PAM8006 datasheet(12/15 Pages) PAM

12 / 15 page

Power Analog Microelectronics Inc

PAM8006

10W Stereo Class-D Audio Power Amplifier

www.poweranalog.com

Internal Regulated 5-V Supply (AVDD)

The AVDD terminal is the output of an internally-

generated 5V supply, used for the oscillator,

preamplifier. 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.

Differential Input

Using low-ESR Capacitors

Short-circuit Protection

Thermal Protection

The differential input stage of the amplifier

eliminates noises that appear on the two input

lines of the channel. To use the PAM8006 with a

differential source, connect the positive lead of

the audio source to the INP input and the negative

lead from the audio source to the INN input. To

use the PAM8006 with a single-ended source, ac-

ground the INP input through a capacitor equal in

value to the input capacitor on INN and apply the

audio source to the INN input. In a single-ended

input application, the INP input should be ac-

grounded at the audio source other than at the

device input for best noise performance.

L o w - E S R

c a p a c i t o r s

a r e

r e c o m m e n d e d

throughout this application section. A real (with

respect to ideal) capacitor can be modeled simply

as a resistor in series with an ideal capacitor. The

voltage drop across this resistor minimizes the

beneficial effects of the capacitor in the circuit.

The lower the equivalent value of this resistance

the more the real capacitor behaves as an ideal

capacitor.

The PAM8006 has short circuit protection circuitry

on the outputs to prevent damage to the device

when output-to-output shorts, output-to-GND

shorts, or output-to-VCC shorts occur. Once a

short-circuit is detected on the outputs, the output

drive is immediately disabled. This is a latched

fault and must be reset by cycling the voltage on

the

pin to a logic low and back to the logic high

state for normal operation. This will clear the

short-circuit flag and allow for normal operation if

the short was removed. If the short was not

removed, the protection circuitry will again

activate.

Thermal protection on the PAM8006 prevents

damage to the device when the internal die

temperature exceeds 150°C. There is a ±15

degree tolerance on this trip point from device to

device. Once the die temperature exceeds the set

thermal point, the device enters into the shutdown

state and the outputs are disabled. This is not a

latched fault. The thermal fault is cleared once the

temperature of the die is reduced by 40°C. The

device begins normal operation at this point

without external system intervention.

Selection of COSC and Frequency Setting

Selection of Gain and Input Signal Amplitude

The switching frequency is determined by the

values of components connected to COSC and

calculated as follows:

= 22 / (Cosc*R)

R is the internal resistor and the vaule is 400k

and with

tolerance.The frequency may

varies from 200kHz to 300kHz by adjusting the

values of C

. The recommended value is C

220pF for a switching frequency of 250kHz.

The PAM8006 has two internal amplifier stages

with fixed gain. The pre-amp stage gain is 10X,

while the second stage gain is 5X.

The pre-amp is powered internally by the 5V value

of AVDD. At maximum pre-amp gain operation for

avoiding the pre-amp saturation, it's worth noting

that the peak value of input signal (Vp) shouldn't

exceed 250mV when the THD+N of PAM8006 is

lower than 1%; and the Vp value shouldn't exceed

300mV when the THD+N is lower than 10%.

Total gain is calculated as follows:

Gain=20log[100k/(10k+R

OSC

)*5]

is external input resistor.)

03/2011 Rev1.0

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