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AN2785 Datasheet(PDF) 19 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) 19 Page - STMicroelectronics

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AN2785
Application examples
Doc ID 14785 Rev 1
19/51
Figure 12.
L6393 application circuit for voltage mode FAN controller (logic output
hall sensor)
The same circuit for rotation detection as the one shown in Figure 11 can be used in this
case.
6.2.3
Voltage mode - example 2
Figure 13
provides another application of the L6393. As in the previous example, the control
type is voltage mode, but the main difference is that the Hall Sensor has an analog
differential linear output and it must be converted into a digital signal to be fed into the gate
drivers’ input logic. The conversion is provided by one comparator belonging to one of the
two L6393s in the application. The other L6393 comparator is used to implement an over-
current protection, similarly to the circuit shown in Figure 12. The remaining circuitry is
similar to the previous example. In this particular case, for higher accuracy, the circuitry
providing the minimum speed value is implemented using an op-amp in an ideal rectifier
configuration.
+5V
+5V
Rotation Detection
+5V
+12 ÷ 600V
RD
+12V
+12V
Vlim
Over Current
Disable Time
+5V
H
FG
Dead Time
Setting
Dead Time
Setting
Vth
Simplified Minimum
Speed Generation
+12V
Logic Output
HALL Sensor
VCC
CP-
CP+
SD
GND
VBOOT
HVG
OUT
LVG
DT
CPOUT
L6393
VCC
CP-
CP+
SD
GND
VBOOT
HVG
OUT
LVG
DT
CPOUT
L6393
PHASE
BRAKE
SD
HVG
LVG
PHASE
BRAKE
SD
HVG
LVG
+
_
+5V
COMPARATOR
+5V
H
Logic Output
HALL Sensor
BIPOLAR
TRANSISTOR
Logic + Drivers
PHASE
PHASE
Signal Inverter
Logic + Drivers
Full Bridge Power Stage
Motor Load
Rotation Detection
RD
FG
Vbus
EQUIVALENT CIRCUIT USING L6393 DRIIVERS
SD
SD
+5V
+12V
Triangle Generator
Over Current
Protection
Vlim
Vth
+12V
SpeedInput
with minimum
threshold limiter
+
_
+5V
COMPARATOR
PWM Comparator
SD
SD
PHASE
PHASE
BRAKE
PHASE
BRAKE
+12V
Triangle Generator



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