TDA7560_V01 STMICROELECTRONICS | Alldatasheet
Document overview
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- PDF pages: 17
Technical content
Datasheet sections
- 1 Block and pin connection diagram
- 2 Electrical specifications
- 2.1 Absolute maximum ratings
- 2.2 Thermal data
- 2.3 Electrical characteristics
- 2.4 Standard test and application circuit, and PCB layout
- 2.5 Electrical characteristics curves
- 3 Application hints
- 3.1 SVR
- 3.2 Input stage
- 3.3 Standby and muting
- 3.4 DC offset detector
- 3.5 Heatsink definition
- 4 Package information
- 5 Revision history
Features
■ Superior output power capability: –4 x 5 1 W / 4 max. –4 x 4 5 W / 4 EIAJ –4 x 3 0 W / 4 @ 14.4 V, 1 kHz, 10 % –4 x 8 0 W / 2 max. –4 x 7 7 W / 2 EIAJ –4 x 5 5 W / 2 @ 14.4 V, 1 kHz, 10 % ■ Multipower BCD technology ■ MOSFET output power stage ■ Excellent 2 driving capability ■ Hi-Fi class distortion ■ Low output noise ■ Standby function ■ Mute function ■ Automute at min. supply voltage detection ■ Low external component count: – Internally fixed gain (26 dB) – No external compensation – No bootstrap capacitors ■ On board 0.35 A high side driver ■ 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 – Reversed battery – ESD
Description
The TDA7560 is a breakthrough BCD (Bipolar / CMOS / DMOS) technology class AB audio power amplifier in Flexiwatt 25 package designed for high power car radio. The fully complementary P-Channel/N-Channel output structure allows a rail to rail output voltage swing which, combined with high output current and minimized saturation losses sets new power references in the car-radio field, with unparalleled distortion performances. '!0'03'!0'03 Flexiwatt25 (horizontal) Flexiwatt25 (vertical) Table 1. Device summary
1 Block and pin connection diagram
Figure 1. Block diagram Figure 2. Pins connection (top view)
2 Electrical specifications
2.1 Absolute maximum ratings
2.2 Thermal data
2.3 Electrical characteristics
= 25 °C; unless otherwise specified. Table 2. Absolute maximum ratings Table 3. Thermal data Table 4. Electrical characteristics
Table 4. Electrical characteristics (continued)
2.4 Standard test and application circuit, and PCB layout
Figure 3. Standard test and application circuit
- Saturated square wave output.
Figure 4. PCB and component layout of the Figure 3.
2.5 Electrical characteristics curves
Figure 5. Quiescent current vs. supply Figure 6. Output power vs. supply voltage Figure 7. Output power vs. supply voltage Figure 8. Distortion vs. output power Figure 9. Distortion vs. output power Figure 10. Distortion vs. frequency (R L =4 )
3 Application hints
(ref. to the circuit of Figure 3)
3.1 SVR
Besides its contribution to the ripple rejection, the SVR capacitor governs the turn ON/OFF time sequence and, consequently, plays an essential role in the pop optimization during ON/OFF transients.To conveniently serve both needs, ITS MINIMUM RECOMMENDED VALUE IS 10 µF.
3.2 Input stage
The TDA7560's inputs are ground-compatible and can stand very high input signals (±8 Vpk) without any performances degradation. If the standard value for the input capacitors (0.1µF) is adopted, the low frequency cut-off will amount to 16 Hz.
3.3 Standby and muting
Standby and Muting facilities are both CMOS-compatible. In absence of true CMOS ports or microprocessors, a direct connection to Vs of these two pins is admissible but a 470 kOhm equivalent resistance should be present between the power supply and the muting and ST -BY pins. R-C cells have always to be used in order to smooth down the transitions for preventing any audible transient noises. About the standby, the time constant to be assigned in order to obtain a virtually pop-free transition has to be slower than 2.5 V/ms.
3.4 DC offset detector
The TDA7560 integrates a DC offset detector to avoid that an anomalous DC offset on the inputs of the amplifier may be multiplied by the gain and result in a dangerous large offset on the outputs which may lead to speakers damage for overheating. The feature is enabled by the MUTE pin (according to Table 4) and works with the amplifier unmuted and with no signal on the inputs. The DC offset detection is signaled out on the HSD pin. To ensure the correct functionality of the Offset Detector it is necessary to connect a pulldown 10 k resistor between HSD and ground.
3.5 Heatsink definition
Under normal usage (4 Ohm speakers) the heatsink's thermal requirements have to be deduced from Figure 17, which reports the simulated power dissipation when real music/speech programmes are played out. Noise with gaussian-distributed amplitude was employed for this simulation. Based on that, frequent clipping occurrence (worst-case) will cause P diss = 26 W. Assuming Tamb = 70 °C and TCHIP = 150 °C as boundary conditions, the heatsink's thermal resistance should be approximately 2 °C/W. This would avoid any thermal shutdown occurrence even after long-term and full-volume operation
4 Package information
specifications, grade definitions and product status are available at: www.st.com. ECOPACK® is an ST trademark. Figure 20. Flexiwatt25 (vertical) mechanical data and package dimensions
Figure 21. Flexiwatt25 (horizontal) mechanical data and package dimensions
5 Revision history
Table 5. Document revision history 20-Dec-2001 1 Initial release. Added new order code in Flexiwatt25 horizontal package. Updated Figure 3: Standard test and application circuit. Updated Table 4: Electrical characteristics. Updated Section 2.3: Electrical characteristics. 16-Sep-2013 6 Updated Disclaimer.