DocID025039 Rev 1

19/27

AN4339

Description

27

1.4

BLDC motor driver - L6235 details

Motor specifications are



3-phase BLDC motor



DC input voltage: 24 V



Typical operating current: 1 A



3 Hall sensor detection method

To drive the BLDC motor with Hall effect sensors incorporated, the L6235 device is used.

The L6235 device is a DMOS fully integrated 3-phase motor driver with overcurrent

protection. The device combines isolated DMOS power transistors with CMOS and bipolar

circuits on the same chip. The device includes all the circuitry needed to drive a 3-phase

BLDC motor including: a 3-phase DMOS bridge, a constant off time PWM current controller

and the decoding logic for single ended Hall sensors that generates the required sequence

for the power stage. The L6235 device features a non-dissipative overcurrent protection on

the high side Power MOSFETs and thermal shutdown. Some of the important features of the

driver are listed below:



Operating supply voltage from 8 to 52 V



5.6 A output peak current (2.8 ADC)





Operating frequency up to 100 KHz



Non dissipative overcurrent, detection and protection



Diagnostic output





Slow decay synchronous. rectification



60° and 120° Hall effect decoding logic



Brake function



TACHO output for speed loop



Cross conduction protection



Thermal shutdown



Undervoltage lockout



Integrated fast freewheeling diodes