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  • What's a Class D speaker amp and how does it differ from an analog amp?
    • The Class D speaker amp's drive output stage utilizes high efficiency PWM drive (H or L) based on the output signal level. This results in low power loss and high efficiency (85-90%).In contrast, conventional analog amps feature Class AB output, requiring (among other things) a bias current. The result is low efficiency and high heat generation, requiring an external heat sink.
  • Is an output LC filter required?
    • Based on the application a simple filter (i.e. ferrite beads, ceramic capacitor) can be used. For example, active speakers used for compact LCDs or iPod docks are products that use short speaker cables, while large-screen LCDs require longer speaker cables, resulting in the generation of unwanted radiation (EMI) requiring countermeasures (i.e. filters).
  • What is BTL output method?
    • It is the abbreviation of Bridge Tied Load.
      It reverses the speaker both terminals to connect by using two amplifier circuits compared with a usual single amplifier. If without output coupling capacitor,it may has an advantage that output electric power quadruples.
  • How about the package?
    • Wafer Level CSP product (Min 1.5mm mouth) is best for the application as cellular phone etc that especially high density are demanded. Moreover, there are some space on PCB, and we also prepare usual plastic molding products with eight pins VSON packag for the customer who wants it.
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