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L6747A Datasheet(PDF) 11 Page - STMicroelectronics

Part # L6747A
Description  High current MOSFET driver
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6747A Datasheet(HTML) 11 Page - STMicroelectronics

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L6747A
Device description and operation
Doc ID 17126 Rev 1
11/15
Referring to Figure 6, a classic MOSFET driver can be represented by a push-pull output
stage with two different MOSFETs: a P-MOSFET to drive the external gate high, and an 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 capacitor 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 follows:
The total power dissipated from the driver can then be determined as follows:
Figure 6.
Equivalent circuit for a MOSFET driver
4.5
Layout guidelines
The L6747A provides driving capability to implement high-current step-down DC-DC
converters.
The first priority when placing components for these applications should be given to the
power section, minimizing the length of each connection and loop as much as possible. To
minimize noise and voltage spikes (as well as EMI and losses) power connections must be
part of a power plane, and in any case constructed with wide and thick copper traces. The
loop must be minimized. The critical components, such as the power MOSFETs, must be
close to each other. However, some space between the power MOSFETs is required to
assure good thermal cooling and airflow.
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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