STK401-290.PDF

Ordering number:ENN*5385

Thick Film Hybrid IC

STK401-290

2ch AF Power Amplifier (Split Power Supply)

(50W + 50W min, THD = 0.08%)

Preliminary

Overview

The STK401-290 is a 2-channel audio power amplifier IC

that supports 6/3

Package Dimensions

unit:mm

4134

00 series) and 2-channel output devices (STK401-

[STK401-290]

series). In addition, it supports 6/3

output load imped-

64.0

ance.

55.6

8.5

Features

• Pin compatible with the 3-channel output devices

(STK400-

3.6

00 series) and 2-channel output devices

00 series)

• Output load impedance R L =6/3

2.9

supported

• Pin configuration grouped into individual blocks of

inputs, outputs and supply lines to minimize the

adverse effects of pattern layout on operating character-

istics.

• Few external components

2.54

0.5

0.4

(8.75)

15 ´ 2.54=38.1

5.5

SANYO : SIP16

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

93099TH (KT)/32596HA (ID) No.5385–1/7

output load impedances. It is fully pin

compatible with the 3-channel output devices (STK400-

(STK401-

STK401-290

Specifications

Maximum Ratings at Ta = 25˚C

V C

˚C/W

˚C

–

t s

V C

Operating Characteristics at Ta = 25˚C, R L =6

(noninductive load), Rg=600

, VG=40dB

P O 1

V C

P O 2

R L =

V C

P O

V C

–3 dB

f L , H

V C

r i

V C

k W

V N

V C

V N

V C

–

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.5385–2/7

STK401-290

Equivalent Circuit

Sample Application Circuit

No.5385–3/7

STK401-290

Series Configuration

These devices form a series of pin-compatible devices with different number of output channels, output ratings and total

harmonic distortion. Some of these devices are under development. Contact your Sanyo sales representative if you re-

quire more detailed information.

(

[

(

[

V C

amV C

amV C 1V C 2

´ 3

´ 2

´ 3

´ 2

´ 3

´ 2

´ 3

´ 2

´ 3

´ 2

´ 3

´ 2

´ 3

´ 2

[

(

[

V C

amV C

amV C 1V C 2

1. V CC max1 (R L =6

), V CC max2 (R L =3 to 6

), V CC 1 (R L =6

), V CC 2 (R L =3

)

No.5385–4/7

STK401-290

c-a, required to dissipate

the STK401-290 device total power dissipation, Pd, is de-

termined as follows :

The total device power dissipation when STK401-290

V CC =

, for a continuous sine wave sig-

nal, is a maximum of 71W, as shown in the Pd–P O graphs.

32V and R L =6

Condition 1: IC substrate temperature not to exceed 125

When estimating the power dissipation for an actual audio

signal input, the rule of thumb is to select Pd correspond-

ing to (1/10)

´q

c-a+Ta<125

C ............................................ (1)

P O max (within safe limits) for a continuous

sine wave input. For example,

Where Ta is the guaranteed maximum ambient tempera-

ture.

Pd=44W [for (1/10)

P O max=5W]

Condition 2: Power transistor junction temperature, Tj, not

to exceed 150

The STK401-290 has 4 power transistors, and the thermal

resistance per transistor,

´q

c-a+Pd/N

´q

j-c+Ta<150

C ......................... (2)

C/W. If the guaran-

teed maximum ambient temperature, Ta, is 50

j-c, is 1.7

C, then the

j-c is the

power transistor thermal resistance per transistor. Note that

the power dissipated per transistor is the total, Pd, divided

evenly among the N power transistors.

required heatsink thermal resistance,

c-a, is :

From expression (1)’ :

c-a < (125–50)/44

< 1.70

From expression (2)’ :

c-a < (150–50)/44–1.7/4

< 1.84

Expressions (1) and (2) can be rewritten making

c-a the

subject.

c-a< (125–Ta)/Pd ............................................ (1)’

Therefore, to satisfy both expressions, the required heatsink

must have a thermal resistance less than 1.70

C/W.

c-a< (150–Ta)/Pd–

j-c/N ................................ (2)’

Similarly, when STK401-290 V CC =

26V and R L =3

The heatsink required must have a thermal resistance that

simultaneously satisfies both expressions.

Pd=51.2W [for (1/10)

P O max=5W]

From expression (1)’ :

c-a < (125–50)/51.2

< 1.46

The heatsink thermal resistance can be determined from

(1)’ and (2)’ once the following parameters have been de-

fined.

From expression (2)’ :

c-a < (150–50)/51.2–1.7/4

< 1.52

• Supply voltage : V CC

• Load resistance : R L

• Guaranteed maximum ambient temperature : Ta

C/W.

This heatsink design example is based on a constant-volt-

age supply, and should be verified within your specific set

environment.

No.5385–5/7

Heatsink Design Considerations

The heatsink thermal resistance,

where N is the number of power transistors and

Therefore, to satisfy both expressions, the required heatsink

must have a thermal resistance less than 1.46

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