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Audio Line Driver - TPF632 - 3Peak

Número de pieza TPF632
Descripción Audio Line Driver
Fabricantes 3Peak 
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TPF632 datasheet
TPF632 pdf, arduino
Applications Information
Typical Application Circuit
TPF632
2-VRMS Audio Line Driver with Integrated Charge Pump
-VINR
VOUTR
CIN RIN RFB
GND UVP
EN
PVSS
1µF Charge Pump
CN
RFB
RIN
CIN
UVP
PGND
PVDD
CP
1µF
-VINL
VOUTL
1µF
Figure 2 Typical Application Circuit of TPF632
Typical application circuits are shown as above. TPF632 operates from a single supply voltage PVDD. It integrated
charge pump generates a negative supply PVDD at the PVSS pin. The Line driving amplifiers work with dual supplies:
PVDD and PVDD. Therefore, the DC level of the audio output can be designed to be 0V. A DC-blocking capacitor
typically seen in a single-supplied driver is not necessary.
The supply range of the TPF632 is 3.0V to 3.63V. For a 2VRMS output, the recommended supply voltage is 3.3V.RIN of
2.5kand RFB of 5kset the inverting gain of 2. Because of the exceptional noise performance of TPF632, the
dominant noise source is actually from RIN. To get better noise performance, lower input resistance and feedback
resistance may be used.
Integrated Charge Pump
The integrated charge pump in TPF632 generates negative power supply from a single supply PVDD. A flying
capacitor for the charge pump shall be applied between CP and CN. At the same time a decoupling capacitor shall be
applied between PVSS and ground. Typical value for the flying capacitor is 1uF. Typical value of the decoupling
capacitor shall be same as or larger than that of the flying capacitor. Low-ESR capacitors are recommended for the
flying capacitor and the decoupling capacitor.
Audio Signal Amplification Gain Setting
The main application of the TPF632 is to amplify/buffer audio signals and drive audio lines with very low distortion.
Typical application circuits with inverting gain are shown in Figure 3.
Non-inverting amplification of audio signals is also possible with same low distortion.
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