AW8110CSR datasheet(12/14 Pages) AWINIC

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AW8110 Datasheet

June 2010 V1.3

Page 12 of 14

NCN Function

In audio application, output signal will be unde-

sirable distortion caused by too large input and

power supply voltage down with battery, and

clipped output signal may cause permanent

damage to the speaker. The AW8110 features

unique Non-Crack-Noise (NCN) Function, which

adjusts system gain automatically to generate de-

sired output

by detecting the “Crack” distortion of

output signal, protects the speaker from damage

at high power levels and brings the most com-

fortable listening experience to the customers.

Attack Time is the time it takes to reduce the gain

after the output has clipped.

Release Time is the time it takes for the gain to

return to its normal level after clipped.

Table 1 NCN Parameter

Attack Time

Release Time

45ms

2.6s

Output signal if no power supply limit

Output signal in NCNOFF

mode

Output signal in NCNON mode

Release Time

Attack Time

Figure 6 NCN Function Diagram

Efficiency

Efficiency of a Class D amplifier is attributed to the

switching operation of the output stage transistors.

In a Class D amplifier, the output transistors act as

current steering switches and consume negligible

additional power. Any power loss associated with

the Class D output stage is mostly due to the I

loss of the MOSFET on-resistance and supply

current. The AW8110 features efficiency of 90%.

Protection Function

When a short-circuit occurs between VOP/VON

pin and VDD/GND or VOP and VON, the

over-current circuit shutdown the device, pre-

venting the device from being damaged. When

the condition is removed, the AW8110 reactivate

itself. When the junction temperature is high, the

over-temperature circuit shutdown the device.

The circuit switches back to normal operation

when the temperature decreases to safe levels.

The UVLO circuit will shutdown the device when

power supply is low. AW8110 wake-up again

when power supply becomes high.

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