AN2738 Datasheet, PDF (1/54 Pages) STMicroelectronics – L6390 half-bridge gate driver

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
V_{CC VCC 4}
+
FROM CONTROLLER
HIN 3
UV
DETECTION
BOOTSTRAP DRIVER
FLOATING STRUCTURE
from LVG
UV
DETECTION
LEVEL
S
SHIFTER
R
16 _BOOT
HVG
DRIVER
15
HVG
H.V.
Cboot
5V
FROM CONTROLLER
LIN 1
V_BIAS
FROM/TO
CONTROLLER
SD/OD 2
GND 8
TO ADC
DT 5
OPOUT ₇
LOGIC
SHOOT
THROUGH
PREVENTION
SMART
SD
SD
LATCH
DEAD
TIME
5V
COMPARATOR
+
-
VCC
OPAMP
+
-
14 OUT
V_{CC LVG}
DRIVER
LVG
11
10 CP+
+
V_REF
V_BIAS
9 OP+
OP-
6
TO LOAD
August 2009
Doc ID 14589 Rev 2
1/54
www.st.com