Electronic Components Datasheet Search |
|
PAM8320RDR Datasheet(PDF) 6 Page - Diodes Incorporated |
|
PAM8320RDR Datasheet(HTML) 6 Page - Diodes Incorporated |
6 / 11 page PAM8320 Document number: DS36610 Rev. 1 - 2 6 of 11 www.diodes.com October 2013 © Diodes Incorporated PAM8320 A PRODUCT LINE OF DIODES INCORPORATED Application Information Input Capacitors (Ci) In the typical application, an input capacitor Ci, is required to allow the amplifier to bias the input signal to the proper DC level for optimum operation. In this case, Ci and the minimum input impedance Ri form is a high-pass filter with the corner frequency determined in the follow equation: C 1 f 2RiCi It is important to consider the value of Ci as it directly affects the low frequency performance of the circuit. For example, when Ri is 40kΩ and the specification calls for a flat bass response are down to 20Hz. The equation is reconfigured as followed to determine the value of Ci: ic 1 Ci 2R f When input resistance variation is considered Ci is 200nF, so one would likely choose a value of 220nF. A further consideration for this capacitor is the leakage path from the input source through the input network (Ci, Ri and Rf) to the load. This leakage current creates a DC offset voltage at the input to the amplifier that reduces useful headroom, especially in high gain applications. For this reason, a low-leakage tantalum or ceramic capacitor is the best choice. When polarized capacitors are used, the positive side of the capacitor should face the amplifier input in most applications as the DC level is held at VDD/2, which is likely higher than the source DC level. Please note that it is important to confirm the capacitor polarity in the application. Input Resistance The value of the input resistance (Ri) of the amplifier is 40kΩ ±20%. If a single capacitor is added to the input of the high-pass filter the –3dB cutoff frequency can be calculated using equation: C 1 f 2RiCi Gain Formula with External Input Resistor The default gain of PAM8320 is 26dB. The gain can be reduced by adding one external resistor between input decoupling capacitor and IN PIN. The gain formula is as below: k R A x v 400 14 1 20 Note: Rx is external input resistor Power and Heat Dissipation Speakers must be chosen to withstand the large output power from the PAM8320, otherwise speaker damage may occur. Heat dissipation is very important when the device works in full power operation. Two factors affect the heat dissipation, the efficiency of the device that determines the dissipation power and the thermal resistance of the package that determines the heat dissipation capability. The PAM8320 class-D amplifier is highly efficiency and should not need heat sink. Operating at higher powers a heat sink still may not be necessary if the PCB is carefully designed to achieve good thermal dissipation. |
Similar Part No. - PAM8320RDR |
|
Similar Description - PAM8320RDR |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.COM |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |