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TDA7492

Characterization curves

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4

Characterization curves

The general test conditions used for producing the characterization curves can be

summarized as follows:

Test board: SZ LAB TDA7492 slug-up demo board

Test frequency: 1 kHz (also 100 Hz for THD vs. output power only)

Output power: 1 W



For 6-

loads

–

test voltage: 25 V

–

LC filter: L = 22 μH and C = 220 nF



For 8-

loads

–

test voltage: 25 V

–

LC filter: L = 33 μH and C = 220 nF



For 4-

loads

–

test voltage: 20 V

–

LC filter: L = 15 μH and C = 470 nF.

Figure 28 on page 22 shows the circuit with which the characterization curves, shown in the

next sections, were measured. Figure 27 on page 21 shows the PCB layout.

4.1

Characterizations for 6-

 loads

Figure 3. Output power vs. supply voltage

Test conditions:

Vcc = 15 - 25 V,

RL = 6

Ω,

Rosc = 39 k

Ω, Cosc = 100 nF,

f = 1 kHz,

Gv = 30 dB,

Tamb = 25 C

Specification limit:

Typical:

Vs = 25 V, RL = 6

Ω,

Po = 50 W atTHD = 10%,

Po = 40 W atTHD = 1%

10% THD

1% THD