Anyone familiar with this driver? I fixed the driver but it’s flashing about every 5 seconds.
One of low voltage warning is main LEDs blinks
From the manual :
How (and how often) the circuit reports the low and medium voltage conditions is configured using this
Menu option.
The circuit reports the low voltage condition via the STAT pin on the PCB. STAT will drive high (~3.3V) to
light the status LED and drive back to 0V to turn the status LED off. The STAT pin can drive a single 3mm
or 5mm (at approximately 20 mA). If this feature is used, wire the 3mm or 5mm LED between STAT and
GND. A red or amber LED is recommended for this use.
Note: The STAT pin will light the status LED (if affixed) if the input voltage is greater than the V Low
Setting but less than the V Med Setting. The STAT pin will pulse (flash the status LED) once per second
when the input voltage is less than the V Low Setting. The STAT pin will double pulse (flash the status
LED) once per second if the input voltage is less than the V Cut Off Setting.
The STAT pin is pulsed once every time the light is turned on as a self-check that the status LED is
functioning correctly.
If the user does not want to wire a status LED to the STAT pin but still wants an indication of low voltage
occurring, then the main LED can be set to flash at a specific interval to give a visual warning. How the
main LED flashes is dependent on whether the light is in constant or strobe mode.
Constant Mode: If the input voltage is greater than the V Low Setting but less than the V Med Setting, the
main LED will briefly flash off once at the flash rate chosen with this Menu option (5 sec, 10 sec, 30 sec or
60 sec).This warning will time out after five sequences so the remaining battery capacity can be used
without annoyance. As a reminder, the V Med warning sequence will repeat if the light is turned off/on, or
if a higher level is chosen. The STAT pin will remain active with no timeout. If the input voltage is less
than the Low Setting the main LED will flash off twice at the flash rate. This V Low warning sequence will
continue until the Cut Off Setting is reached or recharged to above the V Med Setting. If the input voltage
is less than the Cut Off Setting the main LED will flash off three times at the flash rate. This Cut Off
warning sequence will continue until the light turns off (Cut Off enabled) or indefinitely (Warn Only
enabled), see Sec 0. These sequences were chosen to give an obvious indication of battery status while
still allowing use of the light for navigation.
Strobe Mode: The warning sequence follows the same one, two or three flash report (for medium, low or
cutoff warning) as for the Constant mode above. At the user specified flash rate, the light will stop the
strobe sequence for 1.5 seconds and stay steady at the High level (as per the current strobe sequence)
and then it will flash to the Low level (as per the current strobe sequence) one, two or three times and
then it will stay steady at the High level for 1.5 seconds. The light will then resume the strobe sequence
until the next warning cycle specified by the flash rate occurs.
Threshold/Hysteresis Selection: The voltage monitoring/warning system uses hysteresis to prevent the
warning system triggering and resetting again when hovering around a trip point.
For example, if the medium warning is set to 14.3V the voltage warning will trip when the input voltage
drops below 14.3V. The voltage is required to go at least 14.3 + Hysteresis to reset the medium warning.
By default the hysteresis is set to 0.2V which for this example means the voltage would need to rise
above 14.5V to reset the medium level. The 0.2V hysteresis works well for most applications, but if the
battery pack is also being used to power other devices that may have large cycle current draws (like a
high power flashing LED system) the input voltage to the driver may fluctuate enough to trip and reset the
voltage monitoring over and over again. Increasing the hysteresis to 0.4V or 0.6V can prevent this
warning cycle.
Configuring the settings:
Initially the LED will be Dim to indicate that one flash per 5 seconds will be chosen. See the table below
for all available settings.
• 0 click (dim) → Main LED flash once per 5 sec (undervoltage)
• 1 click (brighter) → Main LED flash once per 10 sec (undervoltage)
• 2 click (brighter) → Main LED flash once per 30 sec (undervoltage)
• 3 click (brighter) → Main LED flash once per 60 sec (undervoltage)
• 4 click (off) → No Main LED flash for undervoltage - default
When you are satisfied with the choice, press to save the setting. The LED will flash once and go dim
again and wait for entry of the threshold/hysteresis value.
• 0 click (dim) → Hysteresis set to 0.2V - default
• 1 click (brighter) → Hysteresis set to 0.4V
• 2 click (brighter) → Hysteresis set to 0.6V
When you are satisfied with the choice, press to save the setting. The LED will flash twice and go dim to
indicate that the selection has been made, and that the Menu mode has been reentered.
Note: regardless of the selection for this Menu, the STAT pin will always report the battery status.