STMicroelectronics Demonstration board using a dual full-bridge L6227Q EVAL6227QR EVAL6227QR Data Sheet

January 2009

Rev 3

1/27

27

DMOS dual full bridge driver

with PWM current controller

■

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

■

Bipolar stepper motor

■

Dual or quad DC motor

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. 

         

         

D99IN1085A

GATE

LOGIC

OCD

A

OCD

B

OVER

CURRENT

DETECTION

OVER

CURRENT

DETECTION

GATE

LOGIC

VCP

VBOOT

EN

A

IN1

A

IN2

A

EN

B

IN1

B

IN2

B

VREF

A

V

BOOT

5V

10V

VS

A

V

S

B

OUT1

A

OUT2

A

OUT1

B

OUT2

B

SENSE

A

CHARGE

PUMP

VOLTAGE

REGULATOR

ONE SHOT

MONOSTABLE

MASKING

TIME

THERMAL

PROTECTION

V

BOOT

V

BOOT

10V

10V

BRIDGE A

SENSE

COMPARATOR

BRIDGE B

RC

A

+

-

SENSE

B

VREF

B

RC

B

PWM