Board Mountable
DC-DC Converters
IMX/IMY 15 Series
Description of Options
Table 18: Survey of options
Option
Function of option
Characteristic
–8
R
G
K
i
Extended operational ambient temperature range
Input and magnetic feedback
Synchronous rectification
Alternativ pinout
TA = –40...85°C
Inhibit
C
L
C-pinout
Surface mount version with PCB lid
Open frame
Z
Option -8
Option K
Extended Temperature Range
Alternative Pinout
Extension of the temperature range from standard
–40...85°C. In the upper temperature range the output
power derating below should be observed. The modules
will provide the specified output power with free air convec-
tion cooling.
Option K configures the electrically isolated double outputs
to the alternative pinout with outputs connected in series
(Vo+/Go/Vo–) and common ground.
However instead of using units with option K, it is recom-
mended to use the standard double output units by provid-
ing the printed circuit board with an additional pin hole (for
pin 12 of double output units) connected to pin hole 13. This
will provide more design-in flexibility since by that both
pinouts may be used on the same PCB.
Po/Po max
11047
1.2
1.0
0.8
0.6
Option i
Inhibit
Excludes shut down and option K.
The output(s) of the converter may be enabled or disabled
by means of a logic signal (TTL, CMOS, etc.) applied to the
inhibit pin. No output voltage overshoot will occur when the
unit is turned on. If the inhibit function is not required the
inhibit pin should be connected to Vi– to enable the output
(active low logic, fail safe).
0.4
0.2
0
–40
TA [°C]
–20
0
80
20
40
60
Fig. 33
Converter operating:
Converter inhibited
or open inhibit pin:
–10 V...0.8 V
Maximum allowed output power versus ambient tempera-
ture.
2.4 V...Ui max
06070
Option R
R Input and Magnetic Feedback
Vi+
R specifies magnetic feedback from the output for closer
regulation of the output voltages of double output and sin-
gle output synchronous rectification units. It is especially
suited for applications where the two outputs are either
connected in parallel or in series to form one strong and
tight regulated output. It enables the adjustment of the out-
put voltages via the R-input on the secondary side by an
external resistor or an external voltage source in the range
of approximative 80...105% of Uo nom. Option R excludes
the Trim input (see also table: Pin allocation), option K as
well as the possibility to operate several converters with the
outputs connected in parallel.
i
Vi–
Fig. 34
If the inhibit is not used the inhibit pin should be con-
nected to Vi–
Edition 7/5.2000
20/20