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 is possible using the same PCB. In addition,
this new series of ICs has a 6/3Ω 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=6Ω/3Ω supported
• New pin arrangement
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, boot-strap
capacitors and boot-strap resistors for external circuits
can be greatly reduced.
Package Dimensions
unit: mm
4134
Thick-Film Hybrid IC
N3096HA(OT)/31293YO 5-3211 No. 4341-1/9
[STK401-020]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
AF Power Amplifier (Split Power Supply)
(15 W + 15 W min, THD = 0.4%)
STK401-020
Ordering number : EN4341A
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
VCC= ±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 = 40dB, RL(non-inductive)
Internal Equivalent Circuit
Notes
• Use rated power supply for test 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. 4341-2/9
STK401-020
Parameter Symbol Conditions min typ max Unit
Quiescent current I
CCO
V
CC
± 24 V 20 60 100 mA
Output power
Po (1) V
CC
± 20 V, f = 20 to 20 kHz, THD = 0.4% 15 20 W
Po (2) V
CC
± 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 to 20 kHz, PO= 1.0 W 0.4 %
THD (2) V
CC
± 20 V, f = 1 kHz, PO= 5.0 W 0.02 %
+0
Frequency response f
L
, f
H
V
CC
± 20 V, PO= 1.0 W,
–3
dB 20 to 50 k Hz
Input impedance r
i
V
CC
± 20 V, f = 1 kHz, PO= 1.0 W 55 kΩ
Output noise voltage V
NO
V
CC
± 24 V, Rg = 10 kΩ 1.2 mVrms
Neutral voltage V
N
V
CC
± 24 V –70 0 70 mV
Page 3
Pattern Example for PCB used with either 2- or 3-channel Amplifiers.
Sample Application Circuit
Unit (resistance: Ω, capacitance: F)
With the STK401-000 series, the 6 pin corresponds to the 1 pin with respect to the
STK400-000 series.
No. 4341-3/9
STK401-020
Page 4
Description of External Circuits
No. 4341-4/9
STK401-020
C1, 11 For input coupling capacitor. Used for DC 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 and C13 on the NF side are decreased.
C2, 12 For input filter capacitor. Permits high-region noise reduction by utilizing filter constructed with R1 and R11.
C3, 13 For NF capacitor. This capacitor determines the decline of the cut-off frequency and is calculated according to the following equation.
f
L
=
1
2π X C3 (13) X R3 (13)
For the purpose of achieving voltage gains prior to reduction, it is best that C3 and C13 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 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 For decoupling capacitor. Reduces shock noise during power up using decay time constant circuits with R8 and R9 and eliminates
components such as ripples crossing over into the input side from the power line.
R1, 11 For input filter applied resistor.
R2, 12 For input bias resistor. The input pin is biased to zero potential. Input impedance is mostly decided with this resistance value.
R3, 13, 4, 14 For resistors to determine voltage gain (VG). We recommend a VG = 40 dB using R3 and R13 = 560Ω and R4 and R14 = 56Ω. VG
adjustments are best performed using R3 and R13. When using R4 and R14 for such purposes, R4 and R14 should be set to equal R2
and R12 in order to establish a stable VN balance.
R5, 15 For oscillation prevention resistor.
R6, 16 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) =
(
VCCmax/√2
)
2
× R6 (16)
1/2π fC5 (15) + R6 (16)
f = output signal frequency upper limit
R8, 9 For ripple filter applied resistor. PO 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 and C9 which function as pre-
drive TR control resistors during load shorts.
L1, 2 For oscillation prevention coil. Compensates phase dislocation caused by load capacitors and ensures stable oscillation.
Page 5
No. 4341-5/9
STK401-020
Series Configuration
Example of Set Design for Common PCB
VCCmax1 RL= 6Ω
VCCmax2 RL= 6Ω to 3Ω
V
CC
1 RL= 6Ω
V
CC
2 RL= 3Ω
VCCmax1 VCCmax2 VCC1 VCC2
STK400-010 10W X 3 STK401-010 10W X 2 ±29.0 ±27 ±18 ±14
STK400-020 15W X 3 STK401-020 15W X 2 ±30.5 ±29 ±20 ±16
STK400-030 20W X 3 STK401-030 20W X 2 ±34.5 ±34 ±23 ±19
STK400-040 25W X 3 STK401-040 25W X 2 ±40.0 ±36 ±25 ±21
STK400-050 30W X 3 STK401-050 30W X 2 ±42.0 ±39 ±26 ±22
STK400-060 35W X 3 STK401-060 35W X 2 ±45.0 ±41 ±28 ±23
STK400-070 40W X 3 STK401-070 40W X 2 0.4 ±48.0 ±44 ±30 ±24
STK400-080 45W X 3 STK401-080 45W X 2 ±50.0 ±45 ±31 ±25
STK400-090 50W X 3 STK401-090 50W X 2 ±52.5 ±47 ±32 ±26
STK400-100 60W X 3 STK401-100 60W X 2 ±55.0 ±51 ±35 ±27
STK400-110 70W X 3 STK401-110 70W X 2 ±56.0 — ±38 —
— — STK401-120 80W X 2 ±61.0 — ±42 —
— — STK401-130 100W X 2 ±65.0 — ±45 —
— — STK401-140 120W X 2 ±74.0 — ±51 —
3ch Amp
IC Name
Fixed
Standard
Output
2ch Amp
IC Name
Fixed
Standard
Output
THD [%]
f = 20 to 20kHz
Supply voltage [V]
Page 6
External Circuit Diagram
Heat Radiation Design Considerations
The radiator thermal resistance θc-a required for total substrate power dissipation Pd in the STK401-020 is determined as:
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 is the thermal resistance per power transistor chip
.
However, power transistor power consumption 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 consumption when STK401-020 VCCis ±20 V and RLis 6 Ω, for a continuous sine wave
signal, is a maximum of 27.5W (Fig. 1). In general, when this sort of continuous signal is used for estimation of power
consumption, the Pd used is 1/10th of POmax (slight variation depending on safety standard).
Pd=15.7W (1/10 POmax=during 1.5W)
No. 4341-6/9
STK401-020
Page 7
The STK401-020 has four 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:
From expression (1)' θc-a <(125–50)/15.7
<4.78
From expression (2)' θc-a <(150–50)/15.7–2.1/4
<5.84
To satisfy both, 4.78°C/W is the required radiator thermal resistance.
Figure 2 illustrates Pd - POwhen the VCCof STK401-020 is ±16V and RLis functioning at 3Ω.
Pd = 17.6W (1/10 POmax = during 1.5W)
From expression (1)' θc-a <(125–50)/17.6
<4.26
From expression (2)' θc-a <(150-50)/17.6–2.1/4
<5.16
To satisfy both, 4.26°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. 4341-7/9
STK401-020
Page 8
No. 4341-8/9
STK401-020
Page 9
No. 4341-9/9
STK401-020
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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