Kontron MARS Smart Battery Kit - Manual (Page 18)

MARS User´s Guide
6.1.3 Feed-in with 5V up to 28V
This feature offers the widest spectrum of possible input voltages, because almost all common
supply voltages are in this area of 5V to 28V. The power source can be connected to connector X3.
This configuration for the buck-boost converter (connection to connector X3) can be used, when a
suitable power jumper on R80 is populated and the jumper R79 and R211 are not connected.
You can use as a power jumpter e.g. an LRZ1206 from TT electronics.
6.1.4 Activation and Deactivation of the Converter
There is the possiblity to deactivate and active the input buck-boost converter, to allow certain test
and controle scenarious.
Jumpter J2 can be swithed to ON and OFF to use this function.
6.2 Cases where no Input Buck-Boost Converter is necessary
6.2.1 Basic Conditions
There are two cases in which the input buck-boost converter is not necessary.
The first is, if only voltages between 19V and 28V are connected at the input.
The other possible case is, when batteries are used, which voltages don’t exceed a defined range.
It must be ensured, that the input voltage is always sufficiently higher than this voltage range.
In these cases the input buck-boost converter can be omitted or bypassed.
In all other cases, the input buck-boost converter is necessary.
6.2.2 How to bypasse the converter
h Setting the bypass Æ alter Power Jumper from R77 to R78
h Don’t use R80, R211 and R79. Additionally the whole circuit of the input buck-boost
converter can be omitted.
h Set DCIN_GD to „always true“ Æ alter R20 to R17 (both bottom side)
If there are only batteries which need a lower charging voltage than 19V the input buck-boost
converter can be omitted like it is described above.
The output voltage of the input converter can be changed, if the batteries allow this and the input
Note: voltage would be not high enough. The voltage devider (R18||R142 + R153||R22) controls this output
voltage according to the formula:
) 1 ( V 8 , 0 V
22 R || 153 R
142 R || 18 R
BBin _ out
+ ⋅ =
Input Buck-Boost Converter
17