All-in-One BLDC-Motor Controller Adds Smart Features, Cuts Design Time

As an easy-to-use integrated solution for motor control, the AH5792 from Diodes Incorporated includes a Hall sensor and amplifier, a full-bridge output driver, and on-chip digital control with value-added features including locked-rotor protection.

With its bi-directional H-bridge output stage, the AH5792 provides a simple solution for low-power single-phase, full-wave Brushless DC (BLDC) motor control. The Hall sensor element is located in the centre of the 0.6mm-high, small-outline SOT553 package, which can be built into miniature systems such as ultra-thin cooling fans. These types of applications will also benefit from the AH5792’s low-voltage start-up capability.

The embedded digital controller eliminates the need for external components including a timing capacitor. Built-in features include locked-rotor detection with automatic selfrestart. This shuts down the output driver in the event of a locked rotor and then restarts the motor when the rotor is freed. The frequency-generator output produces a tachometer-like signal that can be easily connected to external speed-monitoring hardware.

 

FEATURES 1.7mm x 1.7mm footprint Operating voltage range: 1.8V to 5V 400mA output-current capability 230mW power dissipation @ 25°C ambient temperature

APPLICATIONS 3.3V/5V, eight-pole DC fans Low-voltage motors Micro-vibration motors

 

 

Diodes Incorporated / AH5792