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SFS Series Data Sheet
43W SMT DC-DC Converters, 1.5 – 5 V Output
Auxiliary Functions Data
All specifications apply over input voltage, output load and temperature range, unless otherwise noted.
Parameter
Conditions/Description
Min
Nom
Max
Units
Shutdown Control :
Converter OFF
Converter ON
Sink Current
Shutdown pin is pulled low
Voltage source or open circuit
V i = V i nom
–1.0
3.5
0.3
1.0
6
V
V
mA
Synchronization:
Frequency Range
Voltage Sense Range
TTL compatible square wave on
sync pin. Referenced to –Vi
Available compensation
700
±10
800
kHz
%
Temperature Derating Curves
The derating curves below give an indication of the output power achievable with and without forced-air cooling.
However in the final application, in order to ensure the reliability of the unit, care must be taken to ensure the
maximum case temperature is not exceeded under any conditions.
Output Power vs Ambient Temp. and Airflow
120
100
80
60
40
20
800LFM (4 m/s)
400LFM (2 m/s)
200LFM (1 m/s)
100LFM (0.5 m/s)
0 LFM
0
Ambient Temperature (°C)
Note : For continuous operation above 60 V input, the available output power is further derated linearly up to 50% at 75 V input. This
additional derating is due to a predictable drop in efficiency at high input voltage.
BCD.00016 Rev. AA, 3-Sep-2010
Page 8 of 14
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