TDF8590TH 查看數據表（PDF） - NXP Semiconductors.

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TDF8590TH

2 × 80 W SE (4 Ω) or 1 × 160 W BTL (8 Ω) class-D amplifier

NXP Semiconductors. 

NXP Semiconductors

TDF8590TH

2 × 80 W SE (4 Ω) or 1 × 160 W BTL (8 Ω) class-D amplifier

The TDF8590TH contains two independent amplifier channels with a differential input

stage, high output power, high efficiency (90 %), low distortion and a low quiescent

current. The amplifier channels can be connected in the following configurations:

• Mono Bridge-Tied Load (BTL) amplifier

• Dual Single-Ended (SE) amplifiers

The TDF8590TH also contains circuits common to both channels such as the oscillator, all

reference sources, the mode functionality and a digital timing manager. For protection a

thermal foldback, temperature, current and voltage protection are built in.

6.2 Mode selection

The TDF8590TH can be switched in three operating modes via pin MODE:

• Standby mode; the amplifiers are switched off to achieve a very low supply current

• Mute mode; the amplifiers are switching idle (50 % duty cycle), but the audio signal at

the output is suppressed by disabling the VI-converter input stages

• Operating mode; the amplifiers are fully operational with output signal

The input stage (see Figure 1) contributes to the DC offset measured at the amplifier

output. To avoid pop noise the DC output offset voltage should be increased gradually at a

mode transition from mute to operating, or vice versa, by limiting the dVMODE/dt on pin

MODE, resulting in a small dVO(offset)/dt for the DC output offset voltage. The required time

constant for a gradually increase of the DC output offset voltage between mute and

operating is generated via an RC network on pin MODE. An example of a switching circuit

for driving pin MODE is illustrated in Figure 3 and explained in Table 3.

VDDP

5.6 kΩ

5.6 kΩ

5.6 V

S1

Fig 3. Example of mode selection circuit

MODE

5.6 kΩ

S2

100 µF

(10 V)

SGND

001aad836

Table 3.

S1

closed

closed

open

open

Mode selection

S2

closed

open

closed

open

Mode selection

Standby mode

Standby mode

Mute mode

Operating mode

TDF8590TH_2

Product data sheet

Rev. 02 — 23 April 2007

© NXP B.V. 2007. All rights reserved.

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