TDF8599TH datasheet(35/52 Pages) NXP

35 / 52 page

TDF8599_1

Product data sheet

Rev. 01 — 13 November 2008

35 of 52

NXP Semiconductors

TDF8599

Class-D power ampliﬁer with load diagnostics

14.2 Output power estimation (Parallel mode)

Figure 29 and Figure 30 show the estimated output power at THD = 0.5 % and

THD = 10 % as a function of the supply voltage for different load impedances in parallel

mode.

14.3 Output current limiting

The peak output current is internally limited to 8 A maximum. During normal operation, the

output current should not exceed this threshold level otherwise the output signal will be

distorted. The peak output current can be estimated using the following equation:

(6)

• Io = output current (A)

• VP = supply voltage (V)

• RL = load impedance (Ω)

• RDSon = on-resistance power switch (Ω)

• RS = series resistance output inductor (Ω)

Example: A 1

Ω speaker can be used with a supply voltage of 11 V before current limiting

is triggered.

Current limiting (clipping) avoids audio holes but can cause distortion similar to voltage

clipping. In Parallel mode, the output current is internally limited above 16 A.

THD = 0.5 %.

(1) RDSon = 0.06 Ω (at Tj =25 °C), RS = 0.0125 Ω,

tW(min) = 130 ns and IO(ocp) = 16 A (minimum).

(2) RL =1 Ω.

(3) RL =2 Ω.

(4) RL =4 Ω.

THD = 10 %.

(1) RDSon = 0.06 Ω (at Tj =25 °C), RS = 0.0125 Ω,

tW(min) = 130 ns and IO(ocp) = 16 A (minimum).

(2) RL =1 Ω.

(3) RL =2 Ω.

(4) RL =4 Ω.

Fig 29. Po as a function of Vp in parallel mode with

THD = 0.5 %

Fig 30. Po as a function of Vp parallel mode with

THD = 10 %

VP (V)

818

(1)

001aai798

120

160

(W)

(3)

(2)

VP (V)

818

(1)

001aai799

120

160

(W)

(3)

(2)

RSon

()

------------------------------------------------------

8 A

≤≤

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