L6227Q

L6227Q DMOS dual full bridge driver with PWM current controller Features Operating supply voltage from 8 to 52 V 2.8 A output peak current (1.4 A DC) R 0.73 typ. value T = 25 C DS(on) J Operating frequency up to 100 kHz VFQFPN32 5 mm x 5 mm Non dissipative overcurrent protection Dual independent constant t PWM current OFF Description controllers Slow decay synchronous rectification The L6227Q is a DMOS dual full bridge designed for motor control applications, realized in Cross conduction protection BCDmultipower technology, which combines Thermal shutdown isolated DMOS power transistors with CMOS and Under voltage lockout bipolar circuits on the same chip. The device also includes two independent constant off time PWM Integrated fast free wheeling diodes current controllers that performs the chopping regulation. Available in VQFPN32 5 mm x 5 mm Applications package, the L6227Q features a non-dissipative overcurrent protection on the high side power Bipolar stepper motor MOSFETs and thermal shutdown. Dual or quad DC motor Figure 1. Block diagram VBOOT V BOOT VS A V V BOOT BOOT CHARGE VCP PUMP OVER OCD A CURRENT DETECTION OUT1 A OUT2 A 10V 10V THERMAL PROTECTION EN GATE A LOGIC IN1 A SENSE A IN2 A PWM VOLTAGE REGULATOR + ONE SHOT MASKING MONOSTABLE TIME VREF SENSE - A COMPARATOR 10V 5V RC A BRIDGE A VS B OVER OUT1 CURRENT B OCD B DETECTION OUT2 B SENSE B GATE EN VREF B B LOGIC RC IN1 B B IN2 BRIDGE B B D99IN1085A January 2009 Rev 3 1/27 www.st.com 27Contents L6227Q Contents 1 Electrical data 3 1.1 Absolute maximum ratings . 3 1.2 Recommended operating conditions . 3 1.3 Thermal data . 4 2 Pin connection 5 3 Electrical characteristics . 7 4 Circuit description 10 4.1 Power stages and charge pump 10 4.2 Logic inputs . 11 4.3 Truth table . 12 4.4 PWM current control . 12 4.5 Slow decay mode . 15 4.6 Non-dissipative overcurrent protection . 16 4.7 Thermal protection 18 5 Application information . 19 6 Output current capability and IC power dissipation 21 7 Thermal management . 22 8 Package mechanical data 23 9 Order codes . 25 10 Revision history . 26 2/27