Device description

L99UDL01

12/24

DB3264 Rev 3

The output configuration registers allow to identify which are the grouped outputs.

The output configuration registers also provide a range of current regulation levels and on-

time durations.

The command to actuate an output has three components (after the parallel links and

current regulation levels have been programmed) that comprise an actuation command.

These are direction (HS/LS), on-time and braking duration (ex. 300 ms on-time, 100 ms

braking time) and which side (HS/LS) is providing the current regulation. The unregulated

side is protected by the overcurrent protection.

All outputs, internal and external, are driven with active circuitry. Once an actuation cycle is

completed and all devices have been commanded off, the active circuitry is disabled after

~10 µs to reduce quiescent loading. All outputs are then in a passive off state that will keep

the outputs off (gates tied to their sources) in the face of noise on the load or supply.

2.4.1

Integrated Half Bridge Drivers (OUT1-OUT6)

Three outputs are configured as switching drivers incorporating active recirculation to

minimize power dissipation. The dead time between high and low side drivers is fixed within

the functionality of the output drivers.

Figure 4. OUT1-6 Block diagram

All integrated outputs can be driven in timed voltage control (PWM duty cycle), timed current

regulation control or on/off control.

These outputs have over current protection, under current detection, and off-state

diagnostics. Off state diagnostics may provide for non-active detection of Lock motor status.

The output rise and fall times are controlled to provide the lowest EMI while minimizing the

switching losses. This is done by controlling the edges to smooth out the corners of the

waveform while maintaining a fast transition from one level to the other.