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L6743QTR Datasheet(PDF) 10 Page - STMicroelectronics

Part # L6743QTR
Description  High current MOSFET driver
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6743QTR Datasheet(HTML) 10 Page - STMicroelectronics

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Device description and operation
L6743, L6743Q
10/17
When designing an application based on L6743, L6743Q it is recommended to take into
consideration the effect of external gate resistors on the power dissipated by the driver.
External gate resistors helps the device to dissipate the switching power since the same
power PSW will be shared between the internal driver impedance and the external resistor
resulting in a general cooling of the device.
Referring to Figure 6, classical MOSFET driver can be represented by a push-pull output
stage with two different MOSFETs: P-MOSFET to drive the external gate high and N-
MOSFET to drive the external gate low (with their own RDS(on): Rhi_HS, Rlo_HS, Rhi_LS,
Rlo_LS). The external power MOSFET can be represented in this case as a capacitance
(CG_HS, CG_LS) that stores the gate-charge (QG_HS, QG_LS) required by the external power
MOSFET to reach the driving voltage (PVCC for HS and VCC for LS). This capacitance is
charged and discharged at the driver switching frequency FSW.
The total power Psw is dissipated among the resistive components distributed along the
driving path. According to the external gate resistance and the power-MOSFET intrinsic
gate resistance, the driver dissipates only a portion of Psw as follow:
The total power dissipated from the driver can then be determined as follow:
Figure 6.
Equivalent circuit for MOSFET drive
P
SW
HS
1
2
--- C
GHS
PVCC
2
Fsw
R
hiHS
R
hiHS
R
GateHS
R
iHS
++
----------------------------------------------------------------
R
loHS
R
loHS
R
GateHS
R
iHS
++
----------------------------------------------------------------
+
⎝⎠
⎛⎞
⋅⋅
=
P
SW
LS
1
2
--- C
GLS
VCC
2
Fsw
R
hiLS
R
hiLS
R
GateLS
R
iLS
++
--------------------------------------------------------------
R
loLS
R
loLS
R
GateLS
R
iLS
++
--------------------------------------------------------------
+
⎝⎠
⎛⎞
⋅⋅
=
PP
DC
P
SW
HS
P
SW
LS
++
=
RGATELS
RILS
CGLS
VCC
LS DRIVER
LS MOSFET
GND
LGATE
RGATEHS
RIHS
CGHS
BOOT
HS DRIVER
HS MOSFET
PHASE
HGATE
VCC


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