Description. Order code Temperature range Package Packaging

Transcription

1 80 watt + 80 watt dual BTL class-d audio amplifier Features 80 W + 80 W output power at THD = 0% with R L = 6 Ω and V CC = 32 V 70 W + 70 W output power at THD = 0% with R L = 8 Ω and V CC = 34 V Wide-range single-supply operation (4-36 V) High efficiency (η = 90%) Four selectable, fixed gain settings of nominally 25.6 db, 3.6 db, 35. db and 37.6 db Differential inputs minimize common-mode noise Standby and mute features Short-circuit protection Thermal overload protection Externally synchronizable Description PowerSSO-36 with exposed pad up The is a dual BTL class-d audio amplifier with single power supply designed for home systems and active speaker applications. It comes in a 36-pin PowerSSO package with exposed pad up (EPU) to facilitate mounting a separate heatsink. Table. Device summary Order code Temperature range Package Packaging -40 to 85 C PowerSSO-36 (EPU) Tube TR -40 to 85 C PowerSSO-36 (EPU) Tape and reel September 20 Doc ID 6504 Rev 3 /

2 Contents Contents Pin description Pinout Pin list Electrical specifications Absolute maximum ratings Thermal data Recommended operating conditions Electrical specifications Characterizations Test circuit Characterization curves For R L = 6 Ω For R L = 8 Ω Applications information Applications circuit Mode selection Gain setting Input resistance and capacitance Internal and external clocks Master mode (internal clock) Slave mode (external clock) Output low-pass filter Protection functions Diagnostic output Package mechanical data Revision history /27 Doc ID 6504 Rev 3

3 List of figures List of figures Figure. Internal block diagram (showing one channel only) Figure 2. Pin connections (top view, PCB view) Figure 3. Test circuit for characterizations Figure 4. Test board Figure 5. Output power (THD = 0%) vs. supply voltage Figure 6. THD vs. output power Figure 7. THD vs. frequency ( W) Figure 8. THD vs. frequency (00 mw) Figure 9. Frequency response Figure 0. FFT performance (0 dbfs) Figure. FFT performance (-60 dbfs) Figure 2. Output power (THD = 0%) vs. supply voltage Figure 3. THD vs. output power Figure 4. THD vs. frequency ( W) Figure 5. THD vs. frequency (00 mw) Figure 6. Frequency response Figure 7. FFT performance (0 db) Figure 8. FFT performance (-60 db) Figure 9. Applications circuit for 6- or 8-Ω speakers Figure 20. Standby and mute circuits Figure 2. Turn on/off sequence for minimizing speaker pop Figure 22. Input circuit and frequency response Figure 23. Master and slave connection Figure 24. Typical LC filter for a 8-Ω speaker Figure 25. Typical LC filter for a 6-Ω speaker Figure 26. Behavior of pin DIAG for various protection conditions Figure 27. PowerSSO36 EPU outline drawing Doc ID 6504 Rev 3 3/27

4 List of tables List of tables Table. Device summary Table 2. Pin description list Table 3. Absolute maximum ratings Table 4. Thermal data Table 5. Recommended operating conditions Table 6. Electrical specifications Table 7. Mode settings Table 8. Gain settings Table 9. How to set up SYNCLK Table 0. PowerSSO-36 EPU dimensions Table. Document revision history /27 Doc ID 6504 Rev 3

5 Device block diagram Device block diagram Figure shows the block diagram of one of the two identical channels of the. Figure. Internal block diagram (showing one channel only) Doc ID 6504 Rev 3 5/27

6 Pin description 2 Pin description 2. Pinout Figure 2. Pin connections (top view, PCB view) 36 VSS SUB_GND 35 SVCC OUTPB 2 34 VREF OUTPB 3 33 INNB PGNDB 4 32 INPB PGNDB 5 3 GAIN PVCCB 6 30 GAIN0 PVCCB 7 29 SVR OUTNB 8 28 DIAG OUTNB 9 27 OUTNA 0 26 VDDS OUTNA 25 SYNCLK PVCCA 2 24 ROSC PVCCA 3 23 INNA PGNDA INPA MUTE EP, exposed pad Connect to ground PGNDA OUTPA STBY OUTPA 7 9 VDDPW PGND 8 6/27 Doc ID 6504 Rev 3

7 Pin description 2.2 Pin list Table 2. Pin description list Number Name Type Description SUB_GND PWR Connect to the frame 2,3 OUTPB O Positive PWM for right channel 4,5 PGNDB PWR Power stage ground for right channel 6,7 PVCCB PWR Power supply for right channel 8,9 OUTNB O Negative PWM output for right channel 0, OUTNA O Negative PWM output for left channel 2,3 PVCCA PWR Power supply for left channel 4,5 PGNDA PWR Power stage ground for left channel 6,7 OUTPA O Positive PWM output for left channel 8 PGND PWR Power stage ground 9 VDDPW O 20 STBY I Standby mode control 2 MUTE I Mute mode control 3.3-V (nominal) regulator output referred to ground for power stage 22 INPA I Positive differential input of left channel 23 INNA I Negative differential input of left channel 24 ROSC O Master oscillator frequency-setting pin 25 SYNCLK I/O Clock in/out for external oscillator 26 VDDS O 27 PWR Signal ground 28 DIAG O Open-drain diagnostic output 29 SVR O Supply voltage rejection 30 GAIN0 I Gain setting input 3 GAIN I Gain setting input V (nominal) regulator output referred to ground for signal blocks 32 INPB I Positive differential input of right channel 33 INNB I Negative differential input of right channel 34 VREF O Half VDDS (nominal) referred to ground 35 SVCC PWR Signal power supply decoupling 36 VSS O 3.3-V (nominal) regulator output referred to power supply - EP - Exposed pad for heatsink, to be connected to ground Doc ID 6504 Rev 3 7/27

8 Electrical specifications 3 Electrical specifications 3. Absolute maximum ratings Table 3. Absolute maximum ratings Symbol Parameter Value Unit V CC_MAX DC supply voltage for pins PVCCA, PVCCB 44 V V L_MAX Voltage limits for input pins STBY, MUTE, INNA, INPA, INNB, INPB, GAIN0, GAIN -0.3 to 3.6 V T j_max Operating junction temperature 0 to 50 C T stg Storage temperature -40 to 50 C Warning: Stresses beyond those listed under Absolute maximum ratings make cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated under Recommended operating condition are not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. In the real application, the power supply with the nominal value rated in the recommended operating conditions, may rise beyond the maximum operating condition for a short time when no or very low current is sunk (amplifier in mute state). In this case the reliability of the device is guaranteed, provided that the absolute maximum rating is not exceeded. 3.2 Thermal data Table 4. Thermal data Symbol Parameter Min Typ Max Unit R th j-case Thermal resistance, junction to case C/W 3.3 Recommended operating conditions Table 5. Recommended operating conditions Symbol Parameter Min Typ Max Unit V CC Supply voltage for pins PVCCA, PVCCB 4-36 V T amb Ambient operating temperature C 8/27 Doc ID 6504 Rev 3

9 Electrical specifications 3.4 Electrical specifications Unless otherwise stated, the results in Table 6 below are given for the conditions: V CC =32V, R L (load) = 6 Ω, R OSC = R3 = 39 kω, C8 = 00 nf, f = khz, G V = 25.6 db and Tamb = 25 C. Table 6. Electrical specifications Symbol Parameter Condition Min Typ Max Unit I q Total quiescent current No LC filter, no load ma I qstby Quiescent current in standby µa V OS Output offset voltage Play mode Mute mode I OCP Overcurrent protection threshold R L = 0 Ω A T js Junction temperature at thermal shutdown C R i Input resistance Differential input kω V OVP Overvoltage protection threshold V V UVP Undervoltage protection threshold V R dson P o P o Power transistor on resistance Output power Output power High side Low side THD = 0% THD = % R L = 8 Ω, THD = 0%, V CC = 32V mv Ω W W P P D Dissipated power o = 80 W + 80 W, W THD = 0% η Efficiency P o = 80 W + 80W % THD Total harmonic distortion P o = W % G V Closed-loop gain GAIN0 = L, GAIN = L GAIN0 = L, GAIN = H GAIN0 = H, GAIN = L GAIN0 = H, GAIN = H ΔG V Gain matching db CT Crosstalk f = khz, P o = W db en Total input noise A Curve, G V = 20 db f = 22 Hz to 22 khz SVRR Supply voltage rejection ratio fr = 00 Hz, Vr = 0.5 Vpp, C SVR = 0 µf db T r, T f Rise and fall times ns db µv Doc ID 6504 Rev 3 9/27

10 Electrical specifications Table 6. f SW Switching frequency Internal oscillator khz f SWR Electrical specifications (continued) Symbol Parameter Condition Min Typ Max Unit Output switching frequency Range With internal oscillator () With external oscillator (2) V inh Digital input high (H) V inl Digital input low (L) V STBY Pin STBY voltage high (H) Pin STBY voltage low (L) V MUTE Pin MUTE voltage high (H) Pin MUTE voltage low (L) A MUTE Mute attenuation V MUTE < 0.8 V db. f SW = 0 6 / ((6 * R OSC + 82) * 4) khz, f SYNCLK = 2 * f SW with R3 = 39 kω (see Figure 20.). 2. f SW = f SYNCLK / 2 with the external oscillator. khz V V V 0/27 Doc ID 6504 Rev 3

11 Characterization curves 4 Characterization curves Figure 20 on page 8 shows the test circuit with which the characterization curves, shown in the next sections, were measured. Figure 3 below shows the PCB layout. 4. PCB layout Figure 3. Test board Top view Top copper Bottom view Bottom copper Doc ID 6504 Rev 3 /27

12 Characterization curves 4.2 Characterization curves Unless otherwise stated the measurements were made under the following conditions: V CC = 32 V, f = khz, G V = 25.6 db, R OSC = 39 kω, C OSC = 00 nf, Tamb = 25 C 4.2. For R L = 6 Ω Figure 4. Output power vs. supply voltage Figure 5. THD vs. output power ( khz) % m 200m 500m W 2/27 Doc ID 6504 Rev 3

13 Characterization curves Figure 6. THD vs. output power (00 Hz) % m 200m 500m W Figure 7. THD vs. frequency ( W) % k 2k 5k 0k 20k Hz Figure 8. THD vs. frequency (00 mw) % k 2k 5k 0k 20k Hz Doc ID 6504 Rev 3 3/27

14 Characterization curves Figure 9. Frequency response d B r A k 2k 5k 0k 20k Hz Figure 0. FFT performance (0 dbfs) d B r A k 2k 5k 0k 20k Hz Figure. FFT performance (-60 dbfs) d B r A k 2k 5k 0k 20k Hz 4/27 Doc ID 6504 Rev 3

15 Characterization curves For R L = 8 Ω Figure 2. Output power vs. supply voltage Figure 3. THD vs. output power ( khz) % m 200m 500m W Doc ID 6504 Rev 3 5/27

16 Characterization curves Figure 4. THD vs. output power (00 Hz) % m 200m 500m W Figure 5. THD vs. frequency ( W) % k 2k 5k 0k 20k Hz Figure 6. THD vs. frequency (00 mw) % k 2k 5k 0k 20k Hz 6/27 Doc ID 6504 Rev 3

17 Characterization curves Figure 7. Frequency response d B r A k 2k 5k 0k 20k Hz Figure 8. FFT performance (0 dbfs) d B r A k 2k 5k 0k 20k Hz Figure 9. FFT performance (-60 dbfs) d B r A k 2k 5k 0k 20k Hz Doc ID 6504 Rev 3 7/27

18 3V3 Applications information 5 Applications information 5. Applications circuit Figure 20. Applications circuit J INPUT 3 L- 4 L+ 3V3 R- 2 R+ J4 FS C8 00nF For J7 Single-Ended R3 39K S2 MUTE 3 S STBY 3 C uf C2 uf Input C uf C2 uf 2 OUT IC2 IN L493CZ33 C uF 2 GND C9 00nF 2 3 3V3 POWER SUPPLY C5 00nF R7 22R C6 00nF C3 nf C4 nf FREQUENCY SHIFT 25 Q SYNCLK SYNC 2 R3 68k 24 ROSC FS R4 47k J5 30 GAIN0 R9 20K R4 20k R2 33k R8 VCC 6.8k D 8V C3 nf C4 nf SUB_GND 22 INPA 23 INNA 27 VDDS26 VDDS R 00k DIAG 28 DIAG 9 VDDPW 8 PGND VDDS 3 GAIN J6 For J8 35 SVCC Single-Ended Input C0 00nF 36 VSS 32 INPB 33 INNB 2 MUTE + C5 2.2uF 6V 20 STBY + C7 2.2uF 6V IC OUTPA OUTPA PGNDA PGNDA PVCCA PVCCA OUTNA OUTPB OUTPB PVCCB PVCCB PGNDB PGNDB OUTNB OUTNB SVR C25 00nF C9 00nF CLASS-D AMPLIFIER OUTNA VREF R6 22R C27 330pF R5 22R C2 330pF C7 0uF 0V C6 0uF 0V C30 uf C3 uf * * * * L4 22uH L3 22uH L 22uH L2 22uH C26 680nF C20 680nF * C28 220nF * * C24 220nF 2200uF C23+ 50V * C8 220nF * * C22 220nF R5 C40 220nF C4 220nF VCC 2 GND J2 C42 220nF C43 220nF OUTPUT Load=6 ohm L+ L- 2 R- 3 R+ 4 LC FILTER COMPONENT Load L,L2,L3,L4 C20,C26 C8,C22,C24,C28 6 ohm 22 uh 680 nf 220 nf 8 ohm 22 uh 470 nf 220 nf 8R R6 8R R7 8R R8 8R J3 5.2 Mode selection The three operating modes of the are set by the two inputs, STBY (pin 20) and MUTE (pin 2). Standby mode: all circuits are turned off, very low current consumption. Mute mode: inputs are connected to ground and the positive and negative PWM outputs are at 50% duty cycle. Play mode: the amplifiers are active. 8/27 Doc ID 6504 Rev 3

19 Applications information The protection functions of the are enabled by pulling down the voltages of the STBY and MUTE inputs shown in Figure 2. The input current of the corresponding pins must be limited to 200 µa. Table 7. Mode settings Mode STBY MUTE Standby L () Mute H () L Play H H. Drive levels defined in Table 6: Electrical specifications on page 9 X (don t care) Figure 2. Standby and mute circuits 0 V 0 V Standby 3.3 V R2 C7 30 kω 2.2 µf Mute 3.3 V R4 C5 30 kω 2.2 µf STBY MUTE Figure 22. Turn on/off sequence for minimizing speaker pop Doc ID 6504 Rev 3 9/27

20 Applications information 5.3 Gain setting The gain of the is set by the two inputs, GAIN0 (pin 30) and GAIN (pin 3). Internally, the gain is set by changing the feedback resistors of the amplifier. Table 8. Gain settings GAIN0 GAIN Nominal gain, G v (db) L L 25.6 L H 3.6 H L 35.6 H H Input resistance and capacitance The input impedance is set by an internal resistor Ri = 60 kω (typical). An input capacitor (Ci) is required to couple the AC input signal. The equivalent circuit and frequency response of the input components are shown in Figure 23. For Ci = 470 nf the high-pass filter cutoff frequency is below 20 Hz: f C = / (2 * π * Ri * Ci) Figure 23. Input circuit and frequency response Rf Input signal Ci Input pin Ri 20/27 Doc ID 6504 Rev 3

21 Applications information 5.5 Internal and external clocks The clock of the class-d amplifier can be generated internally or can be driven by an external source. If two or more class-d amplifiers are used in the same system, it is recommended that all devices operate at the same clock frequency. This can be implemented by using one as master clock, while the other devices are in slave mode, that is, externally clocked. The clock interconnect is via pin SYNCLK of each device. As explained below, SYNCLK is an output in master mode and an input in slave mode Master mode (internal clock) Using the internal oscillator, the output switching frequency, f SW, is controlled by the resistor, R OSC, connected to pin ROSC: f SW = 0 6 / ((R OSC * ) * 4) khz where R OSC is in kω. In master mode, pin SYNCLK is used as a clock output pin whose frequency is: f SYNCLK = 2 * f SW For master mode to operate correctly then resistor R OSC must be less than 60 kω as given below in Table Slave mode (external clock) In order to accept an external clock input the pin ROSC must be left open, that is, floating. This forces pin SYNCLK to be internally configured as an input as given in Table 9. The output switching frequency of the slave devices is: f SW = f SYNCLK / 2 Table 9. How to set up SYNCLK Mode ROSC SYNCLK Master R OSC < 60 kω Output Slave Floating (not connected) Input Figure 24. Master and slave connection Master Slave ROSC SYNCLK SYNCLK ROSC Output Input Cosc 00 nf Rosc 39 kω Doc ID 6504 Rev 3 2/27

22 Applications information 5.6 Output low-pass filter To avoid EMI problems, it may be necessary to use a low-pass filter before the speaker. The cutoff frequency should be larger than 22 khz and much lower than the output switching frequency. It is necessary to choose the L and C component values depending on the loudspeaker impedance. Some typical values, which give a cutoff frequency of 27 khz, are shown in Figure 25 and Figure 26 below. Figure 25. Typical LC filter for a 8-Ω speaker Figure 26. Typical LC filter for a 6-Ω speaker 22/27 Doc ID 6504 Rev 3

23 Applications information 5.7 Protection functions The is fully protected against overvoltages, undervoltages, overcurrents and thermal overloads as explained here. Overvoltage protection (OVP) If the supply voltage exceeds the value for V OVP given in Table 6: Electrical specifications on page 9 the overvoltage protection is activated which forces the outputs to the high-impedance state. When the supply voltage falls back to within the operating range, the device restarts. Undervoltage protection (UVP) If the supply voltage drops below the value for V UVP given in Table 6: Electrical specifications on page 9 the undervoltage protection is activated which forces the outputs to the high-impedance state. When the supply voltage recovers to within the operating range, the device restarts. Overcurrent protection (OCP) If the output current exceeds the value for I OCP given in Table 6: Electrical specifications on page 9 the overcurrent protection is activated which forces the outputs to the high-impedance state. Periodically, the device attempts to restart. If the overcurrent condition is still present then the OCP remains active. The restart time, T OC, is determined by the R-C components connected to pin STBY. Thermal protection (OTP) If the junction temperature, T j, reaches 45 C (nominally), the device goes to mute mode and the positive and negative PWM outputs are forced to 50% duty cycle. If the junction temperature reaches the value for T j given in Table 6: Electrical specifications on page 9 the device shuts down and the output is forced to the high-impedance state. When the device cools sufficiently, the device restarts. 5.8 Diagnostic output The output pin DIAG is an open-drain transistor. When any protection is activated it switches to the high-impedance state. The pin can be connected to a power supply (< 36 V) by a pullup resistor whose value is limited by the maximum sinking current (200 µa) of the pin. Figure 27. Behavior of pin DIAG for various protection conditions VDD R DIAG Protection logic VDD Restart Restart Overcurrent protection OV, UV, OT protection Doc ID 6504 Rev 3 23/27

24 Package mechanical data 6 Package mechanical data The comes in a 36-pin PowerSSO package with exposed pad up. Figure 28 shows the package outline and Table 0 gives the dimensions. Table 0. Symbol PowerSSO-36 EPU dimensions Dimensions in mm Dimensions in inches Min Typ Max Min Typ Max A A a b c D E e e F G H h k 0-8 degrees degrees L M N degrees degrees O Q S T U X Y 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: ECOPACK is an ST trademark. 24/27 Doc ID 6504 Rev 3

25 h x 45 Package mechanical data Figure 28. PowerSSO-36 EPU outline drawing Doc ID 6504 Rev 3 25/27

26 Revision history 7 Revision history Table. Document revision history Date Revision Changes 04-Dec-2009 Initial release. 02-Jul Removed datasheet preliminary status, updated features list and updated Device summary table on page Updated minimum supply voltage and temperature range in Table 5: Recommended operating conditions on page 8 Updated typical power output for 8 Ω at 32 V in Table 6: Electrical specifications on page 9 2-Sep-20 3 Updated OUTNA in Table 2: Pin description list; minor textual updates 26/27 Doc ID 6504 Rev 3

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