昂赛微马达驱动AS5970扫地机替代TI DRV8837/DRV8870

General Description
The AS5970 device is a brushed-DC motor driver
for printers, appliances, industrial equipment, and other
small machines. Two logic inputs control the H bridge
driver, which consists of four N-channel MOSFETs that
can control motors bidirectionally with up to 3.6A peak
current. The inputs can be pulse width modulated
(PWM) to control motor speed, using a choice of
current-decay modes. Setting both inputs low enters a
low-power sleep mode. Input terminals are provided for
use in controlling the speed and direction of a DC
motor with externally applied PWM control **s.
Internal synchronous rectification control circuitry is
provided to lower power dissipation during PWM
operation.
The AS5970 device features integrated current
regulation, based on the analog input VREF and the
voltage on the ISEN pin, which is proportional to motor
current through an external sense resistor. The ability
to limit current to a known level can significantly reduce
the system power requirements and bulk capacitance
needed to maintain stable voltage, especially for motor
startup and stall conditions.
The device is fully protected from faults and short
circuits, including undervoltage (UVLO), overcurrent
(OCP), and overtemperature (TSD). When the fault
condition is removed, the device automatically
resumes normal operation.
The AS5970 contain a thermal management
system to protect the device; and a cycle-by-cycle
current limit prevents damage to the AS5970. Built-in
circuitry prevents excessive inrush current during
start-up. The shutdown feature reduces quiescent
current to less than 1.0μA.
The device is available in ePAD 8-pin SOP
package and is rated over the -40°C to 85°C.