L6227Q Datasheet, PDF (1/27 Pages) STMicroelectronics – DMOS dual full bridge driver with PWM current controller

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_DS(on) 0.73 Ω typ. value @ T_J = 25 °C
■ Operating frequency up to 100 kHz
■ Non dissipative overcurrent protection
■ Dual independent constant t_OFF PWM current
controllers
■ Slow decay synchronous rectification
■ Cross conduction protection
■ Thermal shutdown
■ Under voltage lockout
■ Integrated fast free wheeling diodes
Applications
■ Bipolar stepper motor
■ Dual or quad DC motor
VFQFPN32 5 mm x 5 mm
Description
The L6227Q is a DMOS dual full bridge designed
for motor control applications, realized in
BCDmultipower technology, which combines
isolated DMOS power transistors with CMOS and
bipolar circuits on the same chip. The device also
includes two independent constant off time PWM
current controllers that performs the chopping
regulation. Available in VQFPN32 5 mm x 5 mm
package, the L6227Q features a non-dissipative
overcurrent protection on the high side power
MOSFETs and thermal shutdown.
Figure 1. Block diagram
VBOOT
VCP
V_BOOT
CHARGE
PUMP
OCD_A
EN_A
IN1_A
IN2_A
THERMAL
PROTECTION
VOLTAGE
REGULATOR
10V 5V
EN_B
IN1_B
IN2_B
June 2008
OCD_B
V_BOOT
V_BOOT
VS_A
OVER
CURRENT
DETECTION
10V
GATE
LOGIC
ONE SHOT
MONOSTABLE
OVER
CURRENT
DETECTION
GATE
LOGIC
Rev 2
10V
PWM
MASKING
TIME
+
SENSE
-
COMPARATOR
BRIDGE A
BRIDGE B
D99IN1085A
OUT1_A
OUT2_A
SENSE_A
VREF_A
RC_A
VS_B
OUT1_B
OUT2_B
SENSE_B
VREF_B
RC_B
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