STPA002 STM | Alldatasheet
Document overview
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- PDF pages: 24
Technical content
Datasheet sections
- 1 Overview
- 1.1 Block diagram
- 1.2 Application circuits
- 2 Pin description
- 3 Electrical specifications
- 3.1 Absolute maximum ratings
- 3.2 Thermal data
- 3.3 Electrical characteristics
- 4 Electrical characteristics typical curves
- 5 General information
- 5.1 Operation
- 5.2 Battery variations
- 5.2.1 Low voltage operation
- 5.2.2 Cranks
- 5.2.3 Advanced battery management (hybrid vehicles)
- 5.3 Protections
- 5.3.1 Short circuits and open circuit operation
- 5.3.2 Over-voltage and load dump protection
- 5.3.3 Thermal protection
- 5.4 Warnings
- 5.4.1 DC offset detection (OD pin)
- 5.4.2 Clipping detection and diagnostics (CD-DIAG pin)
- 5.5 Heat sink definition
- 6 Package information
- 7 Revision history
Features
High output power capability: – 4 x 52 W/4 Ω max. – 4 x 30 W/4 Ω @ 14.4 V, 1 kHz, 10 % – 4 x 85 W/2 Ω max. – 4 x 55 W/2 Ω @ 14.4V, 1 kHz, 10 % MOSFET output power stage Stop-start and hybrid engines compliant Excellent 2 driving capability Hi-Fi class distortion Low output noise Standby function and mute function Automute at min. supply voltage detection Low external component count: – Internally fixed gain (26 dB) – No external compensation – No bootstrap capacitors Protections: – Output short circuit to GND, to V s, across the load – Very inductive loads – Overrating chip temperature with soft thermal limiter – Output DC offset detection – Load dump voltage – Fortuitous open GND – Reverse battery – ESD
Description
The STPA002 is a MOSFET class AB audio power amplifier, designed for high-power car radio. In addition to the outstanding output current capability and distortion performance, the STPA002 is extremely robust against several kinds of fortuitous misconnections. It is compliant to the most recent OEM specifications for low voltage operation in start- stop vehicles, and can sustain hybrid vehicles battery transitions. It includes a DC offset detector and, in Flexiwatt27 package, a clipping detector. '!0'03 '!0'03 Flexiwatt25 Flexiwatt27 Table 1. Device summary
1 Overview
play during battery transitions. circuit, over-voltage and over-temperature.
1.1 Block diagram
Figure 1. Block diagram
1.2 Application circuits
Figure 2. Standard test and application circuit (Flexiwatt25) Figure 3. Standard test and application circuit (Flexiwatt27)
2 Pin description
Figure 4. Pin connections (top view)
Table 2. Pin functions
3 Electrical specifications
3.1 Absolute maximum ratings
3.2 Thermal data
3.3 Electrical characteristics
Tamb = 25 °C; unless otherwise specified. Table 3. Absolute maximum ratings Table 4. Thermal data Table 5. Electrical characteristics
Table 5. Electrical characteristics (continued)
- Saturated square wave output
- Clipping detection is guaranteed till a minimum supply voltage of 7 V.
4 Electrical characteristics typical curves
Figure 5. Quiescent current vs. supply voltage Figure 6. Output power vs. supply voltage (4 Ω) Figure 7. Output power vs. supply voltage (2 Ω) Figure 8. Distortion vs. output power (4 Ω) Figure 9. Distortion vs. output power (2 Ω) Figure 10. Distortion vs. frequency (4 Ω)
5 General information
5.1 Operation
performances (see Figure 2: Standard test and application circuit (Flexiwatt25)). Standby and mute pins are 3.3 V and 5 V compatible. is suggested for the stand-by pin and 0.5 V/ms for the mute pin. capacitor on SVR is charged very quickly to VCC/4, as shown in the following figure. Figure 20. SVR charge diagram discharged or charged consequently.
5.2 Battery variations
5.2.1 Low voltage operation
voltage returns to the correct voltage.
5.2.2 Cranks
allowed battery transitions. Figure 21. Battery cranking curve example 1
Figure 22. Battery cranking curve example 2
5.2.3 Advanced battery management (hybrid vehicles)
Figure 23. Upwards fast battery transitions diagram
5.3 Protections
5.3.1 Short circuits and open circuit operation
condition until the short is removed. only when the output returns inside the limits imposed by an internal voltage comparator. the check is repeated every 150 μs.
5.3.2 Over-voltage and load dump protection
state. It stops playing till the supply voltage returns in the permitted range. rising time lower than 5 ms (see Figure 24). Figure 24. Load dump protection diagram
5.3.3 Thermal protection
Figure 25. Thermal protection diagram
5.4 Warnings
5.4.1 DC offset detection (OD pin)
the power amplifier has to be un-muted with no input signal. (typ), the OD pin is pulled down.
5.4.2 Clipping detection and diagnostics (CD-DIAG pin)
clipping. Thanks to a particular internal circuitry, the clip detector is always functional till 7 V. ground till these shorts are present to inform the user a protection occurred. down to notify this occurrence. Figure 26. Audio section waveforms
General information STPA002
5.5 Heat sink definition
Assuming we have a dissipated power of 26 W (e.g. in the worst case situation of frequent clipping occurrence, with music signal), considering Tj max is 150 °C and assuming ambient temperature is 70 °C, the available temperature gap for a correct dissipation is 80 °C. This means the thermal resistance of the system Rth has to be 80 °C/26 W = 3 °C/W. The junction to case thermal resistance is 1 °C/W. So the heat sink thermal resistance should be approximately 2 °C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation.
6 Package information
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 27. Flexiwatt25 (vertical) mechanical data and package dimensions
Figure 28. Flexiwatt27 (Vertical) mechanical data and package dimensions
7 Revision history
Table 6. Document revision history 14-Mar-2013 1 Initial release. 18-Sep2013 3 Updated Disclaimer.