Datasheet

ManualsBrandsSTMICROELECTRONICS ManualsLinear ICsLinear IC - Audio amplifier 2-channel (stereo) or 4-channel (Quad) Class AB Multiwatt 15

This is information on a product in full production.

April 2012 Doc ID 13907 Rev 6 1/25

STA540

4 x 13 W dual/quad power amplifier

Datasheet − production data

Features

■ High output power capability

– 2x 38 W into 4 Ω at 18 V, 1 kHz, 10% THD

– 2x 34 W into 8 Ω at 22 V, 1 kHz, 10% THD

– 2x 24W into 4Ω at 14.4 V, 1 kHz, 10% THD

– 2x 15 W into 8 Ω at 16 V, 1 kHz, 10% THD

– 4x 13 W into 2 Ω at 15 V, 1 kHz, 10% THD

– 4x 11 W into 4 Ω at 18 V, 1 kHz, 10% THD

– 4x 7 W into 4 Ω at 14.4 V, 1 kHz, 10% THD

■ Minimum external components count:

– no bootstrap capacitors

– no Boucherot cells

– internally fixed gain 20 dB

■ Standby function (CMOS compatible)

■ No audible pop during standby operations

■ Diagnostic facilities:

– clip detector

– output to GND short-circuit detector

– output to VS short-circuit detector

– soft short-circuit check at turn-on

– thermal shutdown warning

Protection

■ Output AC/DC short circuit

■ Soft short-circuit check at turn-on

■ Thermal cutoff/limiter to prevent chip from

overheating

■ High inductive loads

■ ESD

Description

The STA540 is a 4-channel, class-AB audio

amplifier designed for high quality sound

applications.

The amplifiers have single-ended outputs with

integrated short-circuit protection, thermal

protection and diagnostic functions.

The chip is housed in the 15-pin Multiwatt

ECOPACK

Pb-free package which is RoHS

(2002/95/EC) compliant.

Multiwatt15

Table 1. Device summary

Order code Temperature range Package Packing

STA540 -40 to 150° C Multiwatt15 Tube

www.st.com

Summary of content (25 pages)

PAGE 1
STA540 4 x 13 W dual/quad power amplifier Datasheet − production data Features ■ High output power capability – 2x 38 W into 4 Ω at 18 V, 1 kHz, 10% THD – 2x 34 W into 8 Ω at 22 V, 1 kHz, 10% THD – 2x 24W into 4Ω at 14.4 V, 1 kHz, 10% THD – 2x 15 W into 8 Ω at 16 V, 1 kHz, 10% THD – 4x 13 W into 2 Ω at 15 V, 1 kHz, 10% THD – 4x 11 W into 4 Ω at 18 V, 1 kHz, 10% THD – 4x 7 W into 4 Ω at 14.
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Contents STA540 Contents 1 2 Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 2.1 Absolute maximum ratings . . . . . . . . . .
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STA540 Contents 6.8 Handling the diagnostic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.9 PCB ground layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.10 Mute function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 7 Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 8 Revision history . . . . . . . . . . . . . . . . . . .
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List of tables STA540 List of tables Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. 4/25 Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8 Thermal data. .
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STA540 List of figures List of figures Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Figure 11. Figure 12. Figure 13. Figure 14. Figure 15. Figure 16. Figure 17. Figure 18. Figure 19. Figure 20. Figure 21. Figure 22. Figure 23. Figure 24. Figure 25. Figure 26. Figure 27. Figure 28. Figure 29. Figure 30. Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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Block diagram and pin description STA540 1 Block diagram and pin description 1.1 Block diagram Figure 1.
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STA540 1.2 Block diagram and pin description Pin description Figure 2. Pin connection (top view) OUT3 OUT3 OUT4 OUT4 15 14 VCC2 VCC IN3 IN3 13 12 IN4 IN4 DIAGNOSTICD DIAGNOSTICD 11 10 9 S-GND S-GND 8 P-GND PW-GND 7 ST-BY STAND-BY 6 SVR SVR 5 IN2 IN2 4 IN1 IN1 3 VCC1 VCC 2 OUT2 OUT2 1 OUT1 OUT1 D06au1631 Table 2.
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Electrical specifications STA540 2 Electrical specifications 2.1 Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit Supply voltage idle mode (no signal) 24 V Supply voltage operating 22 V Supply voltage AC-DC short safe 20 V Total power dissipation (Tcase = 85 °C) 36 W -40 to150 °C 0 to 70 °C Value Unit Rth j-case Thermal resistance junction to case (max) 1.
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STA540 Electrical specifications Table 5. Symbol CT Electrical characteristics (continued) Parameter Test condition f = 1 kHz single-ended f = 10 kHz single-ended f = 1 kHz BTL f = 10 kHz BTL Crosstalk Min Typ 70 60 60 Input impedance Single-ended BTL 20 10 30 15 Gv Voltage gain Single-ended BTL 19 25 20 26 Gv Voltage gain match Rgen = 0, "A" weighted, S.E.
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Standard application circuits 3 STA540 Standard application circuits Figure 3. Quadraphonic 10 kΩ ST_BY VS 100 nF 10 µF IN_1 4 7 13 3 1 220 nF OUT_1 2200 µF IN_2 5 STA540 220 nF IN_3 2 OUT_2 2200 µF 12 15 220 nF IN_4 11 6 8 OUT_3 2200 µF 220 nF 14 10 9 47 µF Figure 4.
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STA540 Standard application circuits Figure 6. Stereo plus bridge drive 10 kΩ ST_BY VS 100 nF 10 µF IN_L 4 7 13 3 1 220 nF IN_R 2200 µF 5 STA540 220 nF IN_Bridge 1000 µF 2 2200 µF 12 OUT_L OUT_R 15 470 nF OUT_Bridge 11 6 8 9 14 10 47 µF Suggested applications: 2x 9 W into 2 Ω, +1x 18 W into 4 Ω, at 12 V 2x 12 W into 2 Ω, +1x 26 W into 4 Ω, at 14.
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Electrical characteristics curves STA540 4 Electrical characteristics curves Figure 7. Quiescent drain current versus supply voltage (single-ended and bridge) Figure 9. Output power versus supply voltage Figure 10. Output power versus supply voltage 20 18 16 14 12 10 8 6 4 2 0 Po (W) THD= 10 % SINGLE ENDED RL= 2 Ω f= 1 KHz THD= 1 % 8 9 10 11 12 13 14 Vs (V) 15 16 17 18 Figure 8.
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STA540 Electrical characteristics curves Figure 13. Distortion versus output power Figure 14. Distortion versus output power Figure 15. Output power versus supply voltage Figure 16. Output power versus supply voltage Po(W) 35 12 Po(W) 32.5 11 30 S.E. 10 9 Rl=8ohm 25 f=1KHz 8 22.5 7 20 T.H.D=10% 6 f=1KHz T.H.D=10% 17.5 15 5 12.5 4 T.H.D=1% T.H.D=1% 10 3 7.5 2 5 1 2.5 0 BTL 27.
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Electrical characteristics curves STA540 Figure 19. Standby attenuation versus threshold voltage Figure 20. Total power dissipation and efficiency versus output power Figure 21.
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STA540 5 Thermal information Thermal information In order to avoid the intervention of the thermal protection, placed at Tj =150° C for thermal muting and Tj=160° C for thermal shutdown, it is important to calculate the heatsink thermal resistance, Rth_HS, correctly.
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Thermal information 5.1.3 STA540 Calculations using music power The thermal resistance value calculated in each of the two above examples specifies a heatsink capable of sustaining the maximum dissipated power. Realistically, however, and as explained in the Application Note (AN1965), the heatsink can be smaller when the application is musical content. When music power is considered the resulting dissipation is about 40% less than the calculated maximum.
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STA540 Practical information 6 Practical information 6.1 Highly flexible amplifier configuration The availability of four independent channels makes it possible to accomplish several kinds of applications ranging from four speakers stereo (F/R) to two-speaker bridge solutions. When working with single-ended configurations, the polarity of the speakers driven by the inverting amplifier must be reversed with respect to those driven by non-inverting channels.
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Practical information 6.6 STA540 Output stage The fully complementary output stage is possible with the power ICV PNP component. This novel design is based on the connection shown in Figure 22 and allows the full exploitation of its capabilities. The clear advantages this new approach has over classical output stages are described in the following sections. 6.6.
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STA540 Practical information 6.7 Built–in protection 6.7.1 Diagnostic facilities (pin 10) The STA540 is equipped with diagnostic circuitry that is able to detect the following events: ● clipping of the output signal, ● thermal shutdown, ● output fault: – short circuit to GND, – short circuit to VS, – soft short circuit at turn-on. The event is signalled when the open collector output of pin 10 begins to sink current. 6.7.
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Practical information 6.7.3 STA540 Clipping detection Figure 24. Clipping detection waveforms Current sinking at pin 10 occurs when a certain distortion level is reached at each output. This function initiates a gain-compression facility whenever the amplifier is overdriven. 6.7.4 Thermal shutdown With the thermal shutdown feature, the diagnostics output (pin 10) signals the closeness of the junction temperature to the shutdown threshold.
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STA540 6.8 Practical information Handling the diagnostic information As different diagnostic information (clipping detection, output fault, approaching thermal shutdown) becomes available at pin 10 so the behavior of the signal at this pin changes. In order to discriminate the event, signal DIAGNOSTICD, pin 10, must be interpreted correctly. Figure 27 shows a combination of events on the output waveform and the corresponding output on pin 10.
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Practical information 6.9 STA540 PCB ground layout The device has two distinct ground pins, P-GND (power ground) and S-GND (signal ground) which are disconnected from each other at chip level. For superior performance the pins P-GND and S-GND must be connected together on the PCB by low-resistance tracks. For the PCB-ground configuration, a star-like arrangement, where the center is represented by the supply-filtering electrolytic capacitor ground, is recommended.
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STA540 7 Package information Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK® packages, depending on their level of environmental compliance. ECOPACK® specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 30. Mechanical data and package dimensions (Multiwatt15) DIM. mm MIN. TYP. inch MAX. MIN. TYP. MAX. A 5 0.197 B 2.65 0.104 C 1.
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Revision history 8 STA540 Revision history Table 6.
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STA540 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries (“ST”) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST’s terms and conditions of sale.