DB3264 Rev 3

13/24

L99UDL01

Device description

22

2.4.2

Current regulation control

All integrated outputs can work in current regulation mode. Each power MOS has a

configurable bidirectional current sense which provides an image of the load current during

on mode and recirculation phase. This current image is compared to the target value written

in the configuration register in a digital algorithm so that the mean current value through the

load is equal to the chosen value.

Figure 5. Current control loop

The control loop for the current regulation is programmable. There are two parameters that

are adjustable through SPI. It should be noted that there is a default setting that will work for

the most of the lock motor applications known. These parameters are provided to aid in any

possible scenario. Typically, these parameters can be left alone:



Integral Gain, Ki, (3 bits)



Proportional Gain, Kp, (3 bits)

Integral and proportional gain settings are the standard control loop parameters for integral

This register is set up for a nominal control loop. Most, if not all, applications will be stable

enough to use this default setting.

Current regulation mode can be initiated via EN_OUT rising edge or via OUT_ON bit

(register 01H) provided EN_OUT=1 and OUTx_on =0 for the timed output x. Once started, a

timed actuation can be stopped only with EN_OUT=0, fault condition, Emergency mode or

at the natural end of timers. No other time controlled output can be started when a timed

actuation is ongoing.