DB3264 Rev 3

15/24

L99UDL01

Device description

22

2.4.8

EN_OUT

The output Enable pin has three states: It enables the output functionality while held high,

and disables the outputs when held low. This pin can also be used to initiate an output

actuation, based on programmed parameters, on a rising edge. There is a filter time on the

timed actuation.

2.4.9

Paralleling Outputs

Up to three the integrated outputs can be paralleled in two groups for the purpose of sharing

higher current loads.

Some of the possible combinations:



2 groups of 3



2 groups of 2 and 2 single outputs



1 group of 2, 1 group of 3 and a single output



1 group of 3, and 3 single outputs



1 group of 2, and 4 single outputs



6 single outputs, no groups

Paralleled outputs have all of their current regulation, protection, and diagnostic information

tied together. Once a set of outputs has been grouped the master registers are used to

command and diagnose that group. The master registers are output 1 for outputs 1 through

3 and output 4 for outputs 4 through 6.

When paralleling multiple half bridges all the channels in the group will provide the current

monitoring for the master current regulation loop.

Current values programmed for each channel in the group are added to create the total

current for the group. Each output can have different values (for ex; 1 A for ch1 and 1.2 A for

ch2 to generate 2.2 A total current regulation for the group). The Slave outputs must be

programmed as current regulating when using current regulation.

PWM values will be taken from the master registers only. The remaining slave registers will

be ignored when in PWM mode. The Slave outputs must be programmed as PWM when

using PWM mode.

All diagnostics in a group must be cleared prior to restarting that group.

2.5

Operating modes

We can distinguish between 4 different operating modes: Normal mode, Standby mode,

Sleep mode and Emergency override mode. The L99UDL01 powers up in Standby mode by

default.