User`s manual
BL1600 Specifications s 77
.mA150
V5
−
−
=
IN
V
P
I
(B-1)
Installation Concepts
Connectors
Ideally, you should place a single, solid conductor in a screw clamp
terminal. Bare copper, particularly if exposed to the air for a long period
before installation, can become oxidized. The oxide can cause a high-
resistance (~20 Ω) connection, especially if the clamping pressure is not
sufficient. To avoid this, use tinned wires, clean, shiny copper wire, or
crimp the connector.
If you are using multiple conductors or stranded wire, consider soldering
the wire bundle or using a crimp connector to avoid a loss of contact
pressure to a spontaneous rearrangement of the wire bundle at a later time.
Soldering may make the wire subject to fatigue failure at the junction with
the solder if there is flexing or vibration.
Power Consumption and Heat Dissipation
With the standard heat sink, the total thermal resistance at the voltage
regulator is about 15.2°C/W. The smaller heat sink has a thermal resis-
tance of about 25.2°C/W. The maximum junction temperature of the regu-
lator is 125°C.
If the BL1600 is drawing 3 W, the regulator (with the large heat sink) will
operate at
T
A
+ 3 × 15.2°C = 95.6°C
for an ambient temperature, T
A
, of 50°C. The maximum power dissipation
would be
W
T
= (125°C 50°C)/(15.2°C/W) = 4.93 W for the large heat sink
W
T
= (125°C 50°C) /(25.2°C/W) = 2.98 W for the small heat sink
at 50°C. Additional power draw is possible if forced convection cooling is
provided.
The BL1600 draws about 150 mA from the total current available.
Therefore, the current available to external accessories or additional
onboard devices is
If the input voltage is 12 V, the total current available to accessories is
560mA with the standard heat sink (5 W) and 270 mA with the small heat
sink (3 W). For a 24 V input, the total current available is 90 mA with the
standard heat sink, and no power is left over with the small heat sink.
These values are approximate.