Ordering number: EN2305C
±
°
°
°
−
°
±
8
Thick Film Hybrid IC
STK4192 II
AF Power Amplifier (Split Power Supply)
(50W + 50W min, THD = 0.4%)
Features
• The STK4102II series (STK4192II) and STK4101V
series (high-grade type) are pin-compatible in the output range of 6W to 50W and enable easy design.
• Small-sized package whose pin assignment is the same
Package Dimensions
unit: mm
4040
[STK4192 II ]
as that of the STK4101II series
• Built-in muting circuit to cut off various kinds of pop
noise
• Greatly reduced heat sink due to substrate temperature
125 ° C guaranteed
• 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
θ
j-c 1.8
30 to +125
V
s
= ± 35V, R
CC
= 8 Ω , f = 50Hz, P
L
= 50W 2 s
O
52.5 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
35 V
Ω
70997HA (ID) / D2593YK / 0078TA / 7167AT, TS No. 2305—1/8
STK4192 II
Operating Characteristics
at Ta = 25 ° C, V
R
: non-inductive load
L
= ± 35V, 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
NO
N
M
V
= ± 42V 20 40 100 mA
CC
THD = 0.4%,
f = 20Hz to 20kHz
V
= ± 31V, THD = 1.0%,
CC
R
= 4 Ω , f = 1kHz
L
= 1.0W, f = 1kHz 0.3 %
O
P
O
P
O
V
CC
V
CC
+0
= 1.0W, dB 20 to 50k Hz
–3
= 1.0W, f = 1kHz 55 k Ω
= ± 42V, Rg = 10k Ω
= ± 42V –70 0 +70 mV
Notes. For power supply at the time of test, use a constant-voltage po w er supply
unless otherwise specified.
For measurement of the available time for load short-circuit and output
noise voltage, use the specified transformer power supply shown right.
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.
Equivalent Circuit
= 8 Ω , Rg = 600 Ω , VG = 40dB,
L
50 W
55 W
–2 –5 –10 V
Specified Transformer Power Supply
(Equivalent to MG-200)
1.2 mVrms
No. 2305—2/8
STK4192 II
Sample Application Circuit :
50W min 2-channel AF power amplifier
Sample Printed Circuit Pattern for Application Circuit
(Cu-foiled side)
No. 2305—3/8
- WTotal harmonic distortion, THD - %Voltage gain, VG - dB
O
Output power, P
STK4192 II
Total harmonic distortion, THD - %Output power, P
Input voltage, Vi - mV
Output power, P
O
- W
Output power, P
- WQuiescent current, Icco - mA
O
Frequency, f - Hz
O
- W
Frequency, f - Hz
Operating substrate temperature, Tc - ° C
No. 2305—4/8
- mV
N
Neutral voltage, V
Quiescent current, Icco - mA
STK4192 II
- mV
- WIC power dissipation, Pd - W
N
O
Output power, P
Neutral voltage, V
IC power dissipation, Pd - WVoltage gain, VG - dB
Supply voltage, V
Output power, P
O
CC
- W
- V
Supply voltage, V
Output power, P
CC
O
- V
- W
Frequency, f - Hz
No. 2305—5/8
Description of External Parts
STK4192 II
Ω
C1, C2
C3, C4
C5, C6
C15
C11, C12
C9, C10
C14
C7
R3, R4 Resistors for input filter
R1, R2
R5, R9
(R6, R10)
R11, R13
(R12, R14)
R21
R18 Used to ensure plus/minus balance at the time of clip.
R19, R20
R15, R16 Oscillation blocking resistors
Input filter capacitors
• A filter formed with R3 or R4 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
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 C3, C4 that fix the time constant on the input side and
to decrease C5, C6 on the NF side.
NF capacitors
• These capacitors fix the low cutoff frequency as shown below.
1
--------------------------=
f
L
2
π
C5 R5
⋅⋅
To provide the desired voltage gain at low frequencies, it is better to increase C5. However, do not increase C5 more than needed because
the pop noise level becomes higher at the time of application of power.
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
• 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 C9, C10.
Capacitor for ripple filter
• Capacitor for the TR10-used ripple filter in the IC system
Oscillation blocking capacitor
• A polyester film capacitor, being excellent in temperature characteristic, frequency characteristic, is recommended for C7.
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.
It is recommended to use R5 (R6) = 560
• To adjust VG, it is desirable to change R9 (or R10).
• When R9 (or R10) is changed to adjust VG, R1 (=R2) =R9 (=R10) must be set to ensure V
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 transistor at the time of load short
Resistor for ripple filter
• When muting TR11 is turned ON, current flows from ground to -V
allowing for the power that may be dissipated on that occasion.
, R9 (R10) = 56k Ω for VG = 40dB.
[Hz]
).
CC
balance.
N
through TR 11. It is recommended to use 1k Ω (1W) + 1k Ω (1W)
CC
No. 2305—6/8
STK4192 II
Sample Application Circuit
(protection circuit and muting circuit)
Thermal Design
The IC power dissipation of the STK4192II at the IC-operated mode is 66W max. at load resistance 8 Ω and 103W 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. STK4192II Pd – P
O
- W
(R
= 8 Ω )
O
L
IC Power dissipation, Pd - W
Output power, P
Figure 2. STK4192II Pd – P
O
- W
(R
= 4 Ω )
O
L
No. 2305—7/8
STK4192 II
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 = 43W at 8 Ω , Pd = 55W 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.
c-a - °C/W
θ
[Example] The thermal resistance of a heat sink is
obtained when the ambient temperature specified for a stereo amplifier is 50°C.
Assuming VCC = ±35V, RL = 8Ω, VCC = ±31V, RL = 4Ω,
RL = 8Ω : Pd1 = 43W at 1/10 Po max.
RL = 4Ω : Pd2 = 55W at 1/10 Po max.
The thermal resistance of a heat sink is
obtained from Figure 3.
RL = 8Ω : θc-a1 = 1.75°C/W
RL = 4Ω : θc-a2 = 1.35°C/W
Tj when a heat sink is used is obtained from
(3).
RL = 8Ω : Tj = 144.6°C
RL = 4Ω : Tj = 149°C
Thermal resistance of heat sink,
IC Power dissipation, Pd - W
Figure 3. STK4192II 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. 2305—8/8
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