10
Data Device Corporation
www.ddc-web.com
BU-65178/65179*/61688*/61689*
V-1/13-0
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 µH, 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 µH. 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 µH.
The difference between these two measurements is the
“differential” leakage inductance. This value must be less than
1.0 µH.
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.
Notes:
1. All Transformers in the table above can be used with BU-6XXXXX3/6 (1553B transceivers).
2. Transformers identified with "#" in the table above are not recommended for use with the BU-6XXXXX4 (McAir-Compatable transceivers)
TABLE 3. BTTC TRANSFORMERS FOR USE WITH Mini-ACE
BTTC PART
NUMBER
# OF CHANNELS,
CONFIGURATION
COUPLING RATIO
DESCRIPTION
COUPLING
RATIO (1:X) MOUNTING MAX HEIGHT
WIDTH
(INCLUDING
LEADS)
LENGTH
(INCLUDING
LEADS)
MLP-2005 Single Direct (1:2.5) SMT 0.185" 0.4" 0.52"
MLP-3005 Single Direct (1:2.5) Through Hole 0.185" 0.4" 0.4"
B-3230 (-30) # Single Direct (1:2.5) Through Hole 0.25" 0.35" 0.5"
MLP-2205 Single Transformer (1:1.79) SMT 0.185" 0.4" 0.52"
MLP-3205 Single Transformer (1:1.79) Through Hole 0.185" 0.4" 0.4"
B-3229 (-29) # Single Transformer (1:1.79) Through Hole 0.25" 0.35" 0.5"
HLP-6015 # Single Direct & Transformer (1:2.5) &
(1:1.79) SMT 0.19" 0.63" 1.13"
B-3227 (-27) # Single Direct & Transformer (1:2.5) &
(1:1.79) SMT 0.29" 0.63" 1.13"
MLP-3305 Single Direct & Transformer (1:2.5) &
(1:1.79) Through Hole 0.185" 0.4" 0.4"
B-3226 (-26) # Single Direct & Transformer (1:2.5) &
(1:1.79) Through Hole 0.25" 0.625" 0.625"
HLP-6014 # Single Direct & Transformer (1:2.5) &
(1:1.79) Flat Pack 0.19" 0.63" 1.13"
B-3231 (-31) # Single Direct & Transformer (1:2.5) &
(1:1.79) Flat Pack 0.29" 0.63" 1.13"
DSS-2005 Dual (Side-by-Side) Direct (1:2.5) SMT 0.13" 0.72" 0.96"
DSS-2205 Dual (Side-by-Side) Transformer (1:1.79) SMT 0.13" 0.72" 0.96"
DSS-1005 Dual (Side-by-Side) Direct & Transformer (1:2.5) &
(1:1.79) SMT 0.165" 0.72" 0.96"
TSM-2005 Dual (Stacked) Direct (1:2.5) SMT 0.32" 0.4" 0.52"
TSM-2205 Dual (Stacked) Transformer (1:1.79) SMT 0.32" 0.4" 0.52"
TST-9117 # Dual (Stacked) Direct & Transformer (1:2.5) &
(1:1.79) SMT 0.335" 1.125" 1.125"
TST-9107 # Dual (Stacked) Direct & Transformer (1:2.5) &
(1:1.79) Through Hole 0.335" 0.625" 0.625"
TST-9127 # Dual (Stacked) Direct & Transformer (1:2.5) &
(1:1.79) Flat Pack 0.335" 0.625" 0.625"