TS4962 2.8 W filter-free mono class D audio power amplifier Features DFN8 3 x 3 mm ■ Operating from VCC = 2.4 V to 5.5 V ■ Standby mode active low ■ Output power: 2.8 W into 4 Ω and 1.7 W into 8 Ω with 10% THD+N maximum and 5 V power supply ■ Output power: 2.2 W at 5 V or 0.7 W at 3.0 V into 4 Ω with 1% THD+N maximum ■ Output power: 1.4 W at 5 V or 0.5 W at 3.
Contents TS4962 Contents 1 Absolute maximum ratings and operating conditions . . . . . . . . . . . . . 3 2 Application overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 3.1 4 Electrical characteristics curves . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Application information . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TS4962 1 Absolute maximum ratings and operating conditions Absolute maximum ratings and operating conditions Table 1.
Absolute maximum ratings and operating conditions Table 3. Operating conditions Symbol VCC VIC VSTBY RL Rthja TS4962 Parameter Supply voltage (1) Common mode input voltage range (2) Standby voltage input: (3) Device ON Device OFF Value Unit 2.4 to 5.5 V 0.5 to VCC-0.8 V 1.4 ≤ VSTBY ≤ VCC GND ≤ VSTBY ≤ 0.4 (4) Load resistor ≥4 Ω Thermal resistance junction to ambient DFN8 package (5) 50 °C/W 1. For VCC between 2.4 V and 2.5 V, the operating temperature range is reduced to 0°C ≤Tamb 2.
TS4962 2 Application overview Application overview Table 4. External component information Component Functional description CS Bypass supply capacitor. Install as close as possible to the TS4962 to minimize high-frequency ripple. A 100 nF ceramic capacitor should be added to enhance the power supply filtering at high frequencies. Rin Input resistor used to program the TS4962’s differential gain (gain = 300 kΩ/Rin with Rin in kΩ). Input capacitor Table 5.
Application overview Figure 1.
TS4962 3 Electrical characteristics Electrical characteristics Table 6. Electrical characteristics at VCC = +5 V, with GND = 0 V, Vicm = 2.5 V, and Tamb = 25°C (unless otherwise specified) Symbol Typ. Max. Unit Supply current No input signal, no load 2.3 3.
Electrical characteristics Table 6. TS4962 Electrical characteristics at VCC = +5 V, with GND = 0 V, Vicm = 2.5 V, and Tamb = 25°C (unless otherwise specified) (continued) Symbol Parameter VN Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB Min. Typ.
TS4962 Electrical characteristics Table 7. Electrical characteristics at VCC = +4.2 V with GND = 0 V, Vicm = 2.1 V and Tamb = 25°C (unless otherwise specified)(1) Symbol Typ. Max. Unit Supply current No input signal, no load 2.
Electrical characteristics Table 7. TS4962 Electrical characteristics at VCC = +4.2 V with GND = 0 V, Vicm = 2.1 V and Tamb = 25°C (unless otherwise specified)(1) (continued) Symbol Parameter VN Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB Min. Typ.
TS4962 Electrical characteristics Table 8. Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V, Tamb = 25°C (unless otherwise specified)(1) Symbol Typ. Max. Unit Supply current No input signal, no load 2 2.
Electrical characteristics Table 8. Symbol VN TS4962 Electrical characteristics at VCC = +3.6 V with GND = 0 V, Vicm = 1.8 V, Tamb = 25°C (unless otherwise specified)(1) (continued) Parameter Min. Typ. Max.
TS4962 Electrical characteristics Table 9. Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V, Tamb = 25°C (unless otherwise specified)(1) Symbol Typ. Max. Unit Supply current No input signal, no load 1.9 2.
Electrical characteristics Table 9. Symbol VN TS4962 Electrical characteristics at VCC = +3.0 V with GND = 0 V, Vicm = 1.5 V, Tamb = 25°C (unless otherwise specified)(1) (continued) Parameter Min. Typ. Max.
TS4962 Electrical characteristics Table 10. Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25V, Tamb = 25°C (unless otherwise specified) Symbol Typ. Max. Unit Supply current No input signal, no load 1.7 2.
Electrical characteristics Table 10. Symbol VN TS4962 Electrical characteristics at VCC = +2.5 V with GND = 0 V, Vicm = 1.25V, Tamb = 25°C (unless otherwise specified) (continued) Parameter Min. Typ. Max.
TS4962 Electrical characteristics Table 11. Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V, Tamb = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. Max. Unit Supply current No input signal, no load 1.
Electrical characteristics Table 11. TS4962 Electrical characteristics at VCC +2.4 V with GND = 0 V, Vicm = 1.2 V, Tamb = 25°C (unless otherwise specified) (continued) Symbol Parameter VN Output voltage noise f = 20 Hz to 20 kHz, G = 6 dB Typ.
TS4962 3.1 Electrical characteristics Electrical characteristics curves The graphs shown in this section use the following abbreviations. ● RL + 15 μH or 30 μH = pure resistor + very low series resistance inductor ● Filter = LC output filter (1 µF + 30 µH for 4 Ω and 0. 5µF + 60 µH for 8 Ω) All measurements are done with CS1 = 1 µF and CS2 = 100 nF (see Figure 2), except for the PSRR where CS1 is removed (see Figure 3). Figure 2.
Electrical characteristics TS4962 Current consumption vs. power supply voltage Figure 4. Figure 5. 2.5 2.5 Current Consumption (mA) Current Consumption (mA) No load Tamb=25°C 2.0 1.5 1.0 0.5 0.0 2.0 1.5 1.0 0.5 0.0 0 Current consumption vs. standby voltage 1 2 3 4 5 Vcc = 5V No load Tamb=25°C 0 1 2 Figure 6. Current consumption vs. standby voltage 4 5 Output offset voltage vs. common mode input voltage Figure 7. 2.0 10 G = 6dB Tamb = 25°C 8 1.
TS4962 Electrical characteristics Figure 10. Efficiency vs. output power Figure 11. Efficiency vs. output power 75 100 100 100 60 40 Power Dissipation 50 Vcc=5V RL=8Ω + ≥ 15μH F=1kHz THD+N≤1% 20 0 0.0 0.2 0.4 0.6 0.8 Output Power (W) 1.0 80 Efficiency 0.2 0.3 Output Power (W) 0 0.5 0.4 RL = 8Ω + ≥ 15μH F = 1kHz BW < 30kHz Tamb = 25°C THD+N=10% Output power (W) Output power (W) 2.0 RL = 4Ω + ≥ 15μH F = 1kHz BW < 30kHz Tamb = 25°C 0.
Electrical characteristics TS4962 Figure 16. PSRR vs. frequency Figure 17. PSRR vs. frequency 0 0 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + Filter ΔR/R≤0.1% Tamb = 25°C PSRR (dB) -20 -30 -20 -40 Vcc=5V, 3.6V, 2.5V -50 -40 Vcc=5V, 3.6V, 2.5V -50 -60 -70 -70 20 100 1000 Frequency (Hz) -80 10000 20k Figure 18. PSRR vs. frequency 100 1000 Frequency (Hz) 10000 20k 0 Vripple = 200mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 8Ω + 30μH ΔR/R≤0.
TS4962 Electrical characteristics Figure 22. CMRR vs. frequency Figure 23. CMRR vs. frequency 0 0 CMRR (dB) -20 -20 Vcc=5V, 3.6V, 2.5V -40 -60 100 20 1000 Frequency (Hz) 10000 20k Figure 24. CMRR vs. frequency 10000 20k 0 RL=8Ω + 15μH G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C RL=8Ω + 30μH G=6dB ΔVicm=200mVpp ΔR/R≤0.1% Cin=4.7μF Tamb = 25°C -20 Vcc=5V, 3.6V, 2.5V -40 -60 Vcc=5V, 3.6V, 2.5V -40 -60 20 100 1000 Frequency (Hz) 10000 20k Figure 26. CMRR vs.
Electrical characteristics TS4962 Figure 28. THD+N vs. output power Figure 29. THD+N vs. output power 10 Vcc=2.5V 0.1 1 0.01 0.1 Output Power (W) 1 3 Figure 30. THD+N vs. output power 0.01 1E-3 Vcc=5V Vcc=3.6V Vcc=2.5V 1 THD + N (%) THD + N (%) 0.01 0.1 Output Power (W) 1 3 RL = 8Ω + 30μH or Filter F = 100Hz G = 6dB BW < 30kHz Tamb = 25°C Vcc=5V Vcc=3.6V Vcc=2.5V 0.1 0.01 1E-3 0.01 0.1 Output Power (W) 1 2 Figure 32. THD+N vs. output power 0.01 1E-3 0.01 0.
TS4962 Electrical characteristics Figure 34. THD+N vs. output power Figure 35. THD+N vs. output power 1 10 RL = 8Ω + 15μH F = 1kHz G = 6dB BW < 30kHz Tamb = 25°C Vcc=3.6V Vcc=2.5V 1E-3 0.01 0.1 Output Power (W) 1 1E-3 2 Figure 36. THD+N vs. frequency 0.01 0.1 Output Power (W) 1 THD + N (%) Po=1.4W RL=4Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=5V Tamb = 25°C 50 100 1000 Frequency (Hz) 10000 20k 0.01 Po=1.4W 100 50 1000 Frequency (Hz) 10000 20k Figure 39. THD+N vs.
Electrical characteristics TS4962 Figure 40. THD+N vs. frequency Figure 41. THD+N vs. frequency 10 1 Po=0.35W THD + N (%) THD + N (%) 1 10 RL=4Ω + 15μH G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C 0.1 RL=4Ω + 30μH or Filter G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C Po=0.35W 0.1 Po=0.17W 0.01 50 100 1000 Frequency (Hz) Po=0.17W 10000 20k Figure 42. THD+N vs. frequency 0.01 1000 Frequency (Hz) Po=0.85W 1 0.
TS4962 Electrical characteristics Figure 46. THD+N vs. frequency Figure 47. THD+N vs. frequency 10 10 RL=8Ω + 15μH G=6dB Bw < 30kHz Vcc=2.5V Tamb = 25°C 1 Po=0.18W THD + N (%) THD + N (%) 1 Po=0.1W 0.1 0.01 50 100 1000 Frequency (Hz) 10000 20k 0.01 6 6 Vcc=5V, 3.6V, 2.5V RL=4Ω + 15μH G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 20 100 10000 20k Figure 50. Gain vs. frequency 20 6 Differential Gain (dB) 6 0 Vcc=5V, 3.6V, 2.
Electrical characteristics TS4962 Figure 53. Gain vs. frequency 8 8 6 6 Differential Gain (dB) Differential Gain (dB) Figure 52. Gain vs. frequency Vcc=5V, 3.6V, 2.5V 4 RL=8Ω + 30μH G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 2 0 Vcc=5V, 3.6V, 2.5V 4 0 20 100 1000 Frequency (Hz) 10000 20k Figure 54. Gain vs. frequency RL=8Ω + Filter G=6dB Vin=500mVpp Cin=1μF Tamb = 25°C 2 20 100 1000 Frequency (Hz) 10000 20k Figure 55.
TS4962 Electrical characteristics Figure 59. Startup and shutdown times Figure 58. Startup and shutdown times VCC = 5V, G = 6dB, No Cin (5ms/div) VCC = 3V, G = 6dB, Cin= 100nF (5ms/div) Vo1 Vo1 Vo2 Vo2 Standby Standby Vo1-Vo2 Vo1-Vo2 Figure 60.
Application information TS4962 4 Application information 4.1 Differential configuration principle The TS4962 is a monolithic, fully differential input/output class D power amplifier. The TS4962 also includes a common-mode feedback loop that controls the output bias value to average it at VCC/2 for any DC common-mode input voltage. This allows the device to always have a maximum output voltage swing, and by consequence, maximize the output power.
TS4962 4.3 Application information Common-mode feedback loop limitations As explained previously, the common-mode feedback loop allows the output DC bias voltage to be averaged at VCC/2 for any DC common-mode bias input voltage. However, due to a Vicm limitation in the input stage (see Table 3: Operating conditions on page 4), the common-mode feedback loop can play its role only within a defined range. This range depends upon the values of VCC and Rin (AVdiff).
Application information 4.5 TS4962 Decoupling of the circuit A power supply capacitor, referred to as CS, is needed to correctly bypass the TS4962. The TS4962 has a typical switching frequency at 250 kHz and output fall and rise time about 5 ns. Due to these very fast transients, careful decoupling is mandatory. A 1 µF ceramic capacitor is enough, but it must be located very close to the TS4962 in order to avoid any extra parasitic inductance being created by an overly long track wire.
TS4962 Single-ended input configuration It is possible to use the TS4962 in a single-ended input configuration. However, input coupling capacitors are needed in this configuration. Figure 61 shows a typical single-ended input application. Figure 61.
Application information TS4962 We have the following equations. + 300 300 Out – Out = V e1 × ------------- + …+ V ek × ------------R ink R in1 (V) k C eq = C in i Σ j=1 C in i 1 = ------------------------------------------------------- (F) 2× π× R × F ini CL i 1 R eq = -----------------k 1 ∑ --------Rini j =1 In general, for mixed situations (single-ended and differential inputs) it is best to use the same rule, that is, equalize impedance on both TS4962 inputs. 4.
TS4962 Application information In the case where the distance between the TS4962 output and the speaker terminals is high, it is possible to observe low frequency EMI issues due to the fact that the typical operating frequency is 250 kHz. In this configuration, we recommend using an output filter (as represented in Figure 1 on page 6). It should be placed as close as possible to the device. 4.11 Several examples with summed inputs 4.11.1 Example 1: dual differential inputs Figure 64.
Application information 4.11.2 TS4962 Example 2: one differential input plus one single-ended input Figure 65.
TS4962 Demonstration board A demonstration board for the TS4962 is available. For more information about this demonstration board, refer to the application note AN2406 "TS4962IQ class D audio amplifier evaluation board user guidelines" available on www.st.com. Figure 66.
Demonstration board TS4962 Figure 68. Bottom layer Figure 69.
TS4962 6 Recommended footprint Recommended footprint Figure 70. Recommended footprint for TS4962 DFN package 1.8mm 0.8mm 0.35mm 2.2mm 0.65mm 1.
Package information 7 TS4962 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.
TS4962 Package information Figure 71. DFN8 3 x 3 exposed pad package mechanical drawing (pitch 0.65 mm) Table 12. DFN8 3 x 3 exposed pad package mechanical data (pitch 0.65 mm) Dimensions Ref. A Millimeters Min. Typ. Max. Min. Typ. Max. 0.50 0.60 0.65 0.020 0.024 0.026 0.02 0.05 0.0008 0.002 A1 A3 0.22 0.009 b 0.25 0.30 0.35 0.010 0.012 0.014 D 2.85 3.00 3.15 0.112 0.118 0.124 D2 1.60 1.70 1.80 0.063 0.067 0.071 E 2.85 3.00 3.15 0.112 0.118 0.124 E2 1.
Ordering information 8 TS4962 Ordering information Table 13.
TS4962 9 Revision history Revision history Table 14. Document revision history Date Revision Changes 31-May-2006 5 Modified package information. Now includes only standard DFN8 package. 16-Oct-2006 6 Added curves in Section 3: Electrical characteristics. Added evaluation board information in Section 5: Demonstration board. Added recommended footprint. 10-Jan-2007 7 Added paragraph about rated voltage of capacitor in Section 4.5: Decoupling of the circuit.
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