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The non-clip function can control the gain of class-D amplifier to obtain a maximum output level (Po

=800mW,VDD=4.2v, RL=8Ω) without distortion. When the output clip which is arisen from the over

lever input signal or power supply voltage down with buttery is detected, BL6331 lowers the Gain of

the digital amplifier to an appropriate value so as not to cause the clipping at the differential signal

output. This is the difference from the traditional AGC (Auto Gain Control) or ALC (Auto Level

Control).

The non-clip performance is depended on three factors:

1、THNC(the threshold THD+N of non-clip) ：The non-clip output control circuit detects the THD+N

of output. When the THD+N of output is up to the threshold THD+N of non-clip (0.5%), the amplifier

gain is adjusted.

2、tAT (attack time) ：The time from the output clip is detected to the amplifier gain is adjusted.

Normally, attack time is 1ms～100ms。

3、tRT (release time) ：The time from the THD+N of output is lower than THNC to the amplifier gain is

back to normal level. Normally, release time is 20ms～5s。

The classic music is in well harmonious with long tAT and tRT. The rock and roll music is in well

harmonious with short tAT and tRT.

The non-clip performance is shown in the following graph：

The attack time and release time of Non-clip control are fixation two levels, and selects with the

CTRL terminal.

CTRL terminal function

BL6331

Rctrl1

Rctrl2

Cctrl

Rctrl3

CTRL1

CTRL2

0.1uF

CTRL

BL6331

R ctrl

Cctrl

0.1uF

CTRL

MCU

10Kohm

CONFIG 1 of CTRL

CONFIG 2 of CTRL

In CONFIG 1 of CTRL, by connection external resistors (Rctrl1、Rctrl2 and Rctrl3: Accuracy of 1%)

to CTRL terminal, and impression setting threshold voltage of each mode to CTRL terminal, the

following can be set: NonClip1, Nonclip2, Nonclip-off, and shutdown mode.

BL6331CP Datasheet(PDF) 3 Page - SHANGHAI BELLING CO., LTD.

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