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PDF STK403-440 Data sheet ( Hoja de datos )
| Número de pieza | STK403-440 | |
| Descripción | 6-Channel Class AB Audio Power Amplifier IC | |
| Fabricantes | Sanyo | |
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Ordering number : ENN*7375
Preliminary
Thick-Film Hybrid IC
STK403-440
Six-Channel Class AB Audio Power Amplifier IC
25 W × 6 Channels
Overview
The STK403-400 series products are audio power
amplifier hybrid ICs that consist of optimally-designed
discrete component power amplifier circuits that have
been miniaturized using SANYO’s unique insulated metal
substrate technology (IMST). The adoption of a newly-
developed low thermal resistance substrate allows this
product to integrate six power amplifier channels in a
single compact package. The adoption of a standby circuit
in this device allows it to reduce impulse noise
significantly as compared to earlier Sanyo products, in
particular, the STK402-*00 series products.
Features
Package Dimensions
unit: mm
4202-SIP28
[STK403-440]
• Series of pin compatible power amplifiers ranging from
30 W/ch to 45 W/ch (10%/1 kHz) devices. The same
printed circuit board can be used depending on the
output power grade.
• Miniature packages
— 78.0 mm × 32.0 mm × 9.0 mm *
*: Not including the pins.
• Output load impedance: RL = 6 Ω
• Allowable load shorted time: 0.3 seconds
• Supports the use of standby and muting circuits.
SANYO: SIP28
omAny and all SANYO products described or contained herein do not have specifications that can handle
.capplications that require extremely high levels of reliability, such as life-support systems, aircraft’s
ucontrol systems, or other applications whose failure can be reasonably expected to result in serious
t4physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
eeSANYO 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
hparameters) listed in products specifications of any and all SANYO products described or contained
s herein.
.data SANYO Electric Co.,Ltd. Semiconductor CompanyTOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
www 21604TN (OT) No. 7375-1/8
1 page  
STK403-440
Thermal Design Example
The heat sink thermal resistance, θc-a, required to handle the total power dissipated within this hybrid IC is determined as
follows.
Condition 1: The IC substrate temperature Tc must not exceed 125°C.
Pd × θc-a + Ta < 125°C ... (1)
Ta: Guaranteed ambient temperature for the end product.
Condition 2: The junction temperature of each transistor must not exceed 150°C.
Pd × θc-a + Pd/N × θj-c + Ta < 150°C ... (2)
N: Number of power transistors
θj-c: Thermal resistance per power transistor
We take the power dissipation in the power transistors to be Pd evenly distributed across those N power transistors.
If we solve for θc-a in equations (1) and (2), we get the following inequalities.
θc-a < (125 – Ta)/Pd ... (1)’
θc-a < (150 – Ta)/Pd – θj-c/N ... (2)’
Values that satisfy both these inequalities at the same time are the required heat sink thermal resistance values.
Determining the following specifications allows us to obtain the required heat sink thermal resistance from inequalities
(1)’ and (2)’.
• Supply voltage: VCC
• Load resistance: RL
• Guaranteed ambient temperature: Ta
Example:
Assume that the IC supply voltage, VCC, is ±26 V, RL is 6 Ω, and that the signal is a continuous sine wave. In this case,
from the Pd – PO characteristics, the maximum power will be 134 W for a signal with a frequency of 1 kHz.
For actual music signals, it is usual to use a Pd of 1/8 of POmax, which is the power estimated for continuous signals in
this manner. (Note that depending on the particular safety standard used, a value somewhat different from the value of
1/8 used here may be used.)
That is:
Pd = 85 W (when 1/8 POmax is 3.1 W)
The number, N, of power transistors in the hybrid IC's audio amplifier block is 12. Since the thermal resistance, θj-c, per
transistor is 3.6°C/W, the required heat sink thermal resistance, θc-a, for a guaranteed ambient temperature of 50°C will
be as follows.
From inequality (1)’: θc-a < (125 – 50)/85
< 0.88
From inequality (2)’: θc-a < (150 – 50)/85 – 3.6/12
< 0.87
Therefore, the thermal resistance that satisfies both these expressions at the same time is 0.87°C/W.
Note that this thermal design example assumes the use of a constant-voltage power supply, and is only provided as an
example for reference purposes. Thermal designs must be tested in an actual end product.
No. 7375-5/8
5 Page | ||
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