PAM8615 Datasheet, PDF (9/13 Pages) Power Analog Micoelectronics – 16W/32W Stereo Class-D Audio Power Amplifier

PAM8615
16W/32W Stereo Class-D Audio Power Amplifier
Test Setup for Performance Testing
AP System One
Generator
PAM8615 Demo Board
Input
+OUT
Load
GND
-OUT
VDD
AP
Low Pass
Filter
AUX-0025
AP System Two
Analyzer
Power Supply
Notes
1. The AP AUX-0025 low pass filter is necessary for class-D amplifier measurement with AP analyzer.
2. Two 22µH inductors are used in series with load resistor to emulate the small speaker for effic iency
measurement.
Application Information
Power and Heat Dissipation
Choose speakers that are able to stand large
output power from the PAM8615. Otherwise,
speaker may suffer damage.
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.
Generally, class-D amplifiers are high efficiency
and need no heat sink. For high power ones that
has high dissipation power, the heat sink may also
not necessary if the PCB is carefully designed to
achieve good heat dissipation by the PCB itself.
Dual-Side PCB
To achieve good heat dissipation, the PCB's
copper plate should be thicker than 35um and the
copper plate on both sides of the PCB should be
utilized for heat sink.
The thermal pad on the bottom of the device
should be soldered to the plate of the PCB, and
via holes, usually 9 to 16, should be drilled in the
PCB area under the device and deposited copper
on the vias should be thick enough so that the
heat can be dissipated to the other side of the
plate. There should be no insulation mask on the
other side of the copper plate. It is better to drill
more vias on the PCB around the device if
possible.
Volume Control
A DC volume control section is integrated in
PAM8615, controlling via DCV and DGND
terminals. The voltage on DCV pin, determines
internal amplifier gain as listed in Page6.
If a resistor divider is used to fix gain of the
amplifier, the DCV terminal can be directly
connected to the resistor divider connected
across AVDD and DGND. For fixed gain, the
resistor divider values are calculated to center
the voltage given in Page6.
MUTE Operation
The MUTE pin is an input for controlling the
output state of the PAM8615. A logic high on this
pin disables the outputs and low enables the
outputs. This pin may be used as a quick disable
or enable of the outputs without a volume fade.
Power Analog Microelectronics, Inc
www.poweranalog.com
9
02/2012 Rev1.1