STK621-739B-E

Series:	*
Part Status:	Obsolete

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PMIC - Motor Drivers, Controllers The STK621-739B-E is a power integrated circuit (IC) designed to control the speed and direction of small DC indoor motors. This device is widely used in home appliance applications like fans, pumps, or small tools (drills, mixers, etc.). In addition to speed and direction control, the IC also provides muscle isolation and protection from motor over-temperature and motor overload conditions, making it a perfect solution for motor control in home appliances.The STK621-739B-E integrates several peripheral circuits, such as a built-in sense resistor and diode, a body diode, a pre-biased low power consumption 6A-output driver, a PWM control circuit, an LED indicator, and a rectifier. The body diode provides a path for motor current to flow if an external switch is used to provide motor direction control. The LED indicator is used to monitor the motor status (on/off, direction, etc.) and has a built-in voltage booster. This IC includes two PWM (pulse width modulation) inputs, which are used to accurately control the speed and direction of DC motors. These two PWM inputs can be used in either a direct speed mode or a full control mode. In the direct speed mode, the motor speed is controlled based on a single PWM input, while in the full control mode, the motor speed is controlled using two PWM inputs. To ensure extremely smooth motor operation at low motor speeds, the IC utilizes built-in switching frequency shifting and duty cycle control.The IC is also designed with several protection features to protect the motor from excessive current flows, over-heating, and overload conditions. It includes a built-in over-current protection circuit which reduces the current flow to the motor when it is approaching its rated current level. Additionally, the IC is protected against over-heating by a built-in thermal shut-down circuit, which automatically turns off the motor if the internal temperature gets too high. The STK621-739B-E is a cost-effective and reliable device which can be used in a wide range of applications and provides high performance in motor control and protection. Its integrated peripheral components reduce the complexity and cost of system design and allow for easy implementation of motor speed and direction control. Its built-in protection circuits ensure reliable and consistent operation, even in extreme conditions.

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