Amplifier Module
Currently, the speaker driver circuits (commonly known as speaker amplifier circuits) are mostly of two types.
Class AB
This type has a simple design, amplifying the original signal directly to drive the speaker. The advantages of this circuit are its simplicity, low cost, and no Electro-Magnetic Interference (EMI) issues. The disadvantages are poor efficiency, high power consumption, and heat generation. It is typically used in designs where power supply is not a concern and EMI is a problem (e.g., near Bluetooth devices).
Class D
This type uses the inductance-resistance phenomenon of the speaker to generate sound by switching at high speeds. Class D amplifiers are the mainstream in all speaker amplifiers, with a market share of about 80%. Its advantages are extremely high efficiency (generally 85%, with high-end models reaching up to 92%) and almost no heat generation. The drawbacks are a slightly higher price and potential EMI issues, which require special handling.
Below are several of our company’s Amplifier ICs.
LY8005UL (CLASS D) | 2.3 W Mono Filterless Class D Audio Power Amplifier with better efficiency (however, it is not suitable for driving piezoelectric buzzers). |
LY8005UL (CLASS D) | 2.3 W Mono Filterless Class D Audio Power Amplifier with better efficiency (however, it is not suitable for driving piezoelectric buzzers). |
LY8005ULT (CLASS D) | 2.3 W Mono Filterless Class D Audio Power Amplifier with better efficiency (however, it is not suitable for driving piezoelectric buzzers). |
LY8009 (CLASS D) | 5.5 W Mono Filterless Class D Audio Power Amplifier. |
LY8209 (CLASS D) | Class D Audio Power Amplifier. |
LY8010ULT (CLASS D) | 2.5 W Mono Filterless Class D Audio Power Amplifier. |
LY8210ULT (CLASS D) | Better efficiency, two-in-one (however, it is not suitable for driving piezoelectric buzzers). |
LY8322A (CLASS D) | 20Wx2(BTL) Stereo / 40Wx1(PBTL) Mono Class D Audio Amplifier with Filter Free |
AMP-25WX2 (CLASS D) | 20 W x 2 (BTL) Stereo / 40 W x 1 (PBTL) Mono Class D Audio Amplifier with Filter Free. |
LY8890ULT (CLASS AB) | Cheaper (can drive piezoelectric buzzers). |