L6482
Functional description
Doc ID 023768 Rev 1
31/73
switch input events do not cause interrupts and the switch status information is at the user’s
disposal (
,
).
The switch input can be used by GoUntil and ReleaseSW commands as described in
If the SW input is not used, it should be connected to V
DD
.
6.15
Programmable gate drivers
The L6482 integrates eight programmable gate drivers that allow the fitting of a wide range
of applications.
The following parameters can be adjusted:
●
gate sink/source current (I
GATE
)
●
controlled current time (t
CC
)
●
turn-off overboost time (t
OB
).
During turn-on, the gate driver charges the gate forcing an I
GATE
current for all the controlled
current time period. At the end of the controlled current phase the gate of the external
MOSFET should be completely charged, otherwise the gate driving circuitry continues to
charge it using a holding current.
This current is equal to I
GATE
for the low-side gate drivers and 1 mA for the high-side ones.
During turn-off, the gate driver discharges the gate sinking an I
GATE
current for all the
controlled current time period. At the beginning of turn-off an overboost phase can be
added: in this case the gate driver sinks an I
OB
current for the programmed t
OB
period in
order to rapidly reach the plateau region. At the end of the controlled current time the gate of
the external MOSFET should be completely charged, otherwise the gate driving circuitry
discharges it using the integrated Miller clamp.
Figure 14.
External switch connection
AM15044v1
External
Switch
SW
V
DD
