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
l Two channel H-bridge current controlled motor driver.
–Single or two brushed DC motors
–One stepper motor
l EN/PH control interface.
l Current control is optional at fixed frequency - 2 bits current control, providing 4 current steps
– 2 bits
l A low on-impedance metal-oxide-semiconductor field-effect transistor (MOSFET)
– 24V，Ta = 25°C, to achieve a maximum drive current of 2.5A
– 24V，Ta= 25°C, RDS(on)350mΩ (typical value HS + LS)
l 8.2~45V operating voltage range
l Sleep mode Low current
l 3.3V reference voltage built in
l Surface mount package with heat sink
l Protective features
–Overcurrent Protection (OCP)
–Thermal shutoff (TSD)
–Undervoltage Block (UVLO)
–Fault display Pin (nFAULT)
Market applications
