SMFLHP2805D/KR INTERPOINT [Interpoint Corporation Company], SMFLHP2805D/KR Datasheet
SMFLHP2805D/KR
Manufacturer Part Number
SMFLHP2805D/KR
Description
DC/DC CONVERTERS 28 VOLT INPUT
Manufacturer
INTERPOINT [Interpoint Corporation Company]
Datasheet
1.SMFLHP2805DKR.pdf
(6 pages)
F
• Fully qualified to Class H or K
• –55° to +125°C operation
• 19 to 40 VDC input
• Fully Isolated
• Magnetic feedback
• Fixed frequency, 600 kHz typical
• Topology – Single Ended Forward
• Inhibit function – input and output
• Sync function
• Output trim on single output models
• Indefinite short circuit protection
• Remote sense on single output models
• Up to 87% efficiency
• Parallelable up to 270 watts
DESCRIPTION
The SMFLHP Series™ 28 volt DC/DC converters are rated up to
100 watts output power over a –55° to +125°C temperature range
with a 28 Vdc nominal input. On dual output models, up to 70% of
the rated output power can be drawn from either the positive or
negative outputs. Current sharing allows the units to be paralleled
for total power of up to 270 watts. The welded, hermetically sealed
package is only 3.005 x 1.505 x 0.400 inches, giving the series an
overall power density of up to 67 watts per cubic inch.
S
SMFLHP converters offer screening options to Space Prototype (O),
Class H, or Class K. Available radiation hardness (RHA) levels are
O or R. See “QA Screening: Class H and K, QML” for more infor-
mation.
D
The SMFLHP Series converters are switching regulators that use a
quasi-square wave, single ended forward converter design with a
constant switching frequency of 600 kHz.
Isolation between input and output circuits is provided with a trans-
former in the forward path and wide bandwidth magnetic coupling in
the feedback control loop. The SMFLHP Series uses a unique dual
loop feedback technique that controls output current with an inner
feedback loop and output voltage with a cascaded voltage mode
feedback loop.
The additional secondary current mode feedback loop improves
transient response in a manner similar to primary current mode
control and allows for ease of paralleling.
Tight load regulation is achieved through a wide-bandwidth
magnetic feedback circuit. The output voltage on single SMFLHP
models can be easily trimmed by adding an external resistor. (See
Figure 1 for voltage changes with different resistor values.)
EATURES
CREENING
ESIGN
F
EATURES
Size (max.): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
Weight:
Screening: Space Prototype, Class H, or Class K
Available configurations: OO, HO, HR, KR
DC/DC C
See cases “U maximum dimensions” and “U” for dimensions.
86 grams maximum
Radiation hardness levels O or R
See “QA Screening: Class H and K, QML” for more information.
28 V
Contact Information
OLT
ONVERTERS
I
The SMFLHP Series converters have two TTL compatible inhibit
terminals (INH1 and INH2) that can be used to disable power
conversion, resulting in a very low quiescent input current. An open
collector TTL compatible low (<0.8 volts) is required between INH1
(pin 4) and Input Common (pin 2) to inhibit the converter. An open
collector TTL compatible low (<0.5 volts) is required between INH2
(pin 12) and Output Common (pin 8) to inhibit the converter. The
application of intermediate voltages to these pins (1.5 to 10.5 volts)
should be avoided.
C
Multiple SMFLHP converters may be used in parallel to drive a
common load (see Figure 2). In this mode of operation the load
current is shared by two or three SMFLHP converters. In current
sharing mode, one SMFLHP 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).
Figure 2 shows the typical setup for two or three units in parallel.
Note that synchronizing the units together (though shown in the
figure) 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).
When paralleled, 90% of the total combined power ratings of the
SMFLHP converters are available at the load. Overload and short
circuit performance are not adversely affected during parallel
operation.
NHIBIT
I
URRENT
NPUT
Interpoint, a Crane Co. Company
PO Box 97005 • Redmond WA 98073-9705
425-895-4053 • electronics@craneae.com
www.craneae.com/power
S
HARING AND
P
ARALLEL
SMFLHP SERIES
SINGLE
3.3
12
15
O
5
VDC O
PERATION
MODELS
100 WATT
UTPUT
DUAL
±12
±15
±5
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SMFLHP2805D/KR Summary of contents
Page 1
F EATURES • Fully qualified to Class • –55° to +125°C operation • VDC input • Fully Isolated • Magnetic feedback • Fixed frequency, 600 kHz typical • Topology – Single Ended Forward • ...
Page 2
SMFLHP SERIES 100 WATT ABSOLUTE MAXIMUM RATINGS Input Voltage • VDC Power Dissipation (Pd) • 20 watts Output Power • 100 watts depending on model Lead Soldering Temperature (10 sec per lead) • 300°C Storage ...
Page 3
Tc Electrical Characteristics: DUAL OUTPUT MODELS PARAMETER CONDITIONS OUTPUT VOLTAGE Tc = 25°C 1 OUTPUT CURRENT EACH OUTPUT VDC IN 1 OUTPUT POWER EACH OUTPUT VDC IN ...
Page 4
SMFLHP SERIES 100 WATT SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL + 28V – Inhibit Sync In + 28V – Inhibit Sync In + 28V – Inhibit Sync In DC/DC C ONVERTERS 1 Positive Input MSTR/INH2 2 Input ...
Page 5
DC/DC C Pin Single Output Dual Output 1 Positive Input Positive Input 2 Input Common Input Common 3 Triple (TRI) Triple (TRI) 4 Inhibit 1 (INH1) Inhibit 1 (INH1) 5 Sync Out Sync Out 6 Sync In Sync In 7 ...
Page 6
SMFLHP SERIES 100 WATT Typical Performance Curves: 25° VDC Vin, 100% load, free run, unless otherwise specified. 0 100 Frequency (kHz) SMFLHP Series Audio Rejection F 7 IGURE Vin Vout 1ms/div No Load SMFLHP2805S Turn ...