SANYO STK4171V

Ordering number: 2136B
Thick Film Hybrid IC
STK4171V
AF Power Amplifier (Split Power Supply)
(40W + 40W min, THD = 0.08%)
Features
Package Dimensions
• Pin-compatible with the STK4102II series. The
STK4101V series use the same package and are available 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
unit: mm
4040
[STK4171V]
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Thermal resistance
Junction temperature
Operating substrate temperature
Ratings
Unit
VCC max
Symbol
Conditions
±49
V
θj-c
1.8
°C/W
Tj
150
°C
Tc
Storage temperature
Tstg
Available time for load short-circuit
ts *1
VCC = ±32.5V, RL = 8Ω, f = 50Hz, Po = 40W
125
°C
−30 to +125
°C
2
s
Ratings
Unit
Recommended Operating Conditions at Ta = 25°C
Parameter
Symbol
Conditions
Recommended supply voltage
VCC
±32.5
V
Load resistance
RL
8
Ω
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. 2136—1/8
STK4171V
Operating Characteristics at Ta = 25°C, VCC = ±32.5V, RL = 8Ω, VG = 40dB, Rg = 600Ω,
RL : non-inductive load
Parameter
Quiescent current
Symbol
Frequency response
Input impedance
Output noise voltage
typ
max
Unit
100
mA
VCC = ±39V
20
PO (1)
40
W
PO (2)
VCC = ±28V, THD = 1.0%,
RL = 4Ω, f = 1kHz
45
W
THD
PO = 1.0W, f = 1kHz
fL, fH
+0
PO = 1.0W,
dB
–3
ri
VNO *2
Neutral voltage
VN
Muting voltage
VM
Notes.
min
THD = 0.08%,
f = 20Hz to 20kHz
ICCO
Output power
Total harmonic distortion
Conditions
40
0.08
PO = 1.0W, f = 1kHz
20 to 50k
Hz
55
kΩ
VCC = ±39V, Rg = 10kΩ
VCC = ±39V
%
1.2
mVrms
–70
0
+70
mV
–2
–5
–10
V
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.
Specified Transformer Power Supply
(Equivalent to MG-200)
Equivalent Circuit
No. 2136—2/8
STK4171V
Sample Application Circuit
Output power, PO - W
Total harmonic distortion, THD - %
Sample Printed Circuit Pattern for Application Circuit (Cu-foiled side)
Input voltage, Vi - mV
Output power, PO - W
No. 2136—3/8
Voltage gain, VG - dB
Output power, PO - W
Output power, PO - W
Supply voltage, VCC - V
Frequency, f - Hz
Neutral voltage, VN - mV
Quiescent current, ICCO - mA
Voltage gain, VG - dB
Output power, PO - W
Total harmonic distortion, THD - %
STK4171V
Frequency, f - Hz
Frequency, f - Hz
Operating substrate temperature, Tc - °C
No. 2136—4/8
Output power, PO - W
IC Power dissipation, Pd - W
Supply voltage, VCC - V
IC Power dissipation, Pd - W
Neutral voltage, VN - mV
Quiescent current, ICCO - mA
STK4171V
Output power, PO - W
Description of External Parts
No. 2136—5/8
STK4171V
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.
1
- [Hz]
f L = -------------------------2π ⋅ C9 ⋅ R7
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 (+VCC).
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) = 560Ω, R9 (R10) = 56kΩ 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 VN balance.
R11, R20
(R12, R21)
Bootstrap resistors
• The quiescent current is set by these resistors 3.3kΩ + 3.3kΩ. It is recommended to use this resistor value.
R15
R14
Resistor for ripple filter
• (Limiting resistor for predriver TR at the time of load short)
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 -VCC through TR 13. It is recommended to use 1kΩ (1W) + 1kΩ (1W)
allowing for the power that may be dissipated on that occasion.
R24, R25
Oscillation blocking resistors
R22, R23
L1, L2
Oscillation blocking resistors
Oscillation blocking coils
No. 2136—6/8
STK4171V
Sample Application Circuit (protection circuit and muting circuit)
Thermal Design
IC Power dissipation, Pd - W
IC Power dissipation, Pd - W
The IC power dissipation of the STK4171V at the IC-operated mode is 61W max. at load resistance 8Ω and 86W max. at
load resistance 4Ω (simultaneous drive of 2 channels) for continuous sine wave as shown in Figure 1 and 2.
Output power, PO - W
Figure 1. STK4171V Pd – PO (RL = 8Ω)
Output power, PO - W
Figure 2. STK4171V Pd – PO (RL = 4Ω)
No. 2136—7/8
STK4171V
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
[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
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.
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-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:
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.
➀
■
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.
No. 2136—8/8