PAM8902A

Document number: DSxxxxx Rev. 1 - 3

8 of 12

www.diodes.com

February 2013

© Diodes Incorporated

PAM8902A

A Product Line of

Diodes Incorporated

equation:

C

R

2

1

f

I

I

C

Π

=

specification calls for a flat bass response are down to 150Hz.

Equation is reconfigured as followed:

R

2

1

C

IFC

I

Π

=

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

capacitor polarity in the application.

Decoupling Capacitor

The PAM8902 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.

The optimum decoupling is achieved by using two different types of capacitors that target on 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

1µF is placed as close as possible to the device AVDD pin for the best operation. For filtering lower frequency noise signals, a large ceramic

capacitor of 10µF or greater placed near the AVDD supply trace is recommended.

External Schottky Diode

Use external schottky diode can get the best driving capability and efficiency.

Since internal power diode has limited driving capability, only in following conditions customer can remove the external schottky diode to reduce

the cost.

2. The signal frequency less than 4KHz.

3. Haptic application (50–500Hz).

Shutdown Operation

In order to reduce power consumption while not in use, the PAM8902A contains shutdown circuitry amplifier off when a logic low is placed on the

ENA pin. By switching the ENA pin connected to GND, the PAM8902A supply current draw will be minimized in idle mode.

Under-Voltage Lock-Out (UVLO)

The PAM8902A incorporates circuitry designed to detect supply voltage. When the supply voltage drops to 2.2V or below, the PAM8902A goes

into a state of shutdown, and the device comes out of its shutdown state and restore to normal function only when reset the power supply or

ENA pin.

Over-Temperature Protection (OTP)

Thermal protection on the PAM8902A prevents the device from damage when the internal die temperature exceeds +150°C. There is a 15°C

tolerance on this trip point from device to device. Once the die temperature exceeds the set point, the device will enter the shutdown state and

the outputs are disabled, in this condition both OUTP and OUTN will become high impedance. This is not a latched fault. The thermal fault is

cleared once the temperature of the die decreased by 30°C. This large hysteresis will prevent motor boating sound well and the device begins

normal operation at this point with no external system interaction.