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AN2785 Datasheet(PDF) 16 Page - STMicroelectronics

Part # AN2785
Description  L6393 half bridge gate driver
PDF  51 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2785 Datasheet(HTML) 16 Page - STMicroelectronics

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Application examples
AN2785
16/51
Doc ID 14785 Rev 1
In the application circuit shown in Figure 10, the fan rotor position information is provided by
the Hall sensor (with logic output) through a logic signal having the same frequency and the
same phase of the rotor. This signal can be used to select which diagonal of the full-bridge
must be turned ON starting from a certain rotor position. In fact, the targeted fan motor is a
typical single-phase BLDC motor that requires synchronous driving with the rotor position.
This operation is very simply implemented with the L6393 IC gate driver thanks to its logic
signal management: the PHASE signal is in phase with the high-side output and in
opposition of phase with the low-side output. This means that in order to turn ON a certain
full-bridge diagonal the hall sensor signal can be directly fed to the PHASE input of one
L6393 and the inverted signal to the PHASE input of the other L6393.
Figure 10.
Application circuit for current mode FAN controller using two L6393
drivers
+5V
+5V
Rotation Detection
+5V
+12 ÷ 600V
RD
+12V
+12V
Over Current
Disable Time
+5V
H
FG
Dead Time
Setting
Dead Time
Setting
Vth
+12V
SD
VCC
CP-
CP+
SD
GND
VBOOT
HVG
OUT
LVG
DT
CPOUT
L6393
VCC
CP-
CP+
SD
GND
VBOOT
HVG
OUT
LVG
DT
CPOUT
L6393
Logic Output
HALL Sensor
PHASE
BRAKE
PHASE
BRAKE
PHASE
BRAKE
SD
HVG
LVG
PHASE
BRAKE
SD
HVG
LVG
+
_
Vth
Torque Input
with minimum
threshold limiter
+5V
PWM Current Control
OFF Time
COMPARATOR
+12V
+5V
H
Logic Output
HALL Sensor
+
_
+5V
COMPARATOR
+5V
Logic + Drivers
BRAKE
PHASE
PHASE
Signal Inverter
Logic + Drivers
Full Bridge Power Stage
Motor Load
Rotation Detection
RD
FG
Vbus
Torque Input
with minimum
threshold limiter
EQUIVALENT CIRCUIT USING L6393 DRIIVERS
SD
SD



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