|
If you can't view the Datasheet, Please click here to try to view without PDF Reader . |
|
Datasheet File OCR Text: |
www.fairchildsemi.com FAN7031 2W Stereo Power Amplifier with Four Selectable Gain Setting and Headphone Drive Features * 1.85WRMS and 2.45WRMS Power Per Each Channel Into 4 Load With Less Than 1% and 10% THD+N, Respectively * Selectable Gain Via Internal Gain Control Circuit Which Eliminates External Gain Setting Resistors : 6dB, 10.3dB, 15.6dB, 21.6dB(Select) * Low Quiescent Current : Typical 5.5mA@5V * Low Shutdown Current : Typical 0.04A@5V * Fully Differential Input, Which Immunes the Common Mode Noise * Stereo Headphone Drive * Active Low Shutdown Logic * Guaranteed Stability Under No Load Condition * Thermally Enhanced Surface-Mount 20TSSOP-EP Package Description The FAN7031 is a dual fully differential power amplifier in a 20-pin TSSOP-EP thermally enhanced package. When delivering 1.85W of continuous RMS power into 4 speaker at 5V supply, the FAN7031 has less than 1% of THD+N over the entire audible frequency range, 20Hz to 20kHz. To save power consumption in the portable applications, the FAN7031 provides shutdown function. Setting the shutdown pin to ground level, the FAN7031 falls into shutdown mode and consumes less than 4A over all supply voltage range, 2.7V to 5.5V. Two gain setting pins(G0 and G1) control the gain of the FAN7031. The gain is selectable to 6dB, 10dB, 15.6dB and 21.6dB. The FAN7031 provides the singleended(SE) operation by setting SE/BTL pin to above VDD/2. Using SE/BTL pin and a mechanical switch which provides at the headphone jack, SE mode and BTL mode are automatically determined. Additional components such as resistors for gain setting and bootstrap capacitors are not needed, making the FAN7031 well suited for portable sound systems and other hand-held sound equipment. Target applications include notebook and desktop computers and portable audio equipment. 20-TSSOP-EP 1 Rev. 1.0.1 (c)2003 Fairchild Semiconductor Corporation FAN7031 Internal Block Diagram RINROUT+ RIN+ ROUT- CONTROL G0 G1 SE/BTL SD Gain Control SE/BTL Control On/Off Control BIAS TSD VDD/2 Current Source BYPASS LINLOUT+ LIN+ LOUT- 2 FAN7031 Pin Assignments GND G0 G1 LOUT+ LINPVDD2 RIN+ LOUTLIN+ BYPASS 1 20 GND SD ROUT+ RINVDD PVDD1 ROUTNC SE/BTL Heat Sink 10 11 GND Pin Description Pin No 1* 2 3 4 5 6** 7 8 9 10 11* 12 13 14 15** 16** 17 18 19 20* Symbol GND G0 G1 LOUT+ LINPVDD2 RIN+ LOUTLIN+ BYPASS GND SE/BTL NC ROUTPVDD1 VDD RINROUT+ SD GND I/O I I O I I I O I O I O I I I O I Ground Gain Selection Input(MSB) Gain Selection Input(LSB) Left Channel (+) Output Left Channel (-) Input Left Channel Power Supply Voltage Right Channel (+) Input Left Channel (-) Output Left Channel (+) Input Bypass Capacitor Connect Ground Single-Ended & BTL Selection: GND SE/BTL VDD/2:BTL Mode VDD/2 < SE/BTL VDD: SE Mode No Connection Right Channel (-) Output Right Channel Power Supply Voltage Power Supply Voltage Right Channel (-) Input Right Channel (+) Output Shutdown Logic Low SD=VDD: Chip Enable SD=GND: Chip Shutdown Ground Decription * All GND is internally tied together. ** For the best performance, VDD, PVDD1 and PVDD2 must be the same voltage level(strongly recommend). 3 FAN7031 Absolute Maximum Ratings Parameter Maximum Supply Voltage Power Dissipation Operating Temperature Storage Temperature Junction Temperature Thermal Resistance (Junction to Ambient) ESD Rating (Human Body Model) Symbol VDDmax PD TOPG TSTG TJ Rthja Value 6.0V Internally Limited -40 ~ +85 -65 ~ +150 150 30.4 112.5 2000 Unit V W C C C C/W V Multi Layer Board Single Layer Board See Derating Curve Remark Note1 : Rthja was derived using a JEDEC multi layer and single layer. Operating Ratings Parameter Power Supply Voltage Symbol VDD Min 2.7 Typ Max 5.5 Unit V 4 FAN7031 Electrical Characteristics (VDD = 5.0V, Ta = 25C, unless otherwise specified) Parameter Offset Voltage Supply Current Shutdown Current Output Power Symbol VOFF IDD ISD PO Conditions RL=4, Av=6dB No Input, No Load SD = GND THD+N =1%, RL = 4, f = 1kHz THD+N =10%, RL = 4, f = 1kHz SE/BTL=GND, G0=GND, G1=GND, Vin=4Vpp, No Load BTL Mode Gain Av SE/BTL=GND, G0=GND, G1=VDD, Vin=2.44Vpp, No Load SE/BTL=GND, G0=VDD, G1=GND, Vin=1.34Vpp, No Load SE/BTL=GND, G0=VDD, G1=VDD, Vin=0.66Vpp, No Load SE Mode Gain Total Harmonic Distortion + Noise Power Supply Rejection Ratio THD+N PSRR SE/BTL=VDD, Vin=2.44Vpp, No Load PO = 1W, RL=4, f = 20kHz Cbyp = 0.47F, RL=4, BTL Mode, VDD=500mVpp, f = 1kHz Min. -25 40 Typ. 5.5 0.04 1.85 2.45 6 10.3 15.6 21.3 4.3 0.2 70 Max. 25 10 4 0.75 Unit mV mA A W W dB dB dB dB dB % dB Electrical Characteristics (Continued) (VDD = 3.3 V, Ta = 25C, unless otherwise specified) Parameter Offset Voltage Supply Current Shutdown Current Output Power Total Harmonic Distortion + Noise Power Supply Rejection Ratio Symbol VOFF IDD ISD PO THD+N PSRR Conditions RL=4, Av=6dB No Input, No Load SD = GND THD+N =10%, RL = 4, f=1kHz PO = 0.5W, RL = 4, f = 20kHz Cbyp = 0.47F, RL=4, BTL Mode, VDD=330mVpp, f = 1kHz Min. -25 40 Typ. 4.3 0.08 1.02 0.2 70 Max. 25 8 4 0.75 Unit mV mA A W % dB Electrical Characteristics (Continued) (VDD = 2.7 V, Ta = 25C, unless otherwise specified) Parameter Offset Voltage Supply Current Shutdown Current Output Power Total Harmonic Distortion + Noise Power Supply Rejection Ratio Symbol VOFF IDD ISD PO THD+N PSRR Conditions RL=4, Av=6dB No Input, No Load SD = GND THD+N =10%, RL = 4, f=1kHz PO = 0.25W, RL = 4, f = 20kHz Cbyp = 0.47F, RL=4, BTL Mode, VDD=270mVpp, f = 1kHz Min. -25 Typ. 4.1 0.04 0.54 0.2 65 Max. 25 7 4 0.75 Unit mV mA A W % dB 5 FAN7031 Performance Characteristics 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 10m 10 5 2 1 BTL mode VDD=5V RL=8ohm Av=6dB 20kHz 20kHz THD [%] 0.5 0.2 0.1 0.05 THD [%] 1kHz 1kHz 20Hz BTL mode VDD=5V RL=4ohm Av=6dB 20m 50m 100m 200m Output Power [W] 500m 1 2 3 0.02 0.01 0.005 0.002 0.001 10m 20m 20Hz 50m 100m 200m 500m 1 2 3 Output Power [W] Figure 1. THD+N vs. Output Power Figure 2. THD+N vs. Output Power 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 10m 20m 50m 100m 200m 500m 10 5 2 1 BTL mode VDD=3.3V RL=8ohm Av=6dB 20kHz 1kHz 20kHz 1kHz THD [%] 0.5 0.2 0.1 0.05 0.02 THD [%] 20Hz BTL mode VDD=3.3V RL=4ohm Av=6dB 1 2 0.01 0.005 0.002 0.001 10m 20m 50m 20Hz 100m Output Power [W] 200m 500m 1 Output Power [W] Figure 3. THD+N vs. Output Power Figure 4. THD+N vs. Output Power 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 10m 20m 50m 100m Output Power [W] 200m 10 5 2 1 BTL mode VDD=2.7V RL=8ohm Av=6dB 20kHz 1kHz 20kHz THD [%] 0.5 0.2 0.1 0.05 0.02 THD[%] 1kHz 20Hz BTL mode VDD=2.7V RL=4ohm Av=6dB 500m 1 0.01 0.005 0.002 0.001 10m 20m 50m 20Hz 100m Output Power [W] 200m 500m 1 Figure 5. THD+N vs. Output Power Figure 6. THD+N vs. Output Power 6 FAN7031 Performance Characteristics(Continued) 10 5 10 2 1 THD [%] Single-ended mode VDD=5V RL=32ohm Av=4.3dB 5 20kHz 21.6dB 15.6dB 10.3dB BTL mode VDD=5V RL=4ohm 6dB 2 1 THD [%] 0.5 0.5 0.2 0.1 0.05 20kHz 1kHz 0.2 0.1 0.05 1kHz 6dB 10.3dB 15.6dB 200m Output Power [W] 0.02 0.01 100u 20Hz 200u 500u 1m 2m 5m 10m 20m 50m 100m 200m 0.02 0.01 10m 21.6dB 500m 1 2 3 20m 50m 100m Output Power [W] Figure 7. THD+N vs. Output Power Figure 8. THD+N vs. Gain 10 5 10 20kHz 21.6dB 15.6dB 10.3dB 6dB 5 20kHz 21.6dB 15.6dB 10.3dB 6dB 2 1 2 1 THD [%] 0.5 THD [%] 0.5 0.2 0.1 0.05 0.2 0.1 1kHz 6dB 10.3dB 15.6dB 200m 0.05 0.02 0.01 10m 21.6dB 500m BTL mode VDD=3.3V RL=4ohm 1 2 1kHz 6dB 10.3dB 15.6dB 100m Output Power [W] 0.02 0.01 10m 21.6dB 200m BTL mode VDD=2.7V RL=4ohm 500m 1 20m 50m 100m 20m 50m Output Power [W] Figure 9. THD+N vs. Gain Figure 10. THD+N vs. Gain 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k 10 VDD=5V Output power =1W RL=4ohm 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 VDD=3.3V Output power = 500mW RL=4ohm THD [%] THD [%] 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 11. THD+N vs. Frequency Figure 12. THD+N vs. Frequency 7 FAN7031 Performance Characteristics(Continued) 10 5 2 1 0.5 0.2 0.1 0.05 0.02 0.01 0.005 0.002 0.001 20 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k 0.02 0.01 20 10 VDD=2.7V Output power = 250mW RL=4ohm 5 2 1 THD [%] 0.5 Single-ended mode VDD=5V Output power = 50mW RL=32ohm THD [%] 0.2 0.1 0.05 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 13. THD+N vs. Frequency Figure 14. THD+N vs. Frequency +0 -10 -20 -30 -40 Crosstalk [dB] Crosstalk [dB] -50 -60 -70 -80 -90 -100 -110 -120 20 +0 VDD=5V Output power = 1W RL=4ohm -10 -20 -30 -40 -50 -60 -70 -80 -90 VDD=5V Output power = 1W RL=8ohm Left-to-Right Right-to-Left Right-to-Left Left-to-Right 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k -100 -110 -120 20 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 15. Crosstalk vs. Frequency Figure 16. Crosstalk vs. Frequency +0 -10 -20 -30 -40 Crosstalk [dB] -50 -60 -70 -80 -90 -100 -110 -120 20 PSRR [dB] +0 Single-ended mode VDD=5V Output power = 50mW RL=32ohm -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 VDD=5V+/-5% RL=4ohm Right-to-Left Left-to-Right 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k -110 -120 20 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 17. Crosstalk vs. Frequency Figure 18. PSRR vs. Frequency 8 FAN7031 Performance Characteristics(Continued) +0 -10 -20 -30 -40 PSRR [dB] -50 -60 -70 -80 -90 -100 -110 -120 20 PSRR [dB] +0 VDD=3.3V+/-5% RL=4ohm -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -110 -120 20 VDD=2.7V+/-5% RL=4ohm 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 19. PSRR vs. Frequency Figure 20. PSRR vs. Frequency +0 -10 -20 -30 -40 PSRR [dB] -50 -60 -70 -80 -90 -100 20 PSRR [dB] +0 -10 -20 -30 -40 -50 -60 -70 Single-ended mode VDD=5V+/-5% RL=32ohm Cbyp=0.47uF 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k -80 -90 -100 20 Single-ended mode VDD=3.3V+/-5% RL=32ohm Cbyp=0.47uF 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 21. PSRR vs. Frequency Figure 22. PSRR vs. Frequency +0 -10 -20 -30 -40 PSRR [dB] -50 -60 -70 -80 -90 -100 20 +0 -10 -20 -30 -40 -50 -60 -70 0.1F 0.47F 1F PSRR [dB] 4.7F 10F Single-ended mode VDD=2.7V+/-5% RL=32ohm Cbyp=0.47uF 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k -80 -90 -100 20 Single-ended mode VDD=5V+/-5% RL=32ohm 50 100 200 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 23. PSRR vs. Frequency Figure 24. PSRR vs. Bybass Capacitor 9 FAN7031 Performance Characteristics(Continued) +20 G0=VDD, G1=VDD +20 G0=VDD, G1=VDD +15 +15 G0=VDD, G1=GND Gain [dB] +10 Gain [dB] +10 G0=VDD, G1=GND G0=GND, G1=VDD +5 G0=GND, G1=VDD +5 +0 20 VDD=5V No load Cin=0.47uF 50 100 200 G0=GND, G1=GND +0 500 1k Frequency [Hz] 2k 5k 10k 20k 20 VDD=3.3V No load Cin=0.47uF 50 100 200 G0=GND, G1=GND 500 1k Frequency [Hz] 2k 5k 10k 20k Figure 25. BTL Mode Gain vs. Frequency Figure 26. BTL Mode Gain vs. Frequency 6.0m +20 G0=VDD, G1=VDD 5.0m +15 4.0m G0=VDD, G1=GND IDD Current [A] 5k 10k 20k Gain [dB] +10 3.0m G0=GND, G1=VDD +5 2.0m +0 20 VDD=2.7V No load Cin=0.47uF 50 100 200 G0=GND, G1=GND 1.0m 0.0 500 1k Frequency [Hz] 2k 0 1 2 3 4 5 Supply Voltage [V] Figure 27. BTL Mode Gain vs. Frequency Figure 28. IDD vs. Supply Voltage 25.0n 8.0m 20.0n 6.0m VDD=5V VDD=3.3V VDD=2.7V Shutdown Current [A] 15.0n Current [A] 4.0m 10.0n 5.0n 2.0m 0.0 0.0 -1 0 1 2 3 4 5 6 7 8 0 1 2 3 4 5 Supply Voltage [V] Shutdown Pin Voltage [V] Figure 29. Shutdown Current vs. Supply Voltage Figure 30. IDD vs. Shutdown Pin Voltage 10 FAN7031 Performance Characteristics(Continued) 5.5m 4.5m 5.0m BTL mode IDD Current [A] 4.5m IDD Current [A] 4.0m BTL mode 3.5m 4.0m Single-Ended mode Single-Ended mode 3.0m 3.5m VDD=5V 3.0m 0 1 2 3 4 5 SE/BTL Pin Voltage [V] 2.5m -0.5 VDD=3.3V 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 SE/BTL Pin Voltage [V] Figure 31. IDD vs. SE/BTL Pin Voltage Figure 32. IDD vs. SE/BTL Pin Voltage 4.5m 0.7 0.6 4.0m BTL mode Power Dissipation [W] 0.5 VDD=5V IDD Current [A] 3.5m 0.4 0.3 3.0m Single-Ended mode VDD=3.3V 0.2 VDD=2.7V 2.5m VDD=2.7V 0.1 THD less than 1% RL=8ohm f=1kHz 1.0 1.5 0.0 0.0 0.5 1.0 1.5 SE/BTL Pin Voltage [V] 2.0 2.5 3.0 0.0 0.5 Output Power [W] Figure 33. IDD vs. SE/BTL Pin Voltage Figure 34. Power Dissipation vs. Output Power 3.0 1.4 1.2 VDD=5V 2.5 BTL mode f=1kHz RL=4ohm Power Dissipation [W] 1.0 Output Power [W] 2.0 0.8 10% THD+N 1.5 0.6 VDD=3.3V VDD=2.7V 1% THD+N 1.0 0.4 0.2 THD less than 1% RL=4ohm f=1kHz 1.0 Output Power [W] 1.5 2.0 0.5 0.0 0.0 0.5 0.0 2.5 3.0 3.5 4.0 Supply Voltage [V] 4.5 5.0 5.5 Figure 35. Power Dissipation vs. Output Power Figure 36. Output Power vs. Supply Voltage 11 FAN7031 Performance Characteristics(Continued) 2.0 2.5 1.5 BTL mode f=1kHz RL=8ohm 10% THD+N 2.0 BTL mode VDD=5V f=1kHz Output Power [W] 1.0 Output Power [W] 1.5 10% THD+N 1.0 1% THD+N 0.5 1% THD+N 0.5 0.0 2.5 3.0 3.5 4.0 Supply Voltage [V] 4.5 5.0 5.5 0.0 0 8 16 24 32 40 48 56 64 RL-Load Resistance [] Figure 37. Output Power vs. Supply Voltage Figure 38. Output Power vs. Load Resistance 1.2 0.7 1.0 BTL mode VDD=3.3V f=1kHz 0.6 BTL mode VDD=2.7V f=1kHz 0.5 0.8 Output Power [W] 0.6 Output Power [W] 0.4 0.3 10% THD+N 0.4 10% THD+N 1% THD+N 0.2 0.2 1% THD+N 0.1 0.0 0 8 16 24 32 40 48 56 64 RL-Load Resistance [] 0.0 0 8 16 24 32 40 48 56 64 RL-Load Resistance [] Figure 39. Output Power vs. Load Resistance Figure 40. Output Power vs. Load Resistance 800.0m 0.30 700.0m Single-Ended mode VDD=5V f=1kHz 0.25 Single-Ended mode VDD=3.3V f=1kHz 600.0m 0.20 500.0m Output Power [W] Output Power [W] 400.0m 10% THD+N 0.15 10% THD+N 300.0m 0.10 200.0m 1% THD+N 100.0m 1% THD+N 0.05 0.0 0 8 16 24 32 40 48 56 64 RL-Load Resistance [] 0.00 0 8 16 24 32 40 48 56 64 RL-Load Resistance [] Figure 41. Output Power vs. Load Resistance Figure 42. Output Power vs. Load Resistance 12 FAN7031 Performance Characteristics(Continued) 0.20 4.5 Single-Ended mode VDD=2.7V f=1kHz 0.15 4.0 3.5 Power Dissipation [W] 3.0 2.5 2.0 1.5 1.0 0.5 0.0 M u lti L a ye r Output Power [W] 0.10 10% THD+N S in g le L a ye r 0.05 1% THD+N 0.00 0 8 16 24 32 40 48 56 64 RL-Load Resistance [] 0 25 50 75 100 125 150 A m bient Tem perature [C] Figure 43. Output Power vs. Load Resistance Figure 44. Power Derating Curve 13 FAN7031 Typical Application Circuits Single-Ended Inputs VDD 10F VDD 6,15,16 Right channel Single ended Input 0.47F RIN- 17 RIN+ 7 0.47F Right Output (BTL) 14 ROUTVDD VDD SD G0 G1 10k 10k 0.47F Left channel Single ended Input 0.47F LIN+ 9 LIN- 5 10k 19 2 3 GAIN SELECT 104 18 ROUT+ 330F 1k 100k BIAS & CONTROL 10 BYPASS 1F 100k 12 4 SE/BTL LOUT+ 330F Left Output (BTL) 8 LOUT1k Stereo Output VREF 1,11,20 GND 14 FAN7031 Typical Application Circuits(Continued) Differential Inputs VDD 10F VDD 6,15,16 Right channel Differential Input 0.47F RIN- 17 RIN+ 7 0.47F Right Output (BTL) 14 ROUTVDD VDD SD G0 G1 10k 10k 10k LIN+ 9 LIN- 5 0.47F 19 2 3 GAIN SELECT 104 18 ROUT+ 330F 1k BIAS & CONTROL 100k 10 BYPASS 1F 100k SE/BTL LOUT+ 330F Left Output (BTL) 8 LOUT1k Stereo Output VREF 12 4 0.47F Left channel Differential Input 1,11,20 GND 15 FAN7031 Functional Description The FAN7031 is a stereo 2W amplifier capable of delivering 1.85W continuous RMS power into a 4-ohm load. This device has less than 0.75% THD+N across the entire frequency range at an output power of 1W. A thermally enhanced TSSOP package is used to allow for maximum dissipation of package heat. Gain selection is achieved by driving G0 and G1 inputs according to the table below. G0 G1 SE/BTL AV Zin 0 0 1 1 X 0 1 0 1 X 0 0 0 0 1 6dB 10.3dB 15.6dB 21.6dB 4.3dB 90k 55k 30k 15k 55k Gain select pins are activated only when SE/BTL pin is set to low level. If SE/BTL pin is high, the amplifier configuration is changed as SE(single-ended) mode and the gain of SE amplifier is fixed to 4.3dB (about 1.64). Gain is varied by changing the taps on input resistors, and such change in gain will cause variation in the input impedance. Input impedance (Zin) is described in the above table. The impedance variation determines amplifier lowest bandwidth. Thus, input DC decoupling capacitors must be carefully selected. Applications Information PCB Layout and Supply Regulation Metal trace resistance between the BTL output and the parasitic resistance of the power supply line both heavily affect the output power. In order to obtain the maximum power depicted in the performance characteristics figures, outputs, power and ground lines need wide metal trace. The parasitic resistance of the power line increases ripple noise and degrades the THD and PSRR performance. To reduce such unwanted effect, large capacitor must be connected between VDD pin and GND pin as close as possible. To improve power supply regulation performance, use a low ESR capacitor. Power Supply Bypassing Selection of proper power supply bypassing capacitor is critical to obtaining lower noise as well as higher power supply rejection. Larger capacitors may help to increase immunity to the supply noise. However, considering economical design, attaching 10F electrolytic capacitor or tantalum capacitor with 0.1F ceramic capacitor as close as possible to the VDD pins are enough to get a good supply noise rejection. Selection of Input Capacitor Input capacitor blocks DC signal also low frequency input signal. Thus, this capacitor acts as a high pass filter. The -3dB frequency of this filter is determined by input capacitor and input impedance of the amplifier. The frequency is 1 f - 3dB = ---------------------------2 Zin C As shown previously, the input impedance is changed by selecting gain. Considering smallest Zin (=15kW), the capacitance which meets f-3dB frequency of 20Hz is 0.53uF. Thus, selecting the capacitance higher than 0.53uF, the lowest frequency of audio signal can be amplified without gain loss. 16 FAN7031 BLT Mode of Operation vs. Single Ended Mode of Operation The FAN7031 offers both BTL (Bridge-Tied Load) and SE (Single Ended) operation. When SE/BTL pin is low, BTL operation is selected. In BTL operation, maximum output power is increased 4 times comparing with SE operation at the same load, output swing and supply condition because output swing is doubled. Thus, BTL mode is useful to drive a speaker load. On the other hand, when SE/BTL pin is high, one amplifier configured BTL driver is turned off and only single amplifier is activated. In this mode, maximum output power is reduced and the quiescent power consumption is saved about half. Thus, SE mode is adequate for head-phone load. The output power of BTL and SE are expressed as follows respectively: 2 Vp P BTL = --------------- , 2 RL 2 Vp P SE = --------------- . 8 RL To use the amplifier in SE mode, the output DC voltage must be blocked not to increase power consumption. Thus, the load is tied to output via output DC blocking capacitor. The capacitor size can be chosen using above f-3dB equation. For example, assuming the load impedance is 32W, 249uF capacitor guarantees 20Hz signal transmission to the load without gain reduction. Shutdown Mode The device moves to a shutdown mode when the shutdown pin is at 0V. For normal operation the shutdown pin should be at VDD. This pin should never be left unconnected. 17 FAN7031 Mechanical Dimensions Package Dimensions in millimeters 20TSSOP-EP 18 FAN7031 Ordering Information Device FAN7031MTF Package 20TSSOP-EP Operating Temperature -40C ~ +85C 19 FAN7031 DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. www.fairchildsemi.com 8/11/03 0.0m 001 Stock#DSxxxxxxxx 2003 Fairchild Semiconductor Corporation 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. |
|
|
All Rights Reserved © IC-ON-LINE 2003 - 2022 |
[Add Bookmark] [Contact Us] [Link exchange] [Privacy policy] |
Mirror Sites : [www.datasheet.hk]
[www.maxim4u.com] [www.ic-on-line.cn]
[www.ic-on-line.com] [www.ic-on-line.net]
[www.alldatasheet.com.cn]
[www.gdcy.com]
[www.gdcy.net] |