HCA600ACREF 查看數據表（PDF） - Intersil

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HCA600ACREF

600W/1000W Full Bandwidth Class D Amplifier

Intersil 

HCA600ACREF

Typical Performance Curves

1

400W

0.1

0.01

20W

0.001

0.0005

10

100

1k

FREQUENCY (Hz)

10k 30k

FIGURE 1. THD +N (%) vs FREQUENCY LOAD = 8Ω

1.000

0.0

-1.000

LOAD = 8Ω

LOAD = 4Ω

-2.000

-3.000

-4.000

-5.000

-6.000

10

100

1k

10k

80k

FREQUENCY (Hz)

FIGURE 2. AMPLIFIER FREQUENCY RESPONSE

10W - LOAD = 8Ω

AMPLIFIER OUTPUT vs INPUT

90 LOAD = 8Ω

78

R= ∞

1012

760

65

R = 20K 528

R = 10K

52

338

39

190

26.0

84

13.0

21

0.0

0.0

0.0 0.6 0.12 0.18 2.4 3.0 3.6 4.2 4.8 5.2 6.0

INPUT VOLTAGE (VRMS)

FIGURE 3. AMPLIFIER TRANSFER CHARACTERISTIC WITH

VARIOUS SETTINGS OF SOFT CLIPPING

RESISTOR

Soft Clipping

Figures 3, 4 and 5 show the effects of the soft clipping

circuitry within the amplifier. Figure 3 shows the transfer

characteristic of the amplifier for various values of the soft

clipping programming resistor. An important aspect of soft

clipping is the apparent increase in sound level. As soft

clipping is reached, the upper and lower envelop of the

sinewave is gradually reduced. This “soft” rounding reduces

the higher harmonics that would result if hard clipping as

shown in Figure 5 was enabled. Soft clipping also results in

an amplifier with a more pleasing sound. Figure 4 shows the

rounding of the output with soft clipping, while Figure 5

shows the ampler output without soft clipping.

DSA 602A DIGITIZING SIGNAL ANALYZER

1ms/DIV

FIGURE 4. OSCILLOSCOPE DISPLAY OF AMPLIFIER

OUTPUT WITH SOFT CLIPPING CIRCUIT

ENABLED

DSA 602A DIGITIZING SIGNAL ANALYZER

1ms/DIV

FIGURE 5. OSCILLOSCOPE DISPLAY OF AMPLIFIER

OUTPUT WITH SOFT CLIPPING CIRCUIT

DISABLED

5

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