DocID14497 Rev 5 5/19
L6393 Truth table
19
3 Truth table
In the L6393 IC the two input signals PHASE and BRAKE are fed into an AND logic port and
the resulting signal is in phase with the high-side output HVG and in opposition of phase
with the low-side output LVG. This means that if BRAKE
is kept to a high level, the PHASE
signal drives the half bridge in phase with the HVG output and in opposition of phase with
the LVG output. If BRAKE
is set to a low level, the low-side output LVG is always ON and
the high-side output HVG is always OFF, whatever the PHASE signal. This kind of logic
interface provides the possibility to control the power stages using the PHASE signal to
select the current direction in the bridge and the BRAKE
signal to perform current slow
decay on the low-sides.
From the point of view of the logic operations the two signals PHASE and BRAKE
are
completely equivalent, that means the two signals can be exchanged without any change in
the behavior on the resulting output signals (see Figure 1).
Note: The deadtime between the turn-OFF of one power switch and the turn-ON of the other
power switch is defined by the resistor connected between the DT pin and the ground.
Table 2. Truth table
Inputs Outputs
SD
PHASE BRAKE LVG HVG
L X
(1)
1. X: don’t care.
X
(1)
L L
H L L H L
H L H H L
H H L H L
H H H L H
