Crane Aerospace & Electronics Power Solutions
SMFL Single and Dual DC/DC Converters
28 Volt input – 65 Watt
SMFL converters. In current 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, up to 95% of the total combined power ratings
of the SMFL converters is available at the load. Overload and
short circuit performance are not adversely affected during
parallel operation.
conversion Frequency (-55°c to 125°c)
• Free run mode 600 kHz typical
‣
525 kHz. min, 675 kHz max
operating conditions and characteristics
input Voltage range
• 16 to 40 VDC continuous
• 80 V for 50 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
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
sync and inhibit (inh1, inh2)
sync
• Sync In
‣
Input frequency 525 to 675 Hz.
‣
Duty cycle 40% min, 60% max
‣
Active low 0.8 V max
‣
Active high 4.5 V min, 5 V max
‣
Referenced to input common
• Sync Out
‣
Referenced to input common
inhibit: inh1 and inh2
(do not apply a voltage to the inhibit pin)
• Converter Disabled (active low)
‣
INH1 referenced to input common
- Pull voltage to 0.8 V or below by connecting to ground or
other method.
- Inhibit pin source current, 10 mA max
‣
INH2 referenced to output common
- Pull voltage to 0.5 V or below by connecting to ground or
other method.
- Inhibit pin source current 5 mA max
• Converter Enabled (active high)
‣
Inhibit pin open or through an open collector
‣
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).
Case u has short, straight leads. Case V has longer leads
which are bent down.
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-PRF-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”.
• Available configurations: OO, HP, KP, HR, KR.
• See Screening Tables 1 and 2 for more information.
www.craneae.com/interpoint
Page 2 of 14
SMFL Rev AA - 2012.03.19
INTERPOINT [ INTERPOINT CORPORATION COMPANY ]
