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August 2009 Doc ID 14589 Rev 2 1/54
AN2738
Application note
L6390 half-bridge gate driver
Introduction
The L6390 is a versatile high voltage gate driver IC which is particularly suited for field
oriented control (FOC) 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.
Designed using BCD off-line technology, this device is capable of operating 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 MOSFET and IGBT driving.
The L639x series 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 home appliance 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 L6390 is a half-bridge driver with several functions such as externally adjustable dead-
time, interlocking, smart shutdown (patented), fault comparator and a dedicated high
performance op-amp for advanced current sensing. The outputs can be driven by two
dedicated logic signals or, alternatively, only one logic signal by connecting the two inputs
together. The device is available in the DIP16 or SO16 packages.
Figure 1. L6390 application block diagram
UV
DETECTION
LEVEL
SHIFTER
BOOTSTRAP DRIVER
S
V
CC
LVG
DRIVER
V
CC
HIN
LIN
HVG
DRIVER
HVG
H.V.
TO LOAD
OUT
LVG
BOOT
Cboot
UV
DETECTION
+
-
OP+
OP-
GND
OPOUT
SD/OD
DT
OPAMP
DEAD
TIME
R
LOGIC
SHOOT
THROUGH
PREVENTION
FLOATING STRUCTURE
+
-
COMPARATOR
+
V
REF
CP+
SD
LATCH
5V
1
2
11
14
15
16
7
5
8
3
4
10
9
6
SMART
SD
from LVG
+
FROM CONTROLLER
FROM CONTROLLER
FROM/TO
CONTROLLER
TO ADC
V
BIAS
V
BIAS
VCC
VCC
5V
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