STK4161
V
SANYO Electric Co., Ltd. Semiconductor Business Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
70997HA (ID) / 8308TA No. 2135--1/8
Ordering number: EN2135B
Thick Film Hybrid IC
AF Power Amplifier (Split Power Supply)
(35W + 35W min, THD = 0.08%)
Features
Pin-compatible with the STK4102II series. The
STK4101V series use the same package and are avail-
able for output 15W to 50W.
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
Package Dimensions
unit: mm
4040
[STK4161
V
]
Specifications
Maximum Ratings
at Ta = 25
C
Recommended Operating Conditions
at Ta = 25
C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
46
V
Thermal resistance
j-c
2.1
C/W
Junction Temperature
Tj
150
C
Operating substrate temperature
Tc
125
C
Storage temperature
Tstg
-
30 to +125
C
Available time for load short-circuit
t
s
*1
V
CC
=
30.5V, R
L
= 8
, f = 50Hz, Po = 35W
2
s
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
30.5
V
Load resistance
R
L
8
STK4161
V
No. 2135--2/8
Notes.
For power supply at the time of test, use a constant-voltage power 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.
Operating Characteristics
at Ta = 25
C, V
CC
=
30.5V, R
L
= 8
, VG = 40dB, Rg = 600
,
R
L
: non-inductive load
Parameter
Symbol
Conditions
min
typ
max
Unit
Quiescent current
Icco
V
CC
=
36.5V
20
40
100
mA
Output power
Po (1)
THD = 0.08%,
f = 20Hz to 20kHz
35
W
Po (2)
V
CC
=
26.5V, THD = 0.2%,
R
L
= 4
, f = 1kHz
40
W
Total harmonic distortion
THD
Po = 1.0W, f = 1kHz
0.08
%
Frequency response
f
L
, f
H
Po = 1.0W,
dB
20 to 50k
Hz
Input impedance
r
i
Po = 1.0W, f = 1kHz
55
k
Output noise voltage
V
NO
*2
V
CC
=
36.5V
1.2
mVrms
Neutral voltage
V
N
V
CC
=
36.5V
70
0
+70
mV
Muting voltage
V
M
2
5
10
V
+0
3
Specified Transformer Power Supply
(Equivalent to RP-25)
Equivalent Circuit
STK4161
V
No. 2135--3/8
Sample Application Circuit
Sample Printed Circuit Pattern for Application Circuit
(Cu-foiled side)
Input voltage, Vi - mV
Output po
wer
, Po -
W
Output power, P
O
- W
T
otal harmonic distortion,
THD - %
STK4161
V
No. 2135--4/8
Output power, P
O
- W
Supply voltage, V
CC
- V
Frequency, f - Hz
T
otal harmonic distortion,
THD - %
Output po
wer
, P
O
-
W
V
oltage g
ain,
V
G
- dB
Frequency, f - Hz
Frequency, f - Hz
Operating substrate temperature, Tc -
C
Output po
wer
, P
O
-
W
V
oltage g
ain,
V
G
- dB
Quiescent current, Icco - mA
STK4161
V
No. 2135--5/8
Supply voltage, V
CC
- V
Output power, P
O
- W
Quiescent current, Icco - mA
Neutral v
oltage,
V
N
- mV
IC Po
wer dissipation, Pd -
W
Output power, P
O
- W
IC Po
wer dissipation, Pd -
W
Description of External Parts
STK4161
V
No. 2135--6/8
C3, C4
Input filter capacitors
A filter formed with R5 or R6 can be used to reduce noise at high frequencies.
C5, C6
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 C5, C6 that fix the time constant on the input side and
to decrease C9, C10 on the NF side.
C9, C10
NF capacitors
These capacitors fix the low cutoff frequency as shown below.
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
Decoupling capacitor
Used to eliminate the ripple components that mix into the input side from the power line (+V
CC
).
C15, C16
Bootstrap capacitors
When the capacitor value is decreased, the distortion is liable to be higher at low frequencies.
C17, C18
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 C17, C18.
C20
Capacitor for ripple filter
Capacitor for the TR12-used ripple filter in the IC system
C13
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.
R7, R9
(R8, R10)
These resistors fix voltage gain VG.
It is recommended to use R7 (R8) = 560
, R9 (R10) = 56k
for VG = 40dB.
To adjust VG, it is desirable to change R7 (or R8).
When R7 (or R8) is changed to adjust VG, R3 (=R4) =R9 (=R10) must be set to ensure V
N
balance.
R11, R20
(R12, R21)
Bootstrap resistors
The quiescent current is set by these resistors 3.3k
+ 3.3k
. It is recommended to use this resistor value.
R15
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.
R18, R19
Resistor for ripple filter
When muting TR13 is turned ON, current flows from ground to -V
CC
through TR 13. It is recommended to use 1k
(1W) + 1k
(1W)
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
f
L
1
2
C9 R7
-----------------------------------
=
[Hz]
STK4161
V
No. 2135--7/8
Sample Application Circuit
(protection circuit and muting circuit)
Thermal Design
The IC power dissipation of the STK4161V at the IC-operated mode is 52W max. at load resistance 8
and 76W max. at
load resistance 4
(simultaneous drive of 2 channels) for continuous sine wave as shown in Figure 1 and 2.
Figure 1. STK4161V Pd P
O
(R
L
= 8
)
Figure 2. STK4161V Pd P
O
(R
L
= 4
)
Output power, P
O
- W
IC Po
wer dissipation, Pd -
W
Output power, P
O
- W
IC Po
wer dissipation, Pd -
W
STK4161
V
No. 2135--8/8
s
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.
s
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.
s
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.
This catalog provides information as of July, 1997. Specifications and information herein are subject to change without notice.
In an actual application where a music signal is used, it is impractical to estimate the power dissipation based on the con-
tinuous signal as shown above, because too large a heat sink must be used. It is reasonable to estimate the power dissipa-
tion as 1/10 Po max. (EIAJ).
That is, Pd = 32W at 8
, Pd = 42W at 4
Thermal resistance
c-a of a heat sink for this IC power dissipation (Pd) is fixed under conditions 1 and 2 shown below.
Condition 1: Tc
= Pd
c-a + Ta
125
C............................................... (1)
where
Ta : Specified ambient temperature
Tc : Operating substrate temperature
Condition 2: Tj= Pd
(
c-a) + Pd/4
(
j-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 resis-
tance
j-c is 2.1
C/W and
Pd
(
c-a + 2.1/4) + Ta
150
C ........................................ (3)
Thermal resistance
c-a of a heat sink must satisfy ine-
qualities (1) and (3).
Figure 3 shows the relation between Pd and
c-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 speci-
fied for a stereo amplifier is 50
C.
Assuming V
CC
=
30.5V, R
L
= 8
,
V
CC
=
26.5V, R
L
= 4
,
R
L
= 8
: Pd1 = 32W at 1/10 Po max.
R
L
= 4
: Pd2 = 42W at 1/10 Po max.
The thermal resistance of a heat sink is
obtained from Figure 3.
R
L
= 8
:
c-a1 = 2.34
C/W
R
L
= 4
:
c-a2 = 1.79
C/W
Tj when a heat sink is used is obtained from
(3).
R
L
= 8
: Tj = 141.8
C
R
L
= 4
: Tj = 147.1
C
Figure 3. STK4161V
c-a Pd
IC Power dissipation, Pd - W
Thermal resistance of heat sink,
c-a -
C/W
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