TDA8933B データシートの表示（PDF） - NXP Semiconductors.

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TDA8933B

Class-D audio amplifer

NXP Semiconductors. 

NXP Semiconductors

TDA8933B

Class D audio amplifier

SE configuration:

Po(0.5%) = -------R--------L--------+----------R-------D--------S-----o-----n-R-------+-L---------R--------s------+----------R--------E------S-----8R------×---×--R--(--L-1----–-----t--w---(--m----i-n---)---×------f--o---s--c--)----×----V-----P------2

(2)

BTL configuration:

Po(0.5%) = -------R--------L--------+---------2----------×---------(-----RR-------L-D-------S-----o------n-------+----------R--------s-----)--2-----×-×----R-(--1-L---–-----t--w---(--m----i-n---)---×------f--o---s--c---)---×-----V----P------2

(3)

Where:

• VP = supply voltage VDDP1 − VSSP1 (V) or VDDP2 − VSSP2 (V)

• RL = load resistance (Ω)

• RDSon = drain-source on-state resistance (Ω)

• Rs = series resistance output inductor (Ω)

• RESR = Equivalent Series Resistance SE capacitance (Ω)

• tw(min) = minimum pulse width(s); 80 ns typical

• fosc = oscillator frequency (Hz); 320 kHz typical with Rosc = 39 kΩ

The output power Po at THD+N = 10 % can be estimated by:

Po(10%) = 1.25 × Po(0.5%)

(4)

Figure 7 and Figure 8 show the estimated output power at THD+N = 0.5 % and

THD+N = 10 % as a function of the supply voltage for SE and BTL configurations at

different load impedances. The output power is calculated with: RDSon = 0.38 Ω (at

Tj = 25 °C), Rs = 0.05 Ω, RESR = 0.05 Ω and IO(ocp) = 2 A (minimum).

TDA8933B_1

Preliminary data sheet

Rev. 01 — 23 October 2008

© NXP B.V. 2008. All rights reserved.

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