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SI8241 데이터시트(PDF) 2 Page - Silicon Laboratories

부품명 SI8241
상세설명  PERFORMANCE IMPROVEMENTS IN CLASS D AUDIO AMPLIFIERS
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제조업체  SILABS [Silicon Laboratories]
홈페이지  http://www.silabs.com
Logo SILABS - Silicon Laboratories

SI8241 데이터시트(HTML) 2 Page - Silicon Laboratories

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AN542
2
Rev. 0.1
2. The Si8241 Audio Gate Driver
Every so often, a new IC is introduced that challenges the current technological hegemony. With features that
make these products the perfect drivers for Class D amplification, the Silicon Labs Si8241/44 Audio Gate Drivers
represent a new standard for the Class D amplifier industry. Key features are outlined in the following sections.
2.1. Programmable Dead Time
It is well documented that a precise dead time setting is critical in Class D amplifiers. During dead time, both the
high-side and low-side MOSFETs are off. However, the low-side MOSFET body diode continues to conduct
current, which manifests itself as output distortion. Too short a dead time causes shoot-through current that
reduces system efficiency; too long a dead time increases THD, negatively impacting audio quality. While
competing audio drivers typically have coarse, digital dead-time settings (i.e. 1 of n delay values), the Si8241/44
Audio Gate Drivers have a precise linear dead time setting that programs with a single external resistor. This
feature provides the resolution necessary to precisely set dead time for optimal system performance. The Audio
Gate Driver dead time equation is shown in Equation 1.
Equation 1. Audio Gate Driver Dead Time
Per Equation 1, the Silicon Labs Class D amplifier uses a 2 k
 resistor to generate 20 ns of dead time. Changing
this dead time value to 18 ns only requires changing the RDT to 1.8 k
 (connected from the dead-time pin (DT)
input to ground). This setting mechanism allows dead time to be incrementally increased or decreased in
nanosecond increments, instead of tens of nanoseconds like competitive products.
2.2. Input/Output Isolation
Implementing a two-state, Class D amplifier can be difficult due to input level shifting requirements, and most
available Class D drivers lack the capability to eliminate level shifting. Drivers that do eliminate level shifting have
other peculiarities making them less-than-ideal for Class D operation (example: driver output ground terminal
referenced to the –VBUS rail, requiring the input drive signal to be level-shifted). This is not the case with the
Si8241 Audio Gate Driver where the isolation (i.e. level shift function) is implemented internally and is transparent
to the user. The Si8241 Audio Gate Driver controlled by TTL input signal levels drives the outputs to ±VBUS, and
only a single TTL PWM input signal is required to drive a two-state Class D amplifier.
2.3. High-Voltage Outputs
The Si8241 is capable of switching very high voltages (up to a 1,500 Vdc peak driver-to-driver differential voltage is
possible) allowing a ±750 VBUS. For practical Class D amplifier designs, a voltage of ±100 Vdc can deliver an
astounding 600 W of audio power into 8
.
2.4. Output Current Drive
Class D amplifier switching MOSFETs should not be "slammed" on and off by excessively high current gate drivers.
With its 0.5 A peak current outputs, the Si8241 Audio Gate Driver hits the sweet spot for Class D operation up to
400 W. Power levels beyond 400 W typically require larger MOSFETs and, consequently, more gate drive. For
applications of this type, the Si8244 (4A) Audio Gate Driver provides the required added gate drive, where rise and
fall times can be adjusted with a series gate resistor.
2.5. High-Frequency Operation
One of the best attributes of the Si8241 Audio Gate Driver is its 8 MHz maximum switching frequency, making it the
fastest driver on the market for Class D operation. The Silicon Labs Class D reference design operates at
approximately 500 kHz, and operating the amplifier between 500 kHz and 1 MHz dramatically reduces the high-
frequency artifacts, resulting in a remarkably clean audio waveform.
DT
10R
DT
where Dead Time (DT) is in ns and R
DT is in k
=


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