Page 1
Ordering number: 2136B
±
θ
°
°
°
−
°
±
8
Thick Film Hybrid IC
STK4171 V
AF Power Amplifier (Split Power Supply)
(40W + 40W min, THD = 0.08%)
Features
• Pin-compatible with the STK4102II series. The
STK4101V series use the same package and are available for output 15W to 50W.
Package Dimensions
unit: mm
4040
[STK4171 V ]
• Built-in muting circuit to cut off various kinds of pop
noise
• Greatly reduced heat sink due to substrate temperature
125 ° C guaranteed
• Distortion 0.08% due to current mirror circuit
• Excellent cost performance
Specifications
Maximum Ratings
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Thermal resistance
Junction temperature Tj 150
Operating substrate temperature Tc 125
Storage temperature Tstg
Available time for load short-circuit t
at Ta = 25 ° C
max
CC
j-c 1.8
30 to +125
*1 V
s
= ± 32.5V, R
CC
= 8 Ω , f = 50Hz, Po = 40W 2 s
L
49 V
C/W
C
C
C
Recommended Operating Conditions
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Load resistance R
CC
L
SANYO Electric Co., Ltd. Semiconductor Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
at Ta = 25 ° C
32.5 V
Ω
70997HA (ID) / 8308TA No. 2136—1/8
Page 2
STK4171 V
Operating Characteristics
at Ta = 25 ° C, V
R
: non-inductive load
L
= ± 32.5V, R
CC
Parameter Symbol Conditions min typ max Unit
Quiescent current I
P
CCO
(1)
O
Output power
(2)
P
O
Total harmonic distortion THD P
Frequency response f
Input impedance r
Output noise voltage V
Neutral voltage V
Muting voltage V
, f
L
H
i
*2 V
NO
N
M
V
= ± 39V 20 40 100 mA
CC
THD = 0.08%,
f = 20Hz to 20kHz
V
= ± 28V, THD = 1.0%,
CC
R
= 4 Ω , f = 1kHz
L
= 1.0W, f = 1kHz 0.08 %
O
P
O
P
O
CC
V
CC
+0
= 1.0W, dB 20 to 50k Hz
–3
= 1.0W, f = 1kHz 55 k Ω
= ± 39V, Rg = 10k Ω
= ± 39V –70 0 +70 mV
Notes. For power supply at the time of test, use a constant-voltage po w er supply
unless otherwise specified.
*1 For measurement of the available time for load short-circuit and output
noise voltage, use the specified transformer power supply shown right.
*2 The output noise voltage is represented by the peak value on rms scale
(VTVM) of average value indicating type. For AC power supply, use an
AC stabilized power supply (50Hz) to eliminate the effect of flicker noise
in AC primary line.
= 8 Ω , VG = 40dB, Rg = 600 Ω ,
L
40 W
45 W
–2 –5 –10 V
Specified Transformer Power Supply
(Equivalent to MG-200)
1.2 mVrms
Equivalent Circuit
No. 2136—2/8
Page 3
Sample Application Circuit
STK4171 V
Sample Printed Circuit Pattern for Application Circuit
(Cu-foiled side)
- W
Output power, P
O
Total harmonic distortion, THD - %
Input voltage, V
- mV
i
Output power, P
O
- W
No. 2136—3/8
Page 4
Total harmonic distortion, THD - %Output power, P
STK4171 V
- WVoltage gain, VG - dBQuiescent current, I
Output power, P
O
- WVoltage gain, VG - dB
O
Output power, P
Supply voltage, V
O
CC
- W
- V
- mA
CCO
Frequency, f - Hz
Frequency, f - Hz
- mV
N
Frequency, f - Hz
Neutral voltage, V
Operating substrate temperature, Tc - ° C
No. 2136—4/8
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STK4171 V
- mA
CCO
Quiescent current, I
IC Power dissipation, Pd - W
Supply voltage, V
CC
- V
- mV
N
Neutral voltage, V
IC Power dissipation, Pd - W
Output power, P
O
- W
Output power, P
O
- W
Description of External Parts
No. 2136—5/8
Page 6
STK4171 V
Ω
C3, C4
Input filter capacitors
• A filter formed with R5 or R6 can be used to reduce noise at high frequencies.
Input coupling capacitors
• Used to block DC current. When the reactance of the capacitor increases at low frequencies, the dependence of 1/f noise on signal source
C5, C6
resistance causes the output noise to worsen. It is better to decrease the reactance.
• To reduce the pop noise at the time of application of power, it is effective to increase C5, C6 that fix the time constant on the input side and
to decrease C9, C10 on the NF side.
NF capacitors
• These capacitors fix the low cutoff frequency as shown below.
C9, C10
f
L
2πC9R7⋅⋅
1
---------------------------=
To provide the desired voltage gain at low frequencies, it is better to increase C9. However, do not increase C9 more than needed because
the pop noise level becomes higher at the time of application of power.
C19
C15, C16
Decoupling capacitor
• Used to eliminate the ripple components that mix into the input side from the power line (+V
Bootstrap capacitors
• When the capacitor value is decreased, the distortion is liable to be higher at low frequencies.
Oscillation blocking capacitors
C17, C18
• Must be inserted as close to the IC power supply pins as possible so that the power supply impedance is decreased to operate the IC stably.
• Electrolytic capacitors are recommended for C17, C18.
C20
C13
Capacitor for ripple filter
• Capacitor for the TR12-used ripple filter in the IC system
Oscillation blocking capacitor
• A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C13.
R5, R6 Resistors for input filter
R3, R4
Input bias resistors
• Used to bias the input pin potential to zero. These resistors fix the input impedance practically.
These resistors fix voltage gain VG.
R7, R9
(R8, R10)
It is recommended to use R7 (R8) = 560
• To adjust VG, it is desirable to change R7 (or R8).
, R9 (R10) = 56k Ω for VG = 40dB.
• When R7 (or R8) is changed to adjust VG, R3 (=R4) =R9 (=R10) must be set to ensure V
R11, R20
(R12, R21)
R15
Bootstrap resistors
• The quiescent current is set by these resistors 3.3k Ω + 3.3k Ω . It is recommended to use this resistor value.
Resistor for ripple filter
• (Limiting resistor for predriver TR at the time of load short)
R14 Used to ensure plus/minus balance at the time of clip.
Resistor for ripple filter
R18, R19
• When muting TR13 is turned ON, current flows from ground to -V
allowing for the power that may be dissipated on that occasion.
R24, R25 Oscillation blocking resistors
R22, R23 Oscillation blocking resistors
L1, L2 Oscillation blocking coils
[Hz]
).
CC
balance.
N
through TR 13. It is recommended to use 1k Ω (1W) + 1k Ω (1W)
CC
No. 2136—6/8
Page 7
STK4171 V
Sample Application Circuit
(protection circuit and muting circuit)
Thermal Design
The IC power dissipation of the STK4171V at the IC-operated mode is 61W max. at load resistance 8 Ω and 86W max. at
load resistance 4 Ω (simultaneous drive of 2 channels) for continuous sine wave as shown in Figure 1 and 2.
IC Power dissipation, Pd - W
Output power, P
Figure 1. STK4171V Pd – P
O
- W
(R
= 8 Ω )
O
L
IC Power dissipation, Pd - W
Output power, P
Figure 2. STK4171V Pd – P
O
- W
(R
= 4 Ω )
O
L
No. 2136—7/8
Page 8
STK4171 V
In an actual application where a music signal is used, it is impractical to estimate the power dissipation based on the continuous signal as shown above, because too large a heat sink must be used. It is reasonable to estimate the power dissipation as 1/10 Po max. (EIAJ).
That is, Pd = 38W at 8Ω, Pd = 49W at 4Ω
Thermal resistance θc-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below.
Condition 1: Tc = Pd × θc-a + Ta ≤ 125°C............................................... (1)
where Ta : Specified ambient temperature
Tc : Operating substrate temperature
Condition 2: Tj= Pd × (θc-a) + Pd/4 × (θj-c) + Ta ≤ 150°C..................... (2)
where Tj : Junction temperature of power transistor
Assuming that the power dissipation is shared equally among the four power transistors (2 channels × 2), thermal resistance θj-c is 1.8°C/W and
Pd × (θc-a + 1.8/4) + Ta ≤ 150°C........................................(3)
Thermal resistance θc-a of a heat sink must satisfy inequalities (1) and (3).
Figure 3 shows the relation between Pd and θc-a given
from (1) and (3) with Ta as a parameter.
[Example] The thermal resistance of a heat sink is
obtained when the ambient temperature specified for a stereo amplifier is 50°C.
Assuming VCC = ±32.5V, RL = 8Ω,
VCC = ±28V, RL = 4Ω,
RL = 8Ω : Pd1 = 38W at 1/10 Po max.
RL = 4Ω : Pd2 = 49W at 1/10 Po max.
The thermal resistance of a heat sink is
obtained from Figure 3.
RL = 8Ω : θc-a1 = 1.97°C/W
RL = 4Ω : θc-a2 = 1.53°C/W
Tj when a heat sink is used is obtained from
(3).
RL = 8Ω : Tj = 141.9°C
RL = 4Ω : Tj = 147°C
Thermal resistance of heat sink, θc-a - °C/W
IC Power dissipation, Pd - W
Figure 3. STK4171V θc-a – Pd
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-pre v ention equipment and the lik e, 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 e xample 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.
This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice.
No. 2136—8/8
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