6
Data Device Corporation
www.ddc-web.com
BU-65178/65179*/61688*/61689*
F1 web-09/02-0
TRANSFORMERS
In selecting isolation transformers to be used with the Mini-ACE,
there is a limitation on the maximum amount of leakage induc-
tance. If this limit is exceeded, the transmitter rise and fall times
may increase, possibly causing the bus amplitude to fall below
the minimum level required by MIL-STD-1553. In addition, an
excessive leakage imbalance may result in a transformer dynam-
ic offset that exceeds 1553 specifications.
The maximum allowable leakage inductance is 6.0 H, and
is measured as follows:
The
side
of
the
transformer
that
connects
to
the
Mini-ACE is defined as the “primary” winding. If one side of the
primary is shorted to the primary center-tap, the inductance
should be measured across the “secondary” (stub side) winding.
This inductance must be less than 6.0 H. Similarly, if the other
side of the primary is shorted to the primary center-tap, the
inductance measured across the “secondary” (stub side) wind-
ing must also be less than 6.0 H.
The difference between these two measurements is the
“differential” leakage inductance. This value must be less than
1.0 H.
Beta Transformer Technology Corporation (BTTC), a subsidiary
of DDC, manufactures transformers in a variety of mechanical
configurations with the required turns ratios of 1:2.5 direct cou-
pled, and 1:1.79 transformer coupled. TABLE 3 provides a listing
of many of these transformers.
For further information, contact BTTC at 631-244-7393 or at
www.bttc-beta.com.
DLP-7014
SLP-8007
SLP-8024
NOT RECOMMENDED
LPB-5015
B-3310
HLP-6015
Dual epoxy transformer, side by side, surface mount, 0.930" X 0.630", 0.155" max height
DLP-7115 (see note1)
Dual epoxy transformer, side by side, surface mount, 1.410" X 0.750", 0.130" max height
Single metal transformer, hermetically sealed, surface mount, 0.630" X 0.630", 0.175" max height
B-3261
HLP-6014
Dual epoxy transformer, side by side, flat pack, 0.930" X 0.630", 0.155" max height
Single metal transformer, hermetically sealed, flat pack, 0.630" X 0.630", 0.175" max height
B-3300
Dual epoxy transformer, side by side, through-hole, 0.930" X 0.630", 0.155" max height
TST-9027
Dual epoxy transformer, twin stacked, flat pack, 0.625" X 0.625", 0.280" max height
TST-9017
Dual epoxy transformer, twin stacked, surface mount, 0.625" X 0.625", 0.280" max height
TST-9007
B-3819
LPB-5014
Single epoxy transformer, surface mount, hi-temp solder, 0.625" X 0.625", 0.220" max height.
Single epoxy transformer, flat pack, 0.625" X 0.625", 0.150" max height
B-3227
Single epoxy transformer, surface mount, 0.625" X 0.625", 0.275" max height
B-3231
Single epoxy transformer, flat pack, 0.625" X 0.625", 0.275" max height
B-3818
B-3067
B-3226
Single epoxy transformer, through-hole, 0.625" X 0.625", 0.220" max height.
Single epoxy transformer, through-hole, 0.625" X 0.625", 0.250" max height
BTTC PART NO.
TRANSFORMER CONFIGURATION
Single epoxy transformer, surface mount, 0.625" X 0.625", 0.150" max height
B-3229
Single epoxy transformer, through hole, transformer coupled only, 0.500" X 0.350", 0.250" max height
TABLE 3. BTTC TRANSFORMERS FOR USE WITH MINI-ACE
Notes:
1. DLP-7115 operates to +105°C max. All other transformers listed operate to +130°C max.