RB-TA3020 Ver la hoja de datos (PDF) - Tripath Technology Inc.

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RB-TA3020

CLASS-T DIGITAL AUDIO AMPLIFIER REFERENCE BOARD USING DIGITALPOWER PROCESSING (DPP™) TECHNOLOGY

Tripath Technology Inc. 

Tripath Technology, Inc. - Technical Information

Input Connections

Audio input to the board is located at CH1 INPUT (J100) and CH2 INPUT (J200) (see Figures 2 and 3).

The input can be a test signal or music source. A dual RCA cable is provided with female 100mil

connectors that mate with J100 and J200.

Output Connections

There are two output connectors on the reference board for the speaker outputs. Channel 1 output and

associated Power Ground 1 is located at J101. Channel 2 output and associated Power Ground 2 is

located at J201. A two-wire harness for each output is provided. See Table 2 for the output connector

wire colors. The TA3020 can be operated as a two-channel single-ended amplifier, bridged mono output

amplifier (see Figure 9) or with a passive crossover for a 2.1 channel application (refer to Application Note

13). Outputs can be any passive speaker(s) or test measurement equipment with resistive load (see

Application Note 4 for more information on bench testing).

Connector Name

J101

J201

Output

White

Red

Table 2

Ground

Blue

Black

Turn-on/off Pop

To avoid turn-on pops, bring the mute from a high to a low state after all power supplies have settled. To

avoid turn-off pops, bring the mute from a low to a high state before turning off the supplies. The only

issue with bringing up the V5 last, or turning it off first, is clicks/pops. If the mute line is properly toggled

(slow turn-on, quick turn-off), then any power up sequence is acceptable. In practice, the V5 will usually

collapse before VPP and VNN. The same discussion holds true for the VN10 supply. It can collapse

before VPP or VNN though this may cause a larger turn-off pop than if the mute had been activated

before either the VN10 or V5 supply have collapsed. No damage will occur to the TA3020 if either the V5

or VN10 collapse before VPP or VNN, assuming the mute is asserted before the supplies start to

discharge.

HMUTE

There is an LED, D1, which will illuminate if a fault condition is reported. HMUTE, pin 15, will illuminate

D1 via R2, if the processor detects an over or under voltage fault, as well as an over current fault. In

addition, if MUTE is high (by removing jumper on J4), the LED will also be illuminated.

An over/under voltage fault will automatically reset (and D1 will turn off) once the supply voltage is

brought back into specification. If an over current condition occurs, cycle the MUTE pin (by removing the

jumper on J4 and then replacing it). Assuming all supplies are still within specification, the HMUTE LED

will be off and the TA3020 reference board will again amplify input signals.

3

RB-TA3020, Rev. 3.0/03.02

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