TDF8599B datasheet(34/54 Pages) NXP

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NXP Semiconductors

TDF8599B

I2C-bus controlled dual channel 43 W/2 Ohm, single channel 85 W/1 Ohm class-D power amplifier with

load diagnostics

TDF8599B

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Product data sheet

Rev. 2 — 23 August 2016

34 / 54

VP (V)

(1)

(2)

001aak227

120

150

(W)

(3)

THD = 0.5 %

RDSon = 0.1 Ω (at Tj = 100 °C), Rs = 0.025 Ω,

tw(min) = 190 ns and IO(ocp) = 16 A (minimum).

(1) RL = 1 Ω.

(2) RL = 2 Ω.

(3) RL = 4 Ω.

Figure 28. Po as a function of VP in stereo mode with

THD = 0.5 %

VP (V)

(1)

(3)

001aak228

120

180

150

(W)

(2)

THD = 10 %

RDSon = 0.1 Ω (at Tj = 100 °C), Rs = 0.025 Ω,

tw(min) = 190 ns and IO(ocp) = 16 A (minimum).

(1) RL = 1 Ω.

(2) RL = 2 Ω.

(3) RL = 4 Ω.

Figure 29. Po as a function of VP in stereo mode with

THD = 10 %

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 Equation 6:

(6)

• Io = output current (A)

• VP = supply voltage (V)

• RL = load impedance (Ω)

• RDSon = on-resistance of power switch (Ω)

• Rs = series resistance of output inductor (Ω)

Example: A 2 Ω speaker can be used with a supply voltage of 19 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.

14.4 Speaker configuration and impedance

A flat-frequency response (due to a 2nd order Butterworth filter) is obtained by changing

the low-pass filter components (LLC, CLC) based on the speaker configuration and

impedance. Table 22 shows the required values.

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