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Ordering number : EN*A1630
Thick-Film Hybrid IC
STK433-290-E
Overview
3-channel class AB audio power IC, 80W+80W+80W
The STK433-290-E is a hybrid IC designed to be used in 80W x 3ch class AB audio power amplifiers.
Applications
* Audio power amplifiers.
Features
* Pin-to-pin compatible outputs ranging from 80W to 150W. * Can be used to replace the STK433-000/-100 series (30W to 150W x 2ch) and STK433-200(A) series (30W to 60W x 3ch) due to its pin compatibility. * Miniature package (64.0mm x 36.6mm x 9.0mm) * Output load impedance: RL = 6 to 4 supported * Allowable load shorted time: 0.3 second * Allows the use of predesigned applications for standby and mute circuits.
Series Models
STK433-290-E Output 1 (10%/1kHz) Output 2 (0.4%/20Hz to 20kHz) Maximum rating VCC max (no sig.) Maximum rating VCC max (6) Recommended operating VCC (6) Dimensions (excluding pin height) 80Wx3ch 50Wx3ch 54V 47V 33V STK433-300-E 100Wx3ch 60Wx3ch 57V 50V 36V STK433-320-E 120Wx3ch 80Wx3ch 65V 57V 41V STK433-330-E 150Wx3ch 100Wx3ch 71.5V 63V 44V
64.0mmx36.6mmx9.0mm
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.
21710HKIM No. A1630-1/13
STK433-290-E
Specifications
Absolute maximum ratings at Ta=25C, Unless otherwise specified Tc=25C
Parameter Maximum power supply voltage Maximum power supply voltage Minimum operating supply voltage #13 Operating voltage Thermal resistance Junction temperature Operating substrate temperature Storage temperature Allowable time for load short-circuit Symbol VCC max (0) VCC max (1) VCC min VST OFF max j-c Tj max Tc max Tstg ts VCC=33V, RL=6, f=50Hz, PO=50W, 1-channel active Per one power transistor Should satisfy Tj max and Tc max Non signal RL6 Conditions Ratings 54 47 10 -0.3 to +5.5 2.1 150 125 -30 to +125 0.3 Unit V V V V C/W C C C s
Operating Characteristics at Unless otherwise specified Tc=25C, RL=6 (Non-inductive Load), Rg=600, VG=30dB
Conditions *2 Parameter Output power *1 Symbol PO (1) PO (2) Total harmonic distortion *1 THD (1) THD (2) Frequency characteristics *1 Input impedance Output noise voltage Quiescent current Output neutral voltage #13 Stand-by ON threshold *5 *3 fL, fH ri VNO ICCO VN VST ON VST OFF VCC (V) 33 33 33 33 33 33 39 39 39 33 33 Stand-by Operation 2.5 1k f (Hz) 20 to 20k 1k 20 to 20k 1k 1.0 1.0 Rg=2.2k No loading 30 -70 70 0 0 3.0 +0 -3dB 5.0 PO (W) THD (%) 0.4 10 VG=30dB 0.01 20 to 50k 55 1.0 120 +70 0.6 Hz k mVrms mA mV V V min 47 Ratings unit typ 50 80 0.4 % max
W
#13 Stand-by OFF threshold *5
[Remarks] *1: For 1-channel operation *2: Unless otherwise specified, use a constant-voltage power supply to supply power when inspections are carried out. *3: The output noise voltage values shown are peak values read with a VTVM. However, an AC stabilized (50Hz) power supply should be used to minimize the influence of AC primary side flicker noise on the reading. *4: Use the transformer power supply circuit shown in the figure below for allowable load shorted time and output noise voltage measurement. *5: The impression voltage of `#13 (Stand-By) pin' must not exceed the maximum rating. Power amplifier operate by impressing voltage +2.5 to +5.5V to `#13 (Stand-By) pin'. *6: Please connect -PreVCC pin (#1 pin)with the stable minimum voltage, and connect so that current does not flow in by reverse bias. *7: Thermal design must be implemented based on the conditions under which the customer's end products are expected to operate on the market. *8: The case of this Hybrid-IC is using thermosetting silicon adhesive (TSE322SX). *9: Weight of HIC: 24.8g Outer carton dimensions (WxLxH): 452mmx325mmx192mm
DBA40C
10000F + +VCC 500 + 500 -VCC 10000F
Designated transformer power supply (MG-200 equivalent)
No. A1630-2/13
STK433-290-E
Package Dimensions
unit:mm (typ)
64.0 55.6 (R1.8) 9.0
18.7
36.6
5.0
1 3.6 2.0 (9.8) 18 2.0=36.0
19
4.0
25.8
2.9 0.4 5.5
0.5
RoHS DIRECTIVE PASS
Equivalent Circuit
3
8
Pre Driver CH1
11 12
Pre Driver CH2 MONO IC
Pre Driver CH3
+ -
+ -
+ -
Bias Circuit
1 2
SUB
9 5467 10 13 14 15 16 17 19 18
No. A1630-3/13
STK433-290-E
Application Circuit STK433-300sr
Ch1 -PRE -VCC +VCC OUT 1 2 3 R20 R08 4 Ch1 Ch1 Ch2 Ch2 OUT OUT OUT +PRE SUB GND IN 5 R21 C19 C20 C21 R10 C10 R09 C12 C05 R11 C13 R12 C14 R13 C15 R05 R23 C04 R01 C23 C01 R15 GND C02 R17 L01 C16 Ch1 OUT C03 L02 R16 C17 R18 GND GND GND C18 R19 Ch2 OUT R02 L03 Ch3 OUT R06 R03 C08 GND C07 Ch1 IN C06 R04 Ch3 IN R07 C09 Ch2 IN Ch2 IN 6 7 8 9 10 11 Ch1 NF 12 ST- Ch2 BY NF 13 14 Ch2 Ch3 IN IN 15 16 Ch3 NF 17 Ch3 Ch3 OUT OUT 18 19 R22 R30 Stand-by Control
C11
R14
PCB Layout Example
C23
No. A1630-4/13
STK433-290-E
Recommended External Components
Parts Location R01, R23 Recommended value 100/1W Circuit purpose Resistance for ripple filter. (Fuse resistance is recommended. Ripple filter is constituted with C03, C23.) R02, R03, R04 R05, R06, R07 R08, R09, R10 R11, R12, R13 R14, R15, R16 R17, R18, R19 R20, R21, R22 R30 C01, C02 1k 56k 56k 1.8k 4.7 4.7/1W 0.22 10%, 5W Note*5 100F/100V Resistance for input filters. Input impedance is determined. Voltage gain (VG) is determined with R11, R12, R13 Voltage gain (VG) is determined with R8, R9, R10. (As for VG, it is desirable to set up by R11, R12, R13.) Noise absorption resistance. Resistance for oscillation prevention. Output emitter resistor (Metal-plate resistor is recommended.) rating. Capacitor for oscillation prevention. * Locate near the HIC as much as possible. * Power supply impedance is lowered and stable operation of the IC is carried out. (Electrolytic capacitor is recommended.) C03, C23 100F/100V Decoupling capacitor * The ripple ingredient mixed in an input side is removed from a power supply line. (Ripple filter is constituted with R03, R04.) C04, C05, C06 C07, C08, C09 2.2F/50V 470pF Input coupling capacitor. (for DC current prevention.) Input filter capacitor * A high frequency noise is reduced with the filter constituted by R02, R03, R04. C10, C11, C12 C13, C14, C15 3pF 10F/10V Capacitor for oscillation prevention. Negative feedback capacitor. * The cutoff frequency of a low cycle changes. (fL=1/(2 C13 R11)) It may oscillate. The voltage gain (VG) of low frequency is extended. However, the pop noise at the time of a power supply injection also becomes large. C16, C17, C18 C19, C20, C21 L01, L02, L03 0.1F 68pF 3H Capacitor for oscillation prevention. Capacitor for oscillation prevention. Coil for oscillation prevention. It may oscillate. It may oscillate. With especially no problem It may oscillate. The voltage gain (VG) of low frequency decreases. The change in the ripple ingredient mixed in an input side from a power supply line Output neutral voltage (VN) shift. (It is referred that R05=R08, R06=R09, R07=R10) It may oscillate. (VG<30dB) Decrease of maximum output Power runaway problem It may cause thrmal With especially no Above Recommended value Below Recommended value Short-through current may increase at high frequency. -
Select restriction resistance, for the impression voltage of `#17 (Stand-By) pin' must not exceed the maximum
No. A1630-5/13
STK433-290-E
STK433-100/-300sr PCB PARTS LIST
PCB Name: STK403-000Sr/100Sr/200Sr PCBA
Location No. (*2) 2ch Amp doesn't mount parts of ( ). Hybrid IC#1 Pin Position R01 R02, R03, (R04) R05, R06, (R07), R08, R09, (R10) R11, R12, (R13) R14, R15, (R16) R17, R18, (R19) R20, R21, (R22) C01, C02, C03, C23 C04, C05, (C06) C07, C08, (C09) C10, C11, (C12) C13, C14, (C15) C16, C17, (C18) C19, C20, (C21) R34, R35, (R36) L01, L02, (L03) Stand-By Control Circuit Tr1 D1 R30 R31 R32 R33 C32 J1, J2, J3, J4, J5, J6, J8, J9 J7, JS2, JS3, JS4, JS5, JS7, JS8, JS9 JS6, JS10 JS1 ERG1SJ101 (*4) (*3) ERG1SJ101 RN16S102FK RN16S563FK RN16S182FK RN14S4R7FK ERX1SJ4R7 Metal-plate resistor is recommended 100MV100HC 50MV2R2HC DD104-63B471K50 DD104-63CJ030C50 10MV10HC ECQ-V1H104JZ DD104-63B***K50 RN16S302FK 2SC3332 (Reference) GMB01(Reference) RN16S***FK RN16S333FK RN16S102FK RN16S202FK 10MV33HC 100, 1W 100F, 100V 2.2F, 50V 470pF, 50V 3pF, 50V 10F, 10V 0.1F, 50V ***pF, 50V 3k, 1/6W 3H VCE75V, IC1mA Di ***k, 1/6W 33k, 1/6W 1k, 1/6W 2k, 1/6W 33F, 10V 13k enabled enabled enabled enabled enabled enabled enabled 100pF Short enabled enabled enabled 2.7k 100, 1W 1k, 1/6W 56k, 1/6W 1.8k, 1/6W 4.7, 1/4W 4.7, 1W 0.22, 5W STK433-100Sr (*2) enabled enabled enabled enabled enabled enabled enabled enabled enabled (*1) enabled enabled enabled (*1) enabled 68pF STK433-300Sr PARTS RATING Component
(*1) Capacitor mark "A" side is "-" (negative). (*2) STK433-100Sr (2ch AMP) doesn't mount parts of ( ). (*3) Add parts C23 to the other side of PCB. (*4) Recommended standby circuit is used.
No. A1630-6/13
STK433-290-E
Pin Assignments
[STK433-000/-100/-200Sr & STK415/416-100Sr Pin Layout]
2ch class-AB (Size) 47.0x25.6x9.0 STK433-030-E 30W/JEITA STK433-040-E 40W/JEITA STK433-060-E 50W/JEITA STK433-070-E 60W/JEITA (Size) 67.0x25.6x9.0 STK433-090-E 80W/JEITA STK433-100-E 100W/JEITA STK433-120-E 120W/JEITA STK433-130-E 150W/JEITA 3ch class-AB (Size) 67.0x25.6x9.0 STK433-230A-E 30W/JEITA STK433-240A-E 40W/JEITA STK433-260A-E 50W/JEITA STK433-270-E 60W/JEITA (Size) 64.0x36.6x9.0 STK433-290-E 80W/JEITA STK433-300-E 100W/JEITA STK433-320-E 120W/JEITA STK433-330-E 150W/JEITA 2ch class-H (Size) 64.0x31.1x9.0 STK415-090-E 80W/JEITA STK415-100-E 90W/JEITA STK415-120-E 120W/JEITA STK415-130-E 150W/JEITA STK415-140-E 180W/JEITA + V L V L + O F F S E T 3ch class-H (Size) 64.0x31.1x9.0 STK416-090-E 80W/JEITA STK416-100-E 90W/JEITA STK416-120-E 120W/JEITA STK416-130-E 150W/JEITA + V L V L + O F F S E T O F F S E T P R E V H + V H O U T / C H 1 + O U T / C H 1 1 2 3 O F F S E T 4 5 6 7 P R E V H + V H O U T / C H 1 + 8 O U T / C H 1 9 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 P R E V C C + V C C O U T / C H 1 + O U T / C H 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 P R E V C C + V C C O U T / C H 1 + O U T / C H 1 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 2ch classAB/2.00mm O U T / C H 2 + O U T / C H 2 + P R E S U B * G N D G N D I N / C H 1 N F / C H 1 S T A N D | B Y N F / C H 2 I N / C H 2
3ch classAB/2.00mm O U T / C H 2 + O U T / C H 2 + P R E S U B * G N D G N D I N / C H 1 N F / C H 1 S T A N D | B Y N F / C H 2 I N / C H 2 I N / C H 3 N F / C H 3 O U T / C H 3 + O U T / C H 3 -
2ch classH/2.00mm O U T / C H 2 + 10 O U T / C H 2 11 12 + P R E S U B * G N D 13 14 15 16 G N D I N / C H 1 N F / C H 1 S T A N D | B Y 17 18 19 20 21 22 23 N F / C H 2 I N / C H 2
3ch classH/2.00mm O U T / C H 2 + O U T / C H 2 + P R E S U B * G N D G N D I N / C H 1 N F / C H 1 S T A N D | B Y N F / C H 2 I N / C H 2 I N / C H 3 N F / C H 3 O U T / C H 3 + O U T / C H 3 -
No. A1630-7/13
STK433-290-E
Evaluation Board Characteristics
Total power dissipation within the board, Pd - W
100 7 5 3 2
THD - PO
VCC=33V RL=6 VG=30dB 3ch Drive Rg=600 Tc=25C Ch1 measurement
140
Pd - PO
VCC=33V f=1kHz RL=6 VG=30dB Rg=600 Tc=25C 3ch Drive
Total harmonic distortion, THD - %
120
10 7 5 3 2 1.0 7 5 3 2 0.1 7 5 3 2 0.01 7 5 3 2 0.001 0.1
100
80
f=20kHz
60
40
f=1kHz
20 0 0.1
23
5 7 1.0
23
5 7 10
23
5 7 100
23
57 1000
ITF02732
23
5 7 1.0
23
5 7 10
23
5 7 100
23
5 71000
ITF02733
Output power, PO/ch - W
140
Output power, PO/ch - W
140
PO - VCC
PO - f
120
Output power, PO/ch - W
Output power, PO/ch - W
100
TH D= 10 %
RL=6 3ch Drive VG=30dB Rg=600 Tc=25C Ch1 measurement
120
80
60
40
(f 4% ) 0. Hz 0k D= 2 TH (f= .4% 0 D= TH
z) kH =1
100
VCC=33V RL=6 VG=30dB Rg=600 Tc=25C 3ch Drive Ch1 measurement
(f= 1k Hz )
THD=10% THD=0.4%
80
60
40
20 0 10
20 0 10
20
30
40
50
ITF02734
23
Supply voltage, VCC - V
5 7 100
23
5 7 1k
23
5 7 10k
23
5 7100k
ITF02735
Frequency, f - Hz
[Thermal Design Example for STK433-290-E (RL = 6)] The thermal resistance, c-a, of the heat sink for total power dissipation, Pd, within the hybrid IC is determined as follows. Condition 1: The hybrid IC substrate temperature, Tc, must not exceed 125C. Pd x c-a + Ta < 125C ................................................................................................. (1) Ta: Guaranteed ambient temperature for the end product Condition 2: The junction temperature, Tj, of each power transistor must not exceed 150C. Pd x c-a + Pd/N x j-c + Ta < 150C .......................................................................... (2) N: Number of power transistors j-c: Thermal resistance per power transistor However, the power dissipation, Pd, for the power transistors shall be allocated equally among the number of power transistors. The following inequalities result from solving equations (1) and (2) for c-a. c-a < (125 - Ta)/Pd ...................................................................................................... (1)' c-a < (150 - Ta)/Pd - j-c/N ........................................................................................ (2)' Values that satisfy these two inequalities at the same time represent the required heat sink thermal resistance. When the following specifications have been stipulated, the required heat sink thermal resistance can be determined from formulas (1)' and (2)'. * Supply voltage VCC * Load resistance RL * Guaranteed ambient temperature Ta
No. A1630-8/13
STK433-290-E
[Example] When the IC supply voltage, VCC, is 33V and RL is 6, the total power dissipation, Pd, within the hybrid IC, will be a maximum of 109.7W at 1kHz for a continuous sine wave signal according to the Pd-PO characteristics. For the music signals normally handled by audio amplifiers, a value of 1/8PO max is generally used for Pd as an estimate of the power dissipation based on the type of continuous signal. (Note that the factor used may differ depending on the safety standard used.) This is: Pd 85.0W (when 1/8PO max. = 10W, PO max. = 80W).
The number of power transistors in audio amplifier block of these hybrid ICs, N, is 6, and the thermal resistance per transistor, j-c, is 2.1C/W. Therefore, the required heat sink thermal resistance for a guaranteed ambient temperature, Ta, of 50C will be as follows. From formula (1)' c-a < (125 - 50)/85.0 < 0.88 From formula (2)' c-a < (150 - 50)/85.0 - 2.1/6 < 0.82 Therefore, the value of 0.82C/W, which satisfies both of these formulae, is the required thermal resistance of the heat sink. Note that this thermal design example assumes the use of a constant-voltage power supply, and is therefore not a verified design for any particular user's end product.
STK433-300series Stand-by Control & Mute Control & Load-Short Protection Application
(*1) The impression voltage of a Stand-by terminal (#13) is the maximum rating (VST max). Please set up not to exceed.
STK433-300 series
Ch1 -PRE -VCC +VCC OUT 1 2 3 4 56k 6.8k Ch1 OUT 5 Ch2 OUT 6 56k 6.8k 0.22/5W 0.22/5W Ch2 OUT +PRE SUB GND 7 8 9 10 Ch1 IN 11 Ch1 NF 12 ST- Ch2 BY NF 13 14 Ch2 IN 15 Ch3 IN 16 Ch3 NF 17 Ch3 Ch3 OUT OUT 18 19
1k
Stand-by Control(ex) H: Operation Mode(+5V) L: Stand-by Mode(0V)
33k 33F /10V 2k
0.22/5W
56k 6.8k
2.7k
56k
56k
Ch3 IN 10k Ch2 IN
Load Short Protection Circuit 22k 56k 1k 0.1F 100k 10k +VCC Latch Up Circuit
10k 10k 10k
GND Ch1 IN
2.2k
Ch3 OUT Ch2 OUT
Mute Control H: Single Mute L: Normal
GND GND GND -VCC GND Ch1 OUT Mute Control Stand-by Control
+5V +5V MUTE ST-BY SUB.GND PLAY MUTE ST-BY
No. A1630-9/13
STK433-290-E
[STK433-300 series Stand-By Control Using Example] Characteristic * It can largely improve a pop noise to occur in power supply ON/OFF by using recommended Stand-By Control Application. * Because It can perform Stand-By Control by regulating limit resistance to the voltage such as used microcomputers, a set design is easy. (ex) STK433-300series test circuit. When impressed by Stand-by control control [+5V].
1k Concerning pin 13 reference voltage VST 33k 2.7k(*1) Sink current IST 1
-PRE
Stand-by Control H: Operation Mode (+5V) L: Stand-by Mode (0V)
VBE 19
Ch3 OUT
33F (*3)
2k (*4)
2
-VCC
3
+VCC
4
Ch1 OUT
5
Ch1 OUT
6
Ch2 OUT
7
Ch2 OUT
8
+PRE
9
10
11
Ch1 IN
12
Ch1 NF
13
STBY
14
Ch2 NF
15
Ch2 IN
16
Ch3 IN
17
Ch3 NF
18
Ch3 OUT
SUB GND
STK433-300 series
VBE Bias Circuit in PreDriver IC
4.7k(*2)
ex) Stand-By control voltage=+5V VST=(5V-VBEx2)x4.7k/((*1)+4.7k)+VBE =(5V-0.6Vx2)x4.7k/(4.7k+2.7k)+0.6V 3.0(V)
Operation Explanation
(1) Concerning pin 13 reference voltage VST <1> Operation mode The SW transistor of bias circuit is turned on at VST2.5V, and the amplifier becomes operation mode. ex) VST=2.5V VST=(*2)xIST+0.6V2.5V=4.7kxIST+0.6V, IST0.40mA <2> Standby mode The SW transistor of Pre-driver IC is turned off at VST0.6V (typ0V), and the amplifier becomes Stand-By Mode. ex) VST=0.6V VST=(*2)xIST+0.6V0.6V=4.7kxIST+0.6V, IST0mA (*3) It can improve a pop noise at power up time by giving a time constant of the condenser during operation. (*4) Please decide a time constant to discharge the condenser during standby.
No. A1630-10/13
STK433-290-E
STK433-300-E series Stand-by control, Mute control, Load-short protection & DC offset protection application STK433-300-E series
Ch1 Ch2 Ch1 Ch2 -PRE -VCC +VCC OUT(+) OUT(-) OUT(+) OUT(-) +PRE SUB GND Ch1 IN Ch1 NF ST-BY Ch2 NF Ch2 IN Ch3 IN Ch3 NF Ch3 OUT Ch3 OUT (*1) The voltage applied to the Stand-by pin (#13) must not exceed the maximum rated value (VST max).
1
2
3
4
56k 6.8k
5
6
56k 6.8k
7
8
9
10
11
12
13
14
15
16
17
18
19
(*1) (ex) 2.7k
1k 33k 33F /10V
Stand-by Control (ex) H: Operation Mode (+5V) L: Stand-by Mode (0V)
0.22/5W
0.22/5W
0.22/5W
56k 6.8k
2k
56k
56k
Load short protection circuit 10k 22k 56k Latch up circuit 0.1F 1k (*4) R2 10k +VCC Ch3 OUT +5V 82k 82k GND GND -VCC Ch1 OUT DC offset protection ST-BY PLAY 82k 22F 100k MUTE 22F Stand-by Control Mute Control +5V 100k 2.2k
56k
Ch3 IN
Ch2 IN
10k
GND Ch1 IN
10k 10k
Mute Control H: Single Mute L: Normal
GND GND Ch2 OUT
MUTE
ST-BY
STK433-300-E Application Explanation STK433-300-E series
Point.B Ch1 Ch1 -PRE -VCC +VCC OUT(+) OUT(-) Ch2 Ch2 OUT(+) OUT(-) +PRE Stand-By Circuit in PreDriver IC SW transistor VBE Ch1 GND IN Operate mode (VSTOFF) 2.5V Stand-by mode (VSTON) 0.6V (0V typ)
4.7k Ch2 NF Ch2 IN Ch3 IN Ch3 Ch3 NF OUT(+) Ch3 OUT(-)
SUB
Ch1 NF ST-BY
1) Stand-by control circuit part H: Operation mode (+5V) L: Stand-by mode (0V) 1k (*1)R1 (ex) 2.7k 33k 33F 2k
1
2
3
56k
4
0.22/5W 6.8k
5
56k
6
6.8k
7
0.22/5W
8
9
10
11
12
13
14
15
16
17
18
19
IST
Stand-By Control Voltage VST
Tr1 56k
Tr2 56k 22k 56k I2 Tr4 0.1F 10k I3 1k (*4) R2 Tr1 56k Point.C 0.22/5W 56k 6.8k
Point.B
(2) Load short detection part
Point.C
100k -VCC (3) Latch-up circuit part
82k Ch1 OUT Ch2 OUT
82k
Tr5 Tr6 Ch3 OUT
22F 82k 22F 100k (4) DC offset protection
The protection circuit application for the STK433-300-Esr consists of the following blocks (blocks (1) to (4)). (1) Standby control circuit block (2) Load short-circuit detection block (3) Latch-up circuit block (4) DC voltage protection block
No. A1630-11/13
STK433-290-E
1) Stand-by control circuit block (Reference example) STK433-300-E series test circuit (when +5V is applied to Stand-by control.)
1k (*3) Stand-by Control Voltage H: Operation Mode (+5V) L: Stand-by Mode (0V) 2k (*3)
VST
(*1) R1 2.7k VBE
33k 33F (*2)
1
2
3
4
Ch1 OUT
5
Ch1 OUT
6
Ch2 OUT
7
8
9
SUB
10
GND
11
Ch1 IN
12
13
14
Ch2 NF
15
Ch2 IN
16
Ch3 IN
17
Ch3 NF
18
Ch3 OUT
19
Ch3 OUT
-PRE -VCC +VCC
Ch2 +PRE OUT
Ch1 ST-BY NF 4.7k
STK433-300-E series
VBE Stand-By Circuit in PreDriver IC
ex) Stand-By control voltage=+5V VST=(5V-VBEx2)x4.7k/((*1)+4.7k)+VBE =(5V-0.6Vx2)x4.7k/(4.7k+2.7k)+0.6V
3.0(V)
Concerning pin 13 reference voltage VST <1> Operation Mode The switching transistor in the bias circuit turns on and places the amplifier into the operating mode when the voltage flowing into pin 13 (VST) becomes 0.25V or greater. <2> Stand-By Mode When the voltage flowing into pin 13 (VST) is stopped (=0V), the switching transistor in the bias circuit turns off, placing the amplifier into the standby mode. (*1) The current limiting resistor (R1) must be used to ensure that the voltage flowing into the stand-by pin (pin 13) does not exceed its maximum rated value VST max. (*2) The pop noise level when the power is turned on can be reduced by setting the time constant with a capacitor in operating mode. (*3) Determines the time constant at which the capacitor (*2) is discharged in standby mode. 2) Load short detection block Since the voltage between point B and point C is less than 0.6V in normal operation mode (VBE < 0.6V) and TR1 (or TR2) is not activated, the load short-circuit detection block does not operate. When a load short-circuit occurs, however, the voltage between point B and point C becomes larger than 0.6V, causing TR1 (or TR2) to turn on (VBE > 0.6V), and current I2 to flows 3) Latch-up circuit block When I2 was supplied to latch-up circuit, TR3 operate. VST becomes Stand-By Mode (0V) when TR3 operates (I3 flows), the power amplifier is protected. Stand-By Mode is maintained when once TR3 operates because TR3 and TR4 compose the thyristor. It is necessary to make the Stand-By Control voltage (*2) L (0V) once to release Stand-By mode and to make the power amplifier operate again. After, when Stand-By Control (*2) is returned to H (ex, +5V), it operates again. (*4) I3 is changed depending on the power-supply voltage (-VCC). Please set resistance (R2) to become I1 < I3 by the following calculation types. I1 I3 = VCC/R2 4) DC offset protection block The DC offset protection circuit is activated when 0.5V (typ) voltage is applied to either "OUT CH1" or "OUT CH2," or "OUT CH3," and the hybrid IC is shut down (standby mode). To release the IC from the standby mode and reactivate the power amplifier, it is necessary to set the standby control voltage temporarily low (0V). Subsequently, when the standby control is returned to high (+5V, for example), the power amplifier will become active again. The protection level must be set using the 82k resistor. Furthermore, the time constant must be determined using 22//22 capacitors to prevent the amplifier from malfunctioning due to the audio signal.
No. A1630-12/13
STK433-290-E
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This catalog provides information as of February, 2010. Specifications and information herein are subject to change without notice.
PS No. A1630-13/13

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