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SI8241 датащи(PDF) 3 Page - Silicon Laboratories |
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SI8241 датащи(HTML) 3 Page - Silicon Laboratories |
3 / 12 page 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 ---- = |
Аналогичный номер детали - SI8241 |
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Аналогичное описание - SI8241 |
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