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TDF8590TH Datasheet(PDF) 4 Page - NXP Semiconductors |
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TDF8590TH Datasheet(HTML) 4 Page - NXP Semiconductors |
4 / 30 page TDF8590TH_2 © NXP B.V. 2007. All rights reserved. Product data sheet Rev. 02 — 23 April 2007 4 of 30 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. Fig 3. Example of mode selection circuit Table 3. Mode selection S1 S2 Mode selection closed closed Standby mode closed open Standby mode open closed Mute mode open open Operating mode 001aad836 5.6 k Ω 5.6 k Ω 5.6 V 5.6 k Ω S1 S2 MODE SGND 100 µF (10 V) VDDP |
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