TDA8932T-T View Datasheet(PDF) - NXP Semiconductors.

Part Name

Description

Manufacturer

TDA8932T-T

Class-D audio amplifier

NXP Semiconductors. 

NXP Semiconductors

TDA8932

Class-D audio amplifier

14. Application information

14.1 Output power estimation

The output power Po at THD+N = 0.5 %, just before clipping, for the SE and BTL

configuration can be estimated using Equation 2 and Equation 3.

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----------×---------(----R-R------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 impedance [Ω]

RDSon = on-resistance power switch [Ω]

Rs = series resistance output inductor [Ω]

RESR = equivalent series resistance SE capacitor [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 = 0.15 Ω (at

Tj = 25 °C), Rs = 0.05 Ω, RESR = 0.05 Ω and IO(ocp) = 4 A (minimum).

TDA8932_2

Preliminary data sheet

Rev. 02 — 12 December 2006

© NXP B.V. 2006. All rights reserved.

23 of 45

Share Link: