Page 1
Overview
Now, thick-film audio power amplifier ICs are available
with pin-compatibility to permit a single PCB to be
designed and amplifier output capacity changed simply by
installing a hybrid IC. This new series was developed
with this kind of pin-compatibility to ensure integration
between systems everywhere. With this new series of IC,
even changes from 3-channel amplifier to 2-channel
amplifiers are possible using the same PCB. In addition,
this new series of ICs has a 6/3 Ω drive in order to support
the low impedance of modern speakers.
Features
• Pin-compatible
STK400-000 series (3-channel, single package)
STK401-000 series (2-channel, single package)
• Output load impedance RL=6 Ω/3 Ω supported
• New pin assignment
To simplify input/output pattern layout and minimize
the effects of pattern layout on operational
characteristics, pin assignments are grouped into blocks
consisting of input, output and power systems.
• Few external circuits
Compared to those series used until now, capacitors and
bootstrap resistors for external circuits can be greatly
reduced.
Package Dimensions
unit : mm
4086A
Thick Film Hybrid IC
N3096 HA (OT)/D2894 TH(OT) No. 4830-1/10
[STK400-020]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
3-Channel AF Power Amplifier (Split Power Supply)
(15 W + 15 W +15 W min, THD = 0.4 %)
STK400-020
Ordering number : EN4830A
➙
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max ±29 V
Thermal resistance
θj-c Per power transistor 2.1 °C/W
Junction temperature Tj 150 °C
Operating substrate temperature Tc 125 °C
Storage temperature range Tstg –30 to +125 °C
Permissible load short time t
s
V
CC
= ±20 V, RL = 6 Ω, f = 50 Hz, PO = 15 W 1 s
Specifications
Maximum Ratings at Ta = 25°C
Page 2
Operating Characteristics at Ta = 25°C, RL= 6 Ω, Rg = 600 Ω, VG = 40 dB, RL(noninductive)
Internal Equivalent Circuit
Notes
• Use rated power supply for testing unless otherwise specified.
• When measuring permissible load short time and output noise voltage, use transformer power supply indicated below.
• Output noise voltage is represented by the peak value rms (VTVM) for mean reading. Use an AC stabilized power
supply (50 Hz) on the primary side to eliminate the effect of AC flicker noise.
No. 4830-2/10
STK400-020
Parameter Symbol Conditions min typ max Unit
Quiescent current I
CCO
VCC=± 24 V 30 90 150 mA
Output power
P
O
(1) VCC= ±20 V, f = 20 Hz to 20 kHz, THD = 0.4% 15 20 W
P
O
(2) VCC= ±16 V, f = 1 kHz, THD = 1.0%, RL= 3 Ω 15 20 W
Total harmonic distortion
THD (1) V
CC
= ±20 V, f = 20 Hz to 20 kHz, PO= 1.0 W 0.4 %
THD (2) V
CC
= ±20 V, f = 1 kHz, PO= 5.0 W 0.02 %
Frequency response f
L
, f
H
VCC= ±20 V, PO= 1.0 W, dB 20 to 50 k Hz
Input impedance r
i
VCC= ±20 V, f = 1 kHz, PO= 1.0 W 55 kΩ
Output noise voltage V
NO
VCC= ±24 V, Rg = 10 kΩ 1.2 mVrms
Neutral voltage V
N
VCC= ±24 V –70 0 +70 mV
+0
–3
Page 3
Pattern Example for PCB Used with Either 2- or 3-Channel Amplifiers
Sample Application Circuit
No. 4830-3/10
STK400-020
Page 4
No. 4830-4/10
STK400-020
Description of External Circuits
C1, 11, 21 For input coupling capacitor. Used for current blocking. When capacitor reactance with low frequency is increased, the reactance 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.
C3, 13, 23 For NF capacitor. This capacitor determines the decline of the cutoff frequency and is calculated according to the following equation.
f
L
=
1
2π X C3 (13, 23,) X R3 (13, 23)
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 = 560Ω and R4, R14 and R24 = 56Ω.
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 VN balance.
R5, 15, 25 For oscillation prevention resistor.
R6, 16, 26 For oscillation prevention resistor. This resistor’s electrical output resides in the signal frequency and is calculated according to the
following formula.
P R6 (16, 26) =
(
VCCmax/√2
)
2
× R6 (16, 26)
1/2π fC5 (15, 25) + R6 (16, 26)
f = output signal frequency upper limit
R8, 9, 28, 29 For ripple filter applied resistor. P
O
max, ripple rejection and power-up shock noise are modified according to this value. Set the
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.
R4, 14, 24
Page 5
Series Configuration
No. 4830-5/10
STK400-020
STK400-000, STK400-200 series
STK401-000, STK401-200 series (2-channel) Supply voltage (V)
(3-channel identical output)
THD THD
Fixed
THD THD
Fixed
IC name
(%)
IC name
(%)
standard IC name
(%)
IC name
(%)
standard V
CC
max1 VCCmax2 VCC1 VCC2
output output
STK400-010 STK400-210 10 W × 3 STK401-010 STK401-210 10 W × 2 — ±26.0 ±17.5 ±14.0
STK400-020 STK400-220 15 W × 3 STK401-020 STK401-220 15 W × 2 — ±29.0 ±20.0 ±16.0
STK400-030 STK400-230 20 W × 3 STK401-030 STK401-230 20 W × 2 — ±34.0 ±23.0 ±19.0
STK400-040 STK400-240 25 W × 3 STK401-040 STK401-240 25 W × 2 — ±36.0 ±25.0 ±21.0
STK400-050 STK400-250 30 W × 3 STK401-050 STK401-250 30 W × 2 — ±39.0 ±26.0 ±22.0
STK400-060 STK400-260 35 W × 3 STK401-060 STK401-260 35 W × 2 — ±41.0 ±28.0 ±23.0
STK400-070
0.4
STK400-270
0.08
40 W × 3 STK401-070
0.4
STK401-270
0.08
40 W × 2 — ±44.0 ±30.0 ±24.0
STK400-080 STK400-280 45 W × 3 STK401-080 STK401-280 45 W × 2 — ±45.0 ±31.0 ±25.0
STK400-090 STK400-290 50 W × 3 STK401-090 STK401-290 50 W × 2 — ±47.0 ±32.0 ±26.0
STK400-100 STK400-300 60 W × 3 STK401-100 STK401-300 60 W × 2 — ±51.0 ±35.0 ±27.0
STK400-110 STK400-310 70 W × 3 STK401-110 STK401-310 70 W × 2 ±56.0 — ±38.0 —
STK401-120 STK401-320 80 W × 2 ±61.0 — ±42.0 —
STK401-130 STK401-330 100 W × 2 ±65.0 — ±45.0 —
STK401-140 STK401-340 120 W × 2 ±74.0 — ±51.0 —
STK400-400, STK400-600 series
Supply voltage (V)
(3-channel differing output)
THD THD
Fixed
IC name
(%)
IC name
(%)
standard V
CC
max1 VCCmax2 VCC1 VCC2
output
STK400-450 STK400-650
C ch 30 W — ±39.0 ±26.0 ±22.0
L, R ch 15 W — ±29.0 ±20.0 ±16.0
STK400-460 STK400-660
C ch 35 W — ±41.0 ±28.0 ±23.0
L, R ch 15 W — ±29.0 ±20.0 ±16.0
STK400-470 STK400-670
C ch 40 W — ±44.0 ±30.0 ±24.0
L, R ch 20 W — ±34.0 ±23.0 ±19.0
STK400-480 STK400-680
C ch 45 W — ±45.0 ±31.0 ±25.0
L, R ch 20 W — ±34.0 ±23.0 ±19.0
STK400-490 0.4 STK400-690 0.08
C ch 50 W — ±47.0 ±32.0 ±26.0
L, R ch 25 W — ±36.0 ±25.0 ±21.0
STK400-500 STK400-700
C ch 60 W — ±51.0 ±35.0 ±27.0
L, R ch 30 W — ±39.0 ±26.0 ±22.0
STK400-510 STK400-710
C ch 70 W ±56.0 — ±38.0 —
L, R ch 35 W — ±41.0 ±28.0 ±23.0
STK400-520 STK400-720
C ch 80 W ±61.0 — ±42.0 —
L, R ch 40 W — ±44.0 ±30.0 ±24.0
STK400-530 STK400-730
C ch 100 W ±65.0 — ±45.0 —
L, R ch 50 W — ±47.0 ±32.0 ±26.0
VCCmax1 RL= 6 Ω
VCCmax2 RL= 6 Ω to 3 Ω operation
VCC1 RL= 6 Ω operation
VCC2 RL= 3 Ω operation
Page 6
Example of Set Design for Common PCB
No. 4830-6/10
STK400-020
Page 7
External Circuit Diagram
No. 4830-7/10
STK400-020
Heat Radiation Design Considerations
The radiator thermal resistance θc-a required for total substrate power dissipation Pd in the STK400-020 is determined as
follows:
Condition 1: IC substrate temperature Tc not to exceed 125°C.
Pd x θc-a+Ta <125°C ······························· (1)
where Ta is set assured ambient temperature.
Condition 2: Power transistor junction temperature Tj not to exceed 150°C.
Pd x θc-a+Pd/N x θj-c+Ta<150°C·············(2)
where N is the number of power transistors and θj-c the thermal resistance per power transistor chip
.
However, power transistor power dissipation is Pd equally divided by N units.
Expressions (1) and (2) can be rewritten based on θc-a to yield:
θc-a<(125–Ta)/Pd······································(1)'
θc-a<(150–Ta)/Pd–θj-c/N··························(2)'
The required radiator thermal resistance will satisfy both of these expressions.
From expressions (1)' and (2)', the required radiator thermal resistance can be determined once the following
specifications are known:
• Supply voltage V
CC
• Load resistance R
L
• Assured ambient temperature Ta
The total substrate power dissipation when STK400-020 VCCis ±20 V and RLis 6 Ω, for a continuous sine wave signal,
is a maximum of 41 W (Fig. 1). In general, when this sort of continuous signal is used for estimation of power
dissipation, the Pd used is 1/10th of POmax (slight variation depending on safety standard).
Pd=23.5 W (1/10 POmax=during 1.5 W)
Page 8
The STK400-020 has six power transistors, so the thermal resistance per transistor θj-c is 2.1°C / W. With an assured
ambient temperature Ta of 50°C, the required radiator thermal resistance θc-a would be as follows:
From expression (1)' θc-a < (125–50)/23.5
< 3.19
From expression (2)' θc-a < (150–50)/23.5 – 2.1/6
< 5.84
To satisfy both, 3.19°C/W is the required radiator thermal resistance.
Figure 2 illustrates Pd - POwhen the VCCof STK400-020 is ±16 V and RLis functioning at 3 Ω.
Pd = 26.5 W (1/10 POmax = during 1.5 W)
From expression (1)' θc-a < (125–50) – 26.5
< 2.83
From expression (2)' θc-a < (150-50)/26.5 – 2.1/6
< 3.42
To satisfy both, 2.83°C / W is the required radiator thermal resistance. This design example is based on a fixed voltage
supply, and will require verification within your specific set environment.
No. 4830-8/10
STK400-020
Page 9
No. 4830-9/10
STK400-020
Page 10
No. 4830-10/10
STK400-020
This catalog provides information as of August, 1997. Specifications and information herein are subject to
change without notice.
■ 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:
➀ 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:
➁ 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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