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Ordering number: EN 4680B
Thick Film Hybrid IC
STK401-060 AF Power Amplifier (Split Power Supply) (35W + 35W min, THD = 0.4%)
Overview
The STK401-060 is a thick-film audio power amplifier IC belonging to a series in which all devices are pin compatible. This allows a single PCB design to be used to construct amplifiers of various output capacity simply by changing hybrid ICs. Also, this series is part of a new, larger series that comprises mutually similar devices with the same pin compatibility. This makes possible the development of a 2-channel amplifier from a 3-channel amplifier using the same PCB. In addition, this new series features 6/3 drive in order to support the low impedance of modern speakers.
Package Dimensions
unit: mm
4134
[STK401-060]
Features
* Pin compatible STK400-000 series (3-channel/single package) STK401-000 series (2-channel/single package) * Output load impedance RL = 6/3 supported * New pin configuration Pin configuration has been grouped into individual blocks of inputs, outputs and supply lines, minimizing the adverse effects of pattern layout on operating characteristics. * Few external components In comparison with existing series, external bootstrap resistors and capacitors can be eliminated.
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10997HA(ID) / 71696HA(ID) / 41495TH(ID) No. 4680--1/8
STK401-060
Specifications
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Thermal resistance Junction temperature Operating substrate temperature Storage temperature Available time for load short-circuit Symbol VCC max j-c Tj Tc Tstg ts VCC = 28V, RL = 6, f = 50Hz, PO = 35W Per power transistor Conditions Ratings 41 1.8 150 125 -30 to +125 1 Unit V C/W C C C s
Operating Characteristics at Ta = 25C, RL = 6 (noninductive load), Rg = 600, VG = 40dB
Parameter Quiescent current Symbol ICCO PO(1) Output power PO(2) THD(1) Total harmonic distortion THD(2) Frequency response Input impedance Output noise voltage Neutral voltage fL, fH ri VNO VN Conditions VCC = 34V VCC = 28V, f = 20Hz to 20kHz, THD = 0.4% VCC = 23V, f = 1kHz, THD = 1.0%, RL = 3 VCC = 28V, f = 20Hz to 20kHz, PO = 1.0W VCC = 28V, f = 1kHz, PO = 5.0W VCC = 28V, PO = 1.0W, +0 dB -3 VCC = 28V, f = 1kHz, PO = 1.0W VCC = 34V, Rg = 10k VCC = 34V min 20 35 35 - - - - - -70 typ 60 40 40 - 0.01 20 to 50k 55 - 0 max 100 - - 0.4 - - - 1.2 +70 Unit mA W W % % Hz k mVrms mV
Notes. All tests are measured using a constant-voltage supply unless otherwise specified. Available time for load short-circuit and output noise voltage are measured using the transformer supply specified below. The output noise voltage is the peak value of an average-reading meter with an rms value scale (VTVM). A regulated AC supply (50Hz) should be used to eliminate the effects of AC primary line flicker noise.
Specified Transformer Supply (RP-25 or Equivalent)
No. 4680--2/8
STK401-060
Equivalent Circuit
Sample PCB Layout for 2-Channel or 3-Channel Amplifiers
Copper (Cu) foil surface Pin 6 of STK400-000 series devices corresponds to pin 1 of STK401-000 series devices.
No. 4680--3/8
STK401-060
Sample Application Circuit
External Component Description
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. Input filter capacitors. These, together with R1 and R11, form filters to reduce high-frequency noise. NF capacitors. These determine the low-side cut-off frequency. C3, C13 1 f L = ----------------------------------------------------------------2 x C 3( C13) x R3( R 13) 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. Oscillation prevention capacitors. Mylar capacitors are recommended for their excellent thermal and frequency characteristics. 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. 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. Input filter resistors. Input bias resistors. These are used to bias the input pins at zero potential. The input impedance is largely determined by this resistance. Voltage-gain VG setting resistors. VG = 40dB is recommended using R3, R13 = 560, and R4, R14 = 56k. 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. Oscillation prevention resistors. Oscillation prevention resistors. The power dissipated in these resistors is dependent on the frequency, as given below. R6, R16
2 V CC max 2 P R6(R16) --------------------------------------------------------------------------- x R6( R16) = 1 2 f x C5( C15) + R 6( R 16)
C1, C11
C2, C12
C5, C15
C6, C7
C8, C9 R1, R11 R2, R12 R3, R13 R4, R14 R5, R15
where f is the output signal frequency upper limit. 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. Oscillation prevention coils. These correct the phase difference caused by capacitive loads and increase stability against oscillation. No. 4680--4/8
R8, R9
L1, L2
STK401-060
Series Configuration
3-channel amplifier type Nos. STK400-010 STK400-020 STK400-030 STK400-040 STK400-050 STK400-060 STK400-070 STK400-080 STK400-090 STK400-100 STK400-110 - - - Rated output 10W x 3 15W x 3 20W x 3 25W x 3 30W x 3 35W x 3 40W x 3 45W x 3 50W x 3 60W x 3 70W x 3 - - - 2-channel amplifier type Nos. STK401-010 STK401-020 STK401-030 STK401-040 STK401-050 STK401-060 STK401-070 STK401-080 STK401-090 STK401-100 STK401-110 STK401-120 STK401-130 STK401-140 Rated output 10W x 2 15W x 2 20W x 2 25W x 2 30W x 2 35W x 2 40W x 2 45W x 2 50W x 2 60W x 2 70W x 2 80W x 2 100W x 2 120W x 2 0.4 - - - 56.0 61.0 65.0 74.0 THD [%] f = 20Hz to 20kHz Supply voltage [V]1 VCC max1 - - - - - - - VCC max2 26 29 34 36 39 41 44 45 47 51 - - - - VCC1 17.5 20 23 25 26 28 30 31 32 35 38 42 45 51 VCC2 14 16 19 21 22 23 24 25 26 27 - - - -
1. VCC max1 (RL = 6), VCC max2 (RL = 3 to 6), VCC1 (RL = 6), VCC2 (RL = 3)
Sample Designs using a Common PCB
No. 4680--5/8
STK401-060
External Circuit Diagram
Heatsink Design Considerations
The heatsink thermal resistance, c-a, required to dissipate the STK401-060 device total power dissipation, Pd, is determined as follows: Condition 1: IC substrate temperature not to exceed 125C. Pd x c-a + Ta < 125C ........................................ (1) where Ta is the guaranteed maximum ambient temperature. Condition 2: Power transistor junction temperature, Tj, not to exceed 150C. Pd x c-a + Pd/N x j-c + Ta < 150C ................. (2) where N is the number of power transistors and j-c is the power transistor thermal resistance per transistor. Note that the power dissipated per transistor is the total, Pd, divided evenly among the N power transistors. Expressions (1) and (2) can be rewritten making c-a the subject. c-a < (125 - Ta)/Pd ............................................. (1) c-a < (150 - Ta)/Pd - j-c/N .............................. (2) The heatsink required must have a thermal resistance that simultaneously satisfies both expressions. The heatsink thermal resistance can be determined from (1) and (2) once the following parameters have been defined. * Supply voltage, VCC * Load resistance, RL * Guaranteed maximum ambient temperature, Ta The total device power dissipation when STK401-060 VCC = 28V and RL = 6, for a continuous sine wave signal, is a maximum of 54W, as shown in Figure 1. When estimating the power dissipation for an actual audio signal input, the rule of thumb is to select Pd corresponding to 1/10 PO max (within safe limits) for a continuous sine wave input. For example, from Figure 1, Pd = 32.4W (for 1/10 PO max = 3.5W) The STK401-060 has 4 power transistors, and the thermal resistance per transistor, j-c, is 1.8C/W. If the guaranteed maximum ambient temperature, Ta, is 50C, then the required heatsink thermal resistance, c-a, is: From expression (1): c-a < (125 - 50)/32.4 < 2.31 From expression (2): c-a < (150 - 50)/32.4 - 1.8/4 < 2.63 Therefore, to satisfy both expressions, the required heatsink must have a thermal resistance less than 2.31C/W.
No. 4680--6/8
STK401-060 Similarly, when STK401-060 VCC = 23V and RL = 3, from Figure 2: Pd = 38W (for 1/10 PO max = 3.5W) From expression (1): c-a < (125 - 50)/38 < 1.97 From expression (2): c-a < (150 - 50)/38 - 1.8/4 < 2.18
Figure 1. Pd -- PO Figure 2. Pd -- PO
Therefore, to satisfy both expressions, the required heatsink must have a thermal resistance less than 1.97C/W. This heatsink design example is based on a constant-voltage supply, and should be verified within your specific set environment.
THD -- PO
THD -- PO
PO -- VIN
PO -- f
No. 4680--7/8
STK401-060
PO -- VCC VG -- f
VG -- f
ICCO, VN -- Tc
ICCO, VN -- VCC
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No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees, jointly or severally. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
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This catalog provides information as of January, 1997. Specifications and information herein are subject to change without notice.
No. 4680--8/8

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