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AN1762
APPLICATION NOTE
December 2003
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.
D99IN1091A
GATE
LOGIC
OVER
CURRENT
DETECTION
OVER
CURRENT
DETECTION
GATE
LOGIC
VCP
VBOOT
EN
A
IN1
A
IN2
A
EN
B
IN1
B
IN2
B
V
BOOT
5V
10V
VS
A
V
S
B
OUT1
A
OUT2
A
OUT1
B
OUT2
B
SENSE
A
CHARGE
PUMP
VOLTAGE
REGULATOR
THERMAL
PROTECTION
V
BOOT
V
BOOT
10V 10V
BRIDGE A
BRIDGE B
SENSE
B
OCD
A
OCD
B
by Vincenzo Marano
L6205, L6206, L6207 DUAL FULL BRIDGE DRIVERS
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.
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