Cirrus Logic公司的SA303是全集成的开关放大器,能用来驱动三相无刷DC(BLDC)马达.三个独立的半桥在MCU或DSC控制下提供超过10A峰值输出电流. SA303提供热和短路保护功能. SA303的工作电压从8.5V到60V,可用于3相无刷DC(BLDC)马达,多个DC有刷马达,和三个电磁激励器.本文介绍了SA303的主要特性,方框图, 单相输入和输出结构框图, 应用系统框图以及保护特性.

The SA303 is a fully integrated switching amplifier designed primarily to drive three-phase Brushless DC (BLDC) motors. Three independent half bridges provide over 10 amperes peak output current under microcontroller or DSC control. Thermal and short circuit monitoring is provided, which generates fault signals for the microcontroller to take appropriate action.

Additionally, cycle-by-cycle current limit offers user programmable hardware protection independent of the microcontroller. Output current is measured using an innovative low loss technique. The SA303 is built using a multi-technology process allowing CMOS logic control and complementary DMOS output power devices on the same IC. Use of P-channel high side FETs enables 60V operation without bootstrap or charge pump circuitry.

The Power Quad surface mount package balances excellent thermal performance with the advantages of a low profile surface mount package.



SA303主要特性:

Low Cost 3 Phase Intelligent Switching Amplifier

Directly Connects to Most Embedded Microcontrollers and Digital Signal Controllers

Integrated Gate Driver Logic with Dead-Time Generation and Shoot-through Prevention

Wide Power Supply Range (8.5V To 60V)

Over 10A Peak Output Current per Phase

3A Continuous Output Current per Phase

Independent Current Sensing for each Output

User Programmable Cycle-by-cycle Current Limit Protection

Over-Current and Over-Temperature Warning Signals

SA303应用:

3 phase brushless DC motors

Multiple DC brush motors

3 independent solenoid actuators



图1.SA303方框图



图2.单相输入和输出结构框图



图3.SA303应用系统框图



图4. SA303保护特性