HA13150A Datasheet, PDF (8/15 Pages) Hitachi Semiconductor – 21 W X 4-Channel BTL Power IC

HA13150A
2. How to reduce the popping noise by Muting circuit
At normal operating circuit, Muting circuit operates at high speed under 1 µs.
In case popping noise becomes a problem, it is possible to reduce the popping noise by connecting
capacitor, which determines the switching time constant, between pin 10 and GND. (Following
figure 2)
We recommend value of capacitor greater then 1 µF.
Also transitional popping noise can be reduced sharply by muting before V_CC and Standby are
ON/OFF.
Table 1
C (µF)
nothing
0.47
4.7
Figure 2 How to use Muting Circuit
Muting ON/OFF Time
ON Time
under 1 µs
2 ms
19 ms
OFF Time
under 1 µs
2 ms
19 ms
8