Kontron 820155 DC-DC User Manual
Page 6
820155 DC-DC Supply 10-32Vin 90W
KTD-00740-C
Public User Manual
Date: 2008-04-24 Page
6 of 9
Jumpers (J10)
By use of up to 3 Jumpers it is possible to select between 8 microcontroller driven timing modes. The default
mode is no Jumpers installed in the J10 connector, position A, B, C and D. This mode is the standard ATX
Supply mode.
In default mode the PSU behave as a traditional PC PSU with no ignition control (shutdown controller
bypassed) and it can be used in non-vehicle computer applications. The other modes are for battery driven
applications having different Off delay and +5VSB Off delay timings according to the following table.
Mode A B C D Off
Delay 5VSB
Off
Delay Notes
0
: : : :
0 sec
Forever
Standard ATX supply (Default)
1
: : :
5 sec
45 sec
Battery Driven Application Mode
2
:
: : 5 sec
2 hours
Battery Driven Application Mode
3
: : 5 sec
Forever (*)
Battery Driven Application Mode
4
: : : 30 sec
2 hours
Battery Driven Application Mode
5
: : 30 sec
Forever (*)
Battery Driven Application Mode
6
:
: 30 min
Forever (*)
Battery Driven Application Mode
7
: 3 hours
Forever (*)
Battery Driven Application Mode
(*) This mode can drain the battery even though the PSU will automatically shut down when battery voltage is
below 11.2V for more than 1 minute.
Switch (J8 and J9)
J8 and J9 are parallel connectors used to simulate a “Power On Button” signal.
These outputs can be left unconnected when the PSU is used in standard ATX Supply Mode (no Jumpers
installed in J10). In stead the Motherboard Power On Button is implemented by separate push button contact
in combination with BIOS settings for the Power Button input. In this configuration it is possible also to keep
the Motherboard in Shutdown mode after power interruption.
If one of these outputs is connected to the Motherboard “Power On Button” input (Front Panel connector)
when the PSU is used in standard ATX Supply Mode (no Jumpers installed in J10), then the PSU will
automatically turn on the Motherboard after power interruption. This is one way of implement an “Always On”
function.
The output can be used in Battery Driven Application Mode (1 – 3 jumpers installed in J10) in order to start up
motherboard automatically when power is connected to the PSU and SW turns to on for the first time. One of
these outputs shall be connected to the Motherboard “Power On Button” input (Front Panel connector). The
output will also be used to initiate shutdown procedure to save battery capacity. It is possible to add manual
operated push button to one of connectors (J8 or J9).
Note: In case “Always On” function shall not allow Shut Down then a special circuit can be design to fit the
Frontpanel connector of the Motherboard. Application note is available on request.
Signal
Pin
Signal
Position A
1 2
Gnd
Position B
3 4
Gnd
Position C
5 6
Gnd
Position D
7 8
Gnd
Pin
Signal
1
Switch pin1
2
Switch pin2