Electronic Components Datasheet Search |
|
PAM8615 Datasheet(PDF) 10 Page - Power Analog Micoelectronics |
|
PAM8615 Datasheet(HTML) 10 Page - Power Analog Micoelectronics |
10 / 13 page 10 , Power Analog Microelectronics Inc www.poweranalog.com Shutdown Operation Internal Bias Generator Capacitor Selection Power Supply Decoupling, CS Selection of ROSC BST_A and BST_B Capacitors VCLAMP Capacitors Internal Regulated 5-V Supply (AVDD) The PAM8615 employs a shutdown operation mode to reduce supply current to the absolute minimum level during periods of non-use to save power. The SD input terminal should be pull high during normal operation when the amplifier is in use. Pulling SD low causes the outputs to mute and the amplifier to enter a low-current state. SD should never be left unconnected to prevent the amplifier from unpredictable operation. For the best power-off pop performance, the amplifier should be set in shutdown mode prior to removing the power supply voltage. The internal bias generator (VCM) provides the internal bias for the preamplifier stage. The e xt e r n a l in p u t ca p a cit o r s a n d t h is in t e r n a l reference allow the inputs to be biased within the o p t i m a l c o m m o n - m o d e r a n g e o f t h e i n p u t preamplifiers. The selection of the capacitor value on the VCM terminal is critical for achieving the best device performance. During startup or recovery from shutdown state, the VCM capacitor determines the rate at which the am plifier starts up. The startup time is not critical for the best de-pop performance since any heard pop sound is the result of the class-D output switching-on other than that of the startup time. However, at least a 0.47µF capacitor is recommended for the VCM capacitor. Another function of the VCM capacitor is to bypass high frequency noise on the internal bias generator. The PAM8615 is a high-performance CMOS audio amplifier that requires adequate power supply decoupling to ensure the output total harmonic distortion (THD) as low as possible. Power supply decoupling also prevents oscillations caused by long lead between the amplifier and the speaker. The optimum decoupling is achieved by using two capacitors of different types that target different types of noise on the power supply leads. For higher frequency transients, spikes, or digital hash on the line, a good low equivalent-series- resistance (ESR) ceramic capacitor, typically 0.1µF, is recommended, placing as close as possible to the device's PVCC lead. To filter l o w e r - f r e q u e n c y n o i s e s , a l a r g e a l u m i n u m electrolytic capacitor of 470µF or greater is recommended, placing near the audio power amplifier. The 10µF capacitor also serves as a local storage capacitor for supplying current during large signal transients on the amplifier outputs. The switching frequency is determined by the values of components connected to ROSC (pin 19) and calculated with the following equation: The recommended values is 323 kHz. The half H-bridge output stages use NMOS transistors only. They therefore require bootstrap capacitors for the high side of each output to turn on correctly. An at least 220nF ceramic capacitor, rated for at least 25V, must be connected from each output to its corresponding bootstrap input. Sp ecif ica lly, on e 22 0 nF cap a cito r m us t b e connected from OUT_A to BST_A, and another 220nF capacitor from OUT_B to BST_B. It is recommended to replace 220nF for lower than 100Hz applications. To ensure that the maximum gate-to-source voltage for the NMOS output transistors not exceeded, two internal regulators are used to clamp the gate voltage. A 1µF capacitors must be connected from VCLAMP to ground and must be rated for at least 25V. The voltages at the VCLAMP terminals vary with VCC and may not be used to power any other circuitry. The AVDD terminal is the output of an internally- generated 5V supply, used for the oscillator, preamplifier, and volume control circuitry. It requires a 0.1µF to 1µF capacitor, placed very close to the pin to Ground to keep the regulator stable. The regulator may not be used to power any external circuitry. ROSC=100k Ω for a switching frequency of use 1 μF BST capacitor to PAM8615 16W/32W Stereo Class-D Audio Power Amplifier 02/2012 Rev1.1 pF R f OSC osc 21 68 . 0 = |
Similar Part No. - PAM8615 |
|
Similar Description - PAM8615 |
|
|
Link URL |
Privacy Policy |
ALLDATASHEET.NET |
Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | 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 |