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07/2020
Corona II
– LED Line Scan Illumination
PMA_CHR_CD40069_R05_Manual_Corona-II_XLC4
112
The base currents
)
(
channel
I
default
are read from
cuPar
.
DefaultCurrent[0..3]
The following limits are valid for T and t
P
Item
Description
Min.
Nom.
Max.
Unit
t
P
pulse width (high)
10
100
[µs]
T
pulse period
20
250
[µs]
Additional condition: t
P
>=0.1 x T
Errors are signaled by status LEDs and output signal FAIL.
6.5.3.4 Analog-controlled mode
Parameter
Value
cuPar
.
WorkingMode
3
In this mode, the output currents of the four LED channels are set by the external input control
voltage ACTRL.
The current range of the output channels is mapped to an input voltage range of ACTRL
from 0V to 10V. The output currents of the 4 channels are directly proportional to the voltage
ACTRL.
OfType
MaxCurrent
V
ACTRL
mA
I
CHANNEL
=
10
]
[
]
[
If the level of ACTRL oversteps 10V, each current is limited to the maximum allowed channel
current (
MaxCurrentOfType
).
If the LEDs are off, ACTRL must be higher than
10
OfType
MaxCurrent
OfType
MinCurrent
to switch the LEDs on. This inhibits the controller to generate lower current levels than the
lower limit
MinCurrentOfType
If the LEDs are on, and the level of ACTRL falls
under the “switch on level”, the current is
limited to
MinCurrentOfType
until ACTRL falls under the switch on level minus 0.5 V.
If ACTRL underruns this limit, the LEDs are switched off.
Figure 6-15:
Channel current as a function of ACTRL-Voltage. (
switch on
/
switch off
)