C23 are large. However, because the
shock noise which occurs when the system power is turned on tends to increase, values larger than those absolutely necessary
should be avoided.
C5, 15, 25
For oscillation prevention capacitor. A Mylar capacitor with temperature and frequency features is recommended.
C6, 7
For oscillation prevention capacitor. To ensure safe IC functioning, the capacitor should be installed as close as possible to the IC
power pin to reduce power impedance. An electrolytic capacitor is good.
C8, 9, 28, 29
For decoupling capacitor. Reduces shock noise during power up using decay time constant circuits with R8, R9, R28 and R29 and
eliminates components such as ripples crossing over into the input side from the power line.
R1, 11, 21
For input filter applied resistor.
R2, 12, 22
For input bias resistor. The input pin is biased to zero potential. Input impedance is mostly decided with this resistance value.
R3, 13, 23
For resistors to determine voltage gain (VG). We recommend a VG = 40 dB using R3, R13, R23 = 560
Ω and R4, R14 and R24 =
R4, 14, 24
56
Ω. VG adjustments are best performed using R3, R13 and R23. When using R4, R14 and R24 for such purposes, R4, R14 and
R24 should be set to equal R2, R12 and R22 in order to establish a stable V
N balance.
R5, 15, 25
For oscillation prevention resistor.
For oscillation prevention resistor. This resistor’s electrical output resides in the signal frequency and is calculated according to the
following formula.
R6, 16, 26
f = output signal frequency upper limit
For ripple filter applied resistor. PO max, ripple rejection and power-up shock noise are modified according to this value. Set the
R8, 9, 28, 29
electrical output of these resistors while keeping in mind the flow of peak current during recharging to C8, C9, C28 and C29 which
function as pre-drive TR control resistors during load shorts.
L1, 2, 3
For oscillation prevention coil. Compensates phase dislocation caused by load capacitors and ensures stable oscillation.
1
2
π × C3 (13, 23) × R3 (13, 23)
P R6 (16, 26) =
2
× R6 (16, 26)
1/2
π fC5 (15, 25) + R6 (16, 26)
(
)
VCC max/√2


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