PAM8610

Document number: DSxxxxx Rev. 1 - 2

12 of 15

www.diodes.com

June 2013

© Diodes Incorporated

PAM8610

A Product Line of

Diodes Incorporated

Selection of COSC and ROSC

BSN and BSP Capacitors

The full H-bridge output stages use NMOS transistors only. They therefore require bootstrap capacitors for the high side of each output to turn

on correctly. At least 220nF ceramic capacitor, rated for at least 25V, must be connected from each output to its corresponding bootstrap input.

Specifically, one 220nF capacitor must be connected from xOUTP to xBSP, and another 220nF capacitor from xOUTN to xBSN. It is

recommended to use 1µF BST capacitor to replace 220nF (pin15, pin 16, pin 35 and pin 36) for lower than 100Hz applications.

VCLAMP Capacitors

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. Two 1

μF capacitors must be connected from VCLAMPL and VCLAMPR to ground and must be rated for at least 25V. The voltages

Internal Regulated 5-V Supply (AVDD)

The AVDD terminal is the output of an internally generated 5V supply, used for the oscillator, preamplifier, and volume control circuitry. It

requires a 0.1

μF 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

The differential input stage of the amplifier eliminates noises that appear on the two input lines of the channel. To use the PAM8610 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 PAM8610 with a single-ended source, acground 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 acgrounded at the audio source other than

at the device input for best noise performance.

Using Low-ESR Capacitors

Low- ESR capacitors are recommended 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.

Short-Circuit Protection

The PAM8610 has short circuit protection circuitry on the outputs to prevent damage to the device when output-to-output shorts, output-to-GND

fault and must be reset by cycling the voltage on SD 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

Thermal protection on the PAM8610 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.