AN1762 Datasheet, PDF (1/53 Pages) STMicroelectronics – APPLICATION NOTE

AN1762
APPLICATION NOTE
L6205, L6206, L6207 DUAL FULL BRIDGE DRIVERS
by Vincenzo Marano
Modern motion control applications need more flexibility that can be addressed only with specialized IC
products. The L6205, L6206, L6207 are dual full bridge drivers ICs specifically developed to drive a wide
range of motors. These ICs are one-chip cost effective solutions that include several unique circuit design
features. These features allow the devices to be used in many applications including DC and stepper motor
driving. The principal aim of this development project was to produce easy to use, fully protected power ICs.
In addition several key functions such as protection circuit and PWM current control drastically reduce exter-
nal components count to meet requirements for many different applications.
1 INTRODUCTION
The L6205, L6206, L6207 are highly integrated, mixed-signal power ICs that allow the user to easily design a
control system for two-phase bipolar stepper motors, multiple DC motors and a wide range of inductive loads.
Figure 1 to Figure 3 show the L6205, L6206, L6207 block diagrams. Each IC integrates eight Power DMOS plus
other added features for safe operation and flexibility. The L6207 also features a constant t_OFF PWM current
control technique (Synchronous mode) for each of the two full bridges.
Figure 1. L6205 block diagram.
VBOOT
VCP
V_BOOT
CHARGE
PUMP
OCD_A
EN_A
IN1_A
IN2_A
THERMAL
PROTECTION
VOLTAGE
10V
REGULATOR
5V
EN_B
IN1_B
IN2_B
OCD_B
OVER
CURRENT
DETECTION
GATE
LOGIC
OVER
CURRENT
DETECTION
GATE
LOGIC
V_BOOT
10V
V_BOOT
VS_A
OUT1_A
OUT2_A
10V
SENSE_A
BRIDGE A
BRIDGE B
D99IN1091A
VS_B
OUT1_B
OUT2_B
SENSE_B
December 2003
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