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SI8241 датащи(PDF) 3 Page - Silicon Laboratories

номер детали SI8241
подробное описание детали  PERFORMANCE IMPROVEMENTS IN CLASS D AUDIO AMPLIFIERS
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производитель  SILABS [Silicon Laboratories]
домашняя страница  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI8241 датащи(HTML) 3 Page - Silicon Laboratories

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AN542
Rev. 0.1
3
3. Gate Drive Structure
Figure 2 illustrates the simplicity of the Si8241 driving a two-state, half-bridge Class D amplifier. The boot supply
tied to D1 must be 12 V higher than the –50 V reference (–38 V) so that the MOSFETs each have a 12 V drive
signal.
Figure 2. Si8241 Audio Gate Driver Gate Drive Circuit
4. Filter Inductor Selection
In early Class D amplifiers, the most common type of inductor used was a toroid of Type 2 iron material
manufactured by Micrometals (Figure 3). This was because Type 2 material has a very low magnetic permeability
(µ in Equation 2), slightly higher than an air core inductor, which has a linear BH curve and will not saturate.
Equation 2. Magnetic Permeability
However, when an iron core inductor operates further up on the BH curve, its permeability decreases with the
falling slope of the BH curve and approaches zero as the core saturates. When this happens, there are no more
iron particles to align within the core, and the inductance approaches zero.
Recently, a number of manufacturers developed inductors specifically for Class D amplification, such as Sagami
Elec. Co., whose inductors are used in the Silicon Labs Class D reference design. The inductance value of these
devices does not decrease with current as happens in most inductors. Instead, it remains relatively flat over the
range of interest and is a good choice for Class D amplifier applications.
Figure 3. Micrometal Inductor BH Plot
Si8241
ISOdriver
-38V
PWM
NC
VDDI
GNDI
DISABLE
DT
NC
VDDI
VDDA
VOA
GNDA
NC
NC
VDDB
VOB
GNDB
-50V
+50V
C1
C3
PWM
+5V
C2
SHDN_HI
R3
C4
D1
R1
R2
-38V
Speaker
B
H
----
=


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