Cirrus Logic's SA57U is a fully integrated, low-cost smart switching amplifier designed to drive DC brushless motors. Two half-bridge circuits provide over 15A of peak output current under MCU or DSC controllers. The SA57U also provides heat and short circuits. Protection function. SA57U can be directly connected to most embedded microcontrollers or digital signal controllers. Operating voltage from 8.5V to 60V, can be used for bidirectional DC brush motor, 2 unidirectional DC brush motor, 2 independent electromagnetic coil excitation And Stepper Motors. This article describes the main features of the SA57U, the block diagram, the motor control system block diagram, and the SA57-IHZ demo board circuit diagram and bill of materials.
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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.
Ambient, 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 enable 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.
Main features of SA57U:
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 application:
Bidirectional DC brush motors
2 unidirectional DC brush motors
2 independent electromagnetic actuators
Stepper motors
Figure 1. Block diagram of the SA57U
Figure 2. Block diagram of the SA57U motor control system
SA57-IHZ Demo Board
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.
Figure 3. Outline drawing of the SA57-IHZ demo board
Figure 4. Circuit diagram of the SA57-IHZ demo board
SA57-IHZ Demo Board Bill of Materials (BOM):
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