STK405-120, STK(1)
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Ordering number:ENN5173
Thick Film Hybrid IC
STK405-120
2ch AF Power Amplifier (Split Power Supply)
(80W + 80W min, THD = 10%)
Overview
The STK405-120, a member of the STK405-000 series, is
a low-cost, 2-channel audio power amplifier hybrid IC that
is ideal for a wide range of stereo sets. It has dedicated 6
Package Dimensions
unit:mm
4162
[STK405-120]
W
/3
W
output drive.
support
• EIAJ-output compatible (f=1kHz, THD=10%)
• Low supply switching shock noise
• Pin assignment grouped into individual blocks of
inputs, outputs and supply lines to minimize the
adverse effects of pattern layout on operating character-
istics
• External boostrap circuit not necessary
• Standby operation possible using external circuit
• Voltage gain VG=26dB for easy gain distribution within
the set
• Member of 10W/ch to 80W/ch pin-compatible series
W
Series Organization
The following devices form a series with differing output
capacity. Some of the following devices are under devel-
opment. Contact your Sanyo sales representative if you re-
quire more detailed information.
S
v
[
T
N
O
p
V
C
m
V
C
S
1
+
1
±
±
S
2
+
2
±
±
S
3
+
3
±
±
S
4
+
4
±
±
S
5
+
5
±
±
S
6
+
6
±
±
S
7
+
7
±
±
S
8
+
8
±
±
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
O3099TH (KT)/O1295HA (ID) No.5173–1/6
W
output drive, in contrast with the STK401-000 series which
supports 6
Features
• Class B amplifiers
• Output load impedance R
L
=6
STK405-120
Specifications
Maximum Ratings
at Ta = 25ËšC
P
S
C
R
U
M
s
v
V
C
m
±
V
T
r
q
j
P
p
t
1
ËšC/W
J
t
T
1
ËšC
O
t
T
1
ËšC
ËšC
S
t
T
–
t
+
A
t
f
l
s
t
s
V
C
=
R
L
=
W
,
f
P
O
=
1
s
Operating Characteristics
at Ta = 25ËšC, R
L
=6
W
(noninductive load), Rg=600
W
, VG=26dB
R
P
S
C
U
m
t
m
Q
c
I
C
V
C
=
n
l
1
2
m
O
p
P
O
V
C
=
f
T
8
W
T
h
d
T
V
C
=
f
P
O
=
0
0
%
F
r
f
L
f
,
H
V
C
=
P
O
=
+0
–3
dB
2
t
5
H
I
i
r
i
V
C
=
f
P
O
=
5
k
W
O
n
v
V
N
V
C
=
R
W
1
m
N
v
V
N
V
C
=
–
0
+
m
Note.
All tests are measured using a constant-voltage supply unless otherwise specified.
Available time for load short-circuit and output noise voltage are measured using the transformer supply specified below.
The output noise voltage is the peak value of an average-reading meter with an rms value scale (VTVM). A regulated AC
supply (50Hz) should be used to eliminate the effects of AC primary line flicker noise.
Specified Transformer Supply (MG-200 or Equivalent)
No.5173–2/6
STK405-120
Block Diagram
Test Circuit
No.5173–3/6
STK405-120
Sample Application Circuit (Standby Mode Supported)
c-a, required to dissipate
the STK405-120 device total power dissipation, Pd, is de-
termined as follows :
q
The heatsink required must have a thermal resistance that
simultaneously satisfied both expressions.
Condition 1: IC substrate temperature not to exceed 125
°
C
The heatsink thermal resistance can be determined from
(1)’ and (2)’ once the following parameters have been de-
fined.
Pd
´q
c-a+Ta<125
°
C ............................................ (1)
Where Ta is the guaranteed maximum ambient tempera-
ture.
• Supply voltage : V
CC
• Load resistance : R
L
• Guaranteed maximum ambient temperature : Ta
Condition 2: Power transistor junction temperature, Tj, not
to exceed 150
°
C
The total device power dissipation when STK405-120
V
CC
=
Pd
´q
c-a+Pd/N
´q
j-c+Ta<150
°
C ......................... (2)
, for a continuous sine wave sig-
nal, is a maximum of 74W, as shown in the Pd–P
O
charac-
teristics graph.
±
33.0V and R
L
=6
W
j-c is the
power transistor thermal resistance per transistor. Note that
the power dissipated per transistor is the total, Pd, devided
evenly among the N power transistors.
q
When estimating the power dissipation for an actual audio
signal input, the rule of thumb is to select Pd correspond-
ing to 1/10 P
O
max (within safe limits) for a continuous
sine wave input. For example,
Expressions (1) and (2) can be rewritten making
q
c-a the
subject.
q
c-a< (125–Ta)/Pd ............................................ (1)’
Pd=53W [for 1/10 P
O
max=8W]
q
c-a< (150–Ta)/Pd–
q
j-c/N ................................ (2)’
The STK405-120 has 4 power transistors, and the thermal
resistance per transistor,
C/W. If the graranteed
maximum ambient temperature, Ta, is 50
q
j-c, is 1.8
°
°
C, then the re-
quired heatsink thermal resistance,
q
c-a, is :
No.5173–4/6
Heatsink Design Considerations
The heatsink thermal resistance,
where N is the number of power transistors and
STK405-120
From expression (1)’ :
q
c-a < (125–50)/53
< 1.41
Therefore, to satisfy both expressions, the required heatsink
must have a thermal resistance less than 1.41
°
C/W.
From expression (2)’ :
q
c-a < (150–50)/53–1.8/4
< 1.43
The heatsink design example is based on a constant-volt-
age supply, and should be verified within your specific set
environment.
No.5173–5/6
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