December 2009 Doc ID 14785 Rev 1 1/51
AN2785
Application note
L6393 half bridge gate driver
Introduction
The L6393 is a versatile high-voltage gate driver IC particularly suited to motor driving
applications. It simplifies the design of control systems for a wide range of motor
applications such as home appliances, industrial drives, DC motors and fans.
Developed using BCD offline technology, the device can operate with voltage rails up to
600 V. The gate driver provides all the functions and current capability necessary for
high-side and low-side power MOS and IGBT driving.
The L639x are high voltage half-bridge gate drivers. These devices can be used in all
applications where high voltage shifted control is necessary. The devices have a driver
current capability best suited for motor driving ratings and they are also equipped with
patented internal circuitry which replaces the external bootstrap diode. This feature is
achieved by means of a high-voltage DMOS synchronously driven with the low-side gate
driver.
The L6393 is an half-bridge driver with several functionalities such as externally adjustable
dead-time, shut-down function and an uncommitted comparator. The outputs can be driven
by a special logic input interface particularly suitable for phase/brake functions. The device
is available in DIP-14 or SO-14 packages.
Figure 1. L6393 application block diagram
UV
DETECTION
LEVEL
SH I F TER
BOOTSTRAP DRIVER
S
V
CC
LVG
DRIVER
V
CC
HVG
DRIVER
HVG
H.V.
TO LOAD
OUT
LVG
BOOT
Cb o o t
UV
DETECTION
+
-
GND
CPOUT
R
LOGIC
SH O O T
THROUGH
PREV EN T I O N
FLOATING STRUCTURE
COMPARATOR
CP+
5V
10
12
13
14
7
8
4
9
6
CP-
SD
2
DT
DEAD
TIME
5
from LVG
BRAKE
PHASE
1
3
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