SMFL283R3S_10 Datasheet, PDF (2/15 Pages) Interpoint Corporation Company – Operating temperature -55° to +125°C Qualified to MIL-PRF-38534 Class H and K

Crane Aerospace & Electronics Power Solutions
SMFL Single and Dual DC/DC Converters
28 Volt input – 65 Watt
sharing mode, one SMFL converter is designated as a master.
The SLAVE pin (pin 11) of the master is left unconnected and the
MSTR/INH2 pin (pin 12) of the master is connected to the SLAVE
pin (pin 11) of the slave units. The units designated as slaves
have the MSTR/INH2 pin (pin 12) connected to the SNS RTN pin
(pin 9). Note that synchronizing the units together is not required
for current sharing operation. 
A second slave unit may be placed in parallel with a master and
slave; this requires the TRI pin (pin 3) of the master unit to be
connected to the SNS RTN pin (pin 9). See Figure 2 for a block
diagram of parallel connections.
When paralleled, 76% of the total combined power ratings of the
SMFL converters are available at the load. Overload and short
circuit performance are not adversely affected during parallel
­operation.
Operating Conditions and characteristics
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for 120 ms transient
Output Power
• 40 to 65 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• -65°C to +150°C
Power Dissipation (Pd)
• 14 watts (16 watts SMFL2805S, SMFL2805D)
Case Operating Temperature (Tc)
• -55°C to +125°C full power
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
• MFL283R3S: linearly from 100% at 100°C
to 85% at 125°C to 0% at 135°C
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Input to Output Capacitance
• 150 pF, typical
Current Limit
• 125% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 50 dB typical
Conversion Frequency (-55°C to 125°C)
• Free run mode 600 kHz typical
‣‣ 5 25 kHz. min, 675 kHz max
Sync and inhibit (inh1, inh2)
Sync
• Sync In
‣‣Input frequency 525 to 675 Hz.
‣‣Duty cycle 40% min, 60% max
‣‣Logic low 0.8 V max
‣‣Logic high 4.5 V min, 5 V max
‣‣Referenced to input common
• Sync Out
‣‣Referenced to input common
Inhibit (INH1, INH2)
• Active low (output disabled)
‣‣INH1 referenced to input common
-- Active low 0.8 V max
-- Inhibit pin current 10 mA max
‣‣INH2 referenced to output common
-- Active low 0.5 V max
-- Inhibit pin current 5 mA max
• Active high (output enabled)
‣‣Open collector (output enabled)
‣‣Avoid intermediate voltages of 1.5 to 10.5
‣‣Open pin voltage
-- INH1 = 9 to 12 V
-- INH2 = 9 V max
mechanical and environmental
Size (maximum)
• 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm
See case U for dimensions.
• Case option V is also available.
Weight (maximum)
• 86 grams
Screening
Space Prototype (O), Class H, or Class K are radiation tolerant
to Radiation Hardness Assurance (RHA) levels of “-” (O), “P,”
or “R,” per MIL-STD-38534. Interpoint model numbers use an
“O” in the RHA designator position to indicate the “-” (dash)
Radiation Hardness Assurance level of MIL-PRF-38534, which is
defined as “no RHA”.
See Screening Tables 1 - 3 for more information. Available
configurations: OO, HP, KP, HR, KR
www.craneae.com/interpoint
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SMFL Rev K - 20101209