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STA540
4 x 13 W dual/quad power amplifier
April 2012 Doc ID 13907 Rev 6 1/25
A5404 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 14.4V, 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 14.4V, 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
DescriptionThe 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.
Table 1. Device summary
Contents STA5402/25 Doc ID 13907 Rev 6
Contents Block diagram and pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 61.1 Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 82.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Standard application circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Thermal information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 155.1 Heatsink specification examples . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
5.1.1 Rth_HS calculation for 4 single-ended channels . . . . . . . . . . . . . . . . . . . 15
5.1.2 Rth_HS calculation for 2 single-ended channels plus 1 BTL channel . . . 15
5.1.3 Calculations using music power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Practical information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176.1 Highly flexible amplifier configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.2 Easy single-ended to bridge transition . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.3 Internally fixed gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.4 Silent turn on/off and muting/standby function . . . . . . . . . . . . . . . . . . . . . 17
6.5 Driving circuit for standby mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
6.6 Output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6.6.1 Rail-to-rail output voltage swing without bootstrap capacitors . . . . . . . . 18
6.6.2 Absolute stability without external compensation . . . . . . . . . . . . . . . . . 18
6.7 Built–in protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.7.1 Diagnostic facilities (pin 10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.7.2 Short-circuit protection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
6.7.3 Clipping detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.7.4 Thermal shutdown . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
STA540 ContentsDoc ID 13907 Rev 6 3/25
6.8 Handling the diagnostic information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6.9 PCB ground layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
6.10 Mute function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
List of tables STA540
4/25 Doc ID 13907 Rev 6
List of tables
Table 1. Device summary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Table 3. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. Thermal data. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STA540 List of figures
Doc ID 13907 Rev 6 5/25
List of figures
Figure 1. Block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 2. Pin connection (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3. Quadraphonic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 4. Alternative single-ended speaker connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 5. Dual bridge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 6. Stereo plus bridge drive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 7. Quiescent drain current versus supply voltage (single-ended and bridge). . . . . . . . . . . . . 12
Figure 8. Quiescent output voltage versus supply voltage (single-ended and bridge). . . . . . . . . . . . 12
Figure 9. Output power versus supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 10. Output power versus supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 11. Output power versus supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 12. Distortion versus output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 13. Distortion versus output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 14. Distortion versus output power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 15. Output power versus supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 16. Output power versus supply voltage. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 17. Supply voltage rejection versus frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 18. Crosstalk versus frequency . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 19. Standby attenuation versus threshold voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 20. Total power dissipation and efficiency versus output power. . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 21. Total power dissipation and efficiency versus output power. . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 22. The new output stage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 23. Shared capacitor in single-ended configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 24. Clipping detection waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 25. Output fault waveforms (see Figure 26) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 26. Fault waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Figure 27. Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 28. Interface circuit diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Figure 29. Optional mute function circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Figure 30. Mechanical data and package dimensions (Multiwatt15) . . . . . . . . . . . . . . . . . . . . . . . . . 23
Block diagram and pin description STA540
6/25 Doc ID 13907 Rev 6 Block diagram and pin description
1.1 Block diagram
Figure 1. Block diagram
STA540 Block diagram and pin description
Doc ID 13907 Rev 6 7/25
1.2 Pin description
Figure 2. Pin connection (top view)
Table 2. Pin description
Electrical specifications STA540
8/25 Doc ID 13907 Rev 6
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
2.3 Electrical characteristics
The test conditions are VS = 14.4 V, RL = 4 Ω, f = 1 kHz, Tamb = 25° C unless otherwise
specified.
Table 3. Absolute maximum ratings
Table 4. Thermal data
Table 5. Electrical characteristics
STA540 Electrical specifications
Doc ID 13907 Rev 6 9/25
Table 5. Electrical characteristics (continued)
Standard application circuits STA540
10/25 Doc ID 13907 Rev 6 Standard application circuits
Figure 3. Quadraphonic
Figure 4. Alternative single-ended speaker connection
Figure 5. Dual bridge
STA540 Standard application circuits
Doc ID 13907 Rev 6 11/25
Figure 6. Stereo plus bridge drive
Electrical characteristics curves STA540
12/25 Doc ID 13907 Rev 6 Electrical characteristics curves
Figure 7. Quiescent drain current versus
supply voltage (single-ended and
bridge)
Figure 8. Quiescent output voltage versus
supply voltage (single-ended and
bridge)
Figure 9. Output power versus supply voltage Figure 10. Output power versus supply voltage
Figure 11. Output power versus supply voltage Figure 12. Distortion versus output power
STA540 Electrical characteristics curves
Doc ID 13907 Rev 6 13/25
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
Figure 17. Supply voltage rejection versus
frequency
Figure 18. Crosstalk versus frequency
