L6235QTR

L6235Q DMOS driver for 3-phase brushless dc motor Features Operating supply voltage from 8 to 52 V 5.6 A output peak current R 0.3 typ. value T = 25 C DS(on) J QFN-48 (7 x 7 mm) Operating frequency up to 100 kHz Non-dissipative overcurrent protection Description Diagnostic output Constant t PWM current controller The L6235Q is a DMOS fully integrated 3-phase OFF motor driver with overcurrent protection. Realized Slow decay synchronous rectification in BCDmultipower technology, the device 60 and 120 Hall effect decoding logic combines isolated DMOS power transistors with Brake function CMOS and bipolar circuits on the same chip. The device includes all the circuitry needed to drive a Tacho output for speed loop 3-phase BLDC motor including: a 3-phase DMOS Cross conduction protection bridge, a constant OFF time PWM current Thermal shutdown controller and the decoding logic for single ended Hall sensors that generates the required Undervoltage lockout sequence for the power stage. Available in Integrated fast freewheeling diodes QFN48 7x7 package, the L6235Q features a non- dissipative overcurrent protection on the high-side power MOSFETs and thermal shutdown. Figure 1. Block diagram V BOOT VS A VBOOT V BOOT CHARGE THERMAL VCP PUMP PROTECTION OCD1 OUT 1 DIAG 10V OCD1 OCD OCD2 OCD3 OCD V EN BOOT BRAKE FWD/REV OCD2 OUT 2 H GATE 10V 3 LOGIC HALL-EFFECT SENSORS H 2 DECODING LOGIC SENSE A V H BOOT VS 1 B TACHO RCPULSE OCD3 MONOSTABLE OUT 3 10V TACHO 10V 5V SENSE B PWM VOLTAGE + REGULATOR ONE SHOT MASKING MONOSTABLE TIME - VREF SENSE COMPARATOR RCOFF AM02555v1 November 2011 Doc ID 018997 Rev 2 1/33 www.st.com 33Contents L6235Q Contents 1 Electrical data 3 1.1 Absolute maximum ratings . 3 1.2 Recommended operating conditions . 3 2 Pin connection 4 3 Electrical characteristics . 6 4 Circuit description . 9 4.1 Power stages and charge pump . 9 4.2 Logic inputs . 10 4.3 PWM current control . 11 4.4 Slow decay mode . 15 4.5 Decoding logic . 15 4.6 Tacho 16 4.7 Non-dissipative overcurrent detection and protection . 18 4.8 Thermal protection 22 5 Application information . 23 6 Output current capability and IC power dissipation 25 7 Thermal management . 26 8 Electrical characteristics curves 27 9 Package mechanical data 29 10 Order codes . 31 11 Revision history . 32 2/33 Doc ID 018997 Rev 2