Cirrus SA57U直流電刷電機驅動方案

Cirrus Logic公司的SA57U是全集成的低成本智能開關放大器,設計用于驅動直流無刷電機.兩個半橋電路在MCU或DSC控制器下提供超過15A的峰值輸出電流. SA57U還提供熱和短路保護功能.SA57U能直接連接到大多數的嵌入微控制器或數字信號控制器.工作電壓從8.5V到60V,可用于雙向DC電刷電機,2單向DC電刷電機,2獨立電磁線圈激勵器和步進電機.本文介紹了SA57U的主要特性, 方框圖,馬達控制系統方框圖以及SA57-IHZ演示板電路圖和材料清單。

The SA57 is a fully integrated switching amplifier designed primarily to drive DC brush motors. Two independent half bridges provide over 15 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 SA57 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.

SA57U 主要特性:

Low cost 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 15A peak output current per phase

5A continuous output current per phase 8A continuous for A-Grade (SA57A)

Independent current sensing for each output

User programmable cycle-by-cycle current limit protection

Over-current and over-temperature warning signals

SA57U應用:

Bidirectional DC brush motors

2 unidirectional DC brush motors

2 independent solenoid actuators

Stepper motors

圖1.SA57U方框圖

圖2.SA57U馬達控制系統方框圖

SA57-IHZ演示板

Demonstration Board for the SA57-IHZ

The DB63 is designed to demonstrate the capabilities of the SA57 DC brush motor driver IC. This fully assembled demonstration allows the user to directly control the speed and direction of the motor. An onboard circuit controls the direction and provides four quadrant PWM signals to control the power outputs of the SA57. LEDs provide feedback for motor control status and fault indications. Provisions on the DB63 allow the user to bypass the onboard control circuit and directly interface with the SA57 motor driver.

The DB63 demonstrates proper layout techniques for the SA57 high current switching amplifier. The economical construction uses only a two-sided PCB and allows the SA57 to deliver peak currents of over 1kW.

圖3.SA57-IHZ演示板外形圖

圖4.SA57-IHZ演示板電路圖

SA57-IHZ演示板材料清單(BOM):