SANYO Semiconductor HOME > Product Information > Hybrid IC (STK Series) > Audio HIC
Hybird IC (STK Series)
- Inverter HICs for Home Appliances
- Audio Power HICs
- Digital (Class-D)
- Analog (Class-AB)
Audio HIC Features
Type of Audio Power Amplifiers
Since 1970, SANYO has offered the STK series of IMSTTM hybrid ICs for audio power amplifiers onto the market, and the reliability and performance of these ICs have won a high market share for the company.
However, times are changing, and the question now asked by society is how environmentally friendly companies can be. Recent days have seen the growing introduction of home theater systems into consumers' homes spurred on by the spread of flat-panel TVs, and high levels of efficiency using digital technology are being demanded even from audio amplifiers.
Against this backdrop, SANYO has been developing audio hybrid ICs for class D amplifiers that feature high efficiency and low heat generation, audio hybrid ICs for the class AB amplifiers in ultraminiature transfer molded packages in addition to the existing hollow packages, and audio hybrid ICs for the class H "supply voltage switching" amplifiers that can achieve energy savings through high efficiency.
Class D Audio Power Amplifier
Summary
By switching between +Vcc and -Vcc power supplies, a class D audio power amplifier delivers sound through the speaker by controlling the width of 400 kHz pulses and passing the pulses though an LC filter, which converts them into audio signals. Class D amplifiers have a higher power conversion efficiency and they generate less heat than the conventional class AB amplifiers. Taking into account the fact that the increasingly smaller sizes being engineered for the products that use these amplifiers cause the heat generation to be concentrated and that the amplifiers are used in portable products, it is expected that class D amplifiers will increasingly take the place of class AB amplifiers in the products that incorporate them.
Circuit Configuration
Operational Principle Figure
Microminiature AB class Audio Power Amplifiers
Summary
Sanyo has added Smart HICs, which are now made smaller than the existing hollow packages using transfer molds, to its line-ups.
Circuit Configuration
Operational Principle Figure
Class H (Power Supply Voltage Switching) Audio Power Amplifiers
Summary
These audio power amplifiers save power by using a high supply voltage when the level of the input audio signals is high, and a low supply voltage when the input audio signals is low. Since two different supply voltages must be switched, their circuitry is complex, and noise problems have resulted. SANYO has developed these hybrid ICs using its IMSTTM technology to solve these problems.
Circuit Configuration
Operational Principle Figure
