Motor chip


Chip Introduction

The SS8813 provides a dual channel integrated motor drive solution for printers and other motor integration applications. The SS8813 has two H-bridge drives, each providing a maximum peak current of 2.5A and a root mean square current of 1.75A(at 24V and Ta = 25°C with appropriate cooling conditions), which can drive two brush DC motors, or a bipolar stepper motor, or a solenoid or other inductive load. Bipolar stepper motors can be operated in full step, 2 subdivision, 4 subdivision, or with software for high subdivision.

The power output module of each H-bridge of the SS8813 consists of N-type power MOSFETs. Each H-bridge contains a rectifier circuit and a current limiting circuit. Simple parallel digital control interface, attenuation mode can be selected for fast attenuation, slow attenuation and hybrid attenuation.

The SS8813 provides a low-power sleep mode to turn off the internal circuitry to achieve very low static current. This sleep mode is achieved by setting the nSLEEP pin. The internal shut-off function contains overcurrent protection, short circuit protection, undervoltage lock protection and overtemperature protection, and provides a fault output pin nFAULT pin

The SS8813 is available in an ETSSOP28 package with a bare pad for improved heat dissipation and is lead-free with 100% wuxi plating on the pin frame.

Chip characteristics

Two channel H-bridge current controlled motor driver.

–Single or two brushed DC motors

–One stepper motor

EN/PH control interface.

Current control is optional at fixed frequency - 2 bits current control, providing 4 current steps

– 2 bits

A low on-impedance metal-oxide-semiconductor field-effect transistor (MOSFET)

– 24VTa = 25°C, to achieve a maximum drive current of 2.5A

– 24VTa= 25°C, RDS(on)350mΩ (typical value HS + LS)

8.2~45V operating voltage range

Sleep mode Low current

3.3V reference voltage built in

Surface mount package with heat sink

Protective features

–Overcurrent Protection (OCP)

–Thermal shutoff (TSD)

–Undervoltage Block (UVLO)

                 –Fault display Pin (nFAULT)

Market applications