TA2020-020 Ver la hoja de datos (PDF) - Tripath Technology Inc.

Número de pieza

componentes Descripción

Fabricante

TA2020-020

Stereo 20W (4Ω) Class-T Digital Audio Amplifier using Digital Power Processing™ Technology

Tripath Technology Inc. 

TECHNICAL INFORMATION

B

pin to be pulled up through a large valued resistor (1MΩ recommended) to VDD. To disable SLEEP

mode, the sleep pin should be grounded.

Fault Pin

The FAULT pin is a 5V logic output that indicates various fault conditions within the device. These

conditions include: low supply voltage, low charge pump voltage, low 5V regulator voltage, over

current at any output, and junction temperature greater than approximately 155°C. The FAULT

output is capable of directly driving an LED through a series 200Ω. The FAULT output is capable of

directly driving an LED through a series 200Ω resistor. If the FAULT pin is connected directly to the

MUTE input an automatic reset will occur in the event of an over-current condition.

Heat Sink Requirements

In some applications it may be necessary to fasten the TA2020-020 to a heat sink. The determining

factor is that the 150°C maximum junction temperature, TJ(max) cannot be exceeded, as specified

by the following equation:

( ) PDISS = TJ(MAX ) − TA

θ JA

where…

PDISS = maximum power dissipation

TJMAX = maximum junction temperature of TA2020-020

TA = operating ambient temperature

θJC = junction-to-case thermal resistance of TA2020-020

Example:

What size heat sink is required to operate the TA2020-020 at 20W per channel continuously in a

70ºC ambient temperature?

PDISS is determined by:

η Efficiency =

=

POUT

PIN

=

POUT

POUT − PDISS

PDISS (per channel) = POUT

η

− POUT

=

20

0.8

−

20

=

5W

Thus, PDISS for two channels = 10W

( ) θJA =

TJ(MAX ) − TA

PDISS

=

150 − 70

10

=

8°C/W

10 of 13

TA2020-020, Rev. 4.0, 09.00

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