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Firmware version 1.10 - Document version 1.06 - eng
LTDVE1CH-40F | INSTRUCTIONS MANUAL
•
When 0x0 the DC/DC converter is in the fixed voltage mode (default)
•
When 0x1 the DC/DC converted is in the autodetect voltage mode
The factory value for this register is zero, therefore by default the DC/DC converter operates in the
fixed voltage mode.
Notes:
•
The automatic voltage sensing process is actually triggered by either writing register
BOARD_COMMAND
with value 4 (see section
14.2.66. Register BOARD_COMMAND
or by
pressing the
Apply
button in the
Converter settings
section in the
Light outputs
web page
(see section
14.3.1. Main page and navigation menu
)
•
The automatic voltage sensing process works by flashing the light for 100 µs. This switch-on
time is intentionally short in order not to risk damage to the light. If a longer turn-on time is
required in the final application, the output voltage of the DC/DC converter may need to be
increased of some amount. Should this be the case, refer to the light current and voltage
measurements collected in the
MEASURED_CURRENT
[x] and
MEASURED_VOLTAGE
[x]
registers or to the data shown in the
Main
web page
14.2.57. Register CONVERTER_MAXIMUM_VOLTAGE
The internal DC/DC converter can either operate in two modes: fixed voltage mode and autodetect
voltage mode.
In the fixed voltage mode, the output voltage of the DC/DC converter is simply set to the value
programmed in the
CONVERTER_MAXIMUM_VOLTAGE
register regardless of the actual voltages
developed on the light output when it is driven at the programmed current. The
CONVERTER_PRESET_VOLTAGE
register is overwritten with the same voltage value.
In the autodetect voltage mode, the output voltage of the DC/DC converter is gradually increased
from zero to the value programmed in the
CONVERTER_MAXIMUM_VOLTAGE
register. At each
step the light is flashed for 100 µs while the actual current is measured and evaluated. This process
is stopped as soon as the programmed current is produced in the light. At the end of the process,
the
two
converter
controlling
registers
CONVERTER_MAXIMUM_VOLTAGE
and
CONVERTER_PRESET_VOLTAGE
are overwritten with the final voltage value reached on the
DC/DC converter.
Allowed values for this register are in the range from 0 to 200 and are expressed in volts, so the
theoretical maximum DC/DC converter output voltage would range from zero up to 200 V. However,
the actual minimum is around 5 V and the actual maximum is about 190 V.
The factory value for this register is 30, therefore by default the maximum voltage produced by the
DC/DC converter is 30 V.
Avoid operation with non-allowed values.
14.2.58. Register CONVERTER_PRESET_VOLTAGE
The internal DC/DC converter can either operate in two modes: fixed voltage mode and autodetect
voltage mode. The actual operating mode is selected by this register.
In the fixed voltage mode, the output voltage of the DC/DC converter is simply set to the value
programmed in the
CONVERTER_MAXIMUM_VOLTAGE
register regardless of the actual voltages
developed on the light output when it is driven at the programmed current. The
CONVERTER_PRESET_VOLTAGE
register is overwritten with the same voltage value.
In the autodetect voltage mode, the output voltage of the DC/DC converter is gradually increased
from zero to the value programmed in the
CONVERTER_MAXIMUM_VOLTAGE
register. At each
step the light is flashed for 100 µs while the actual current is measured and evaluated. This process
is stopped as soon as the programmed current is produced in the light. At the end of the process,
