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PDF MFL2812D Data sheet ( Hoja de datos )
| Número de pieza | MFL2812D | |
| Descripción | (MFL Series) DC/DC Converters | |
| Fabricantes | Interpoint | |
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FEATURES
• –55° to +125°C operation
DC/DC CONVERTERS
MFL SERIES
65 WATT• 16 to 40 VDC input
m 28 VOLT INPUT• Fully Isolated
o• Magnetic feedback
.c• Fixed frequency, 600 kHz typical
U• Topology – Single Ended Forward
t4• 50 V for up to 50 ms transient protection
• Inhibit (input & output side)
e• Sync function (in and out)
he• Output trim on single output models
• Indefinite short circuit protection
MODELS
VDC OUTPUT
SINGLE
5
12
15
28
DUAL
±5
±12
±15
taS• Remote sense on single output models
• Up to 87% efficiency / 43 W/in3
a m• Parallelable up to 148 watts
.D Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
w oCase U
Weight: 100 grams maximum
ww .cScreening: Standard, ES, or 883 (Class H).
t4UDESCRIPTION
eThe MFL Series™ 28-volt DC/DC converters are rated up to 65
watts of output power over a –55°C to +125°C temperature range
with a 28 Vdc nominal input. On dual output models up to 70% of
ethe rated output power can be drawn from either the positive or
negative output. Current sharing allows the units to be paralleled for
htotal power of up to 148watts. 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 43 watts per cubic inch.
SDESIGN FEATURES
taThe MFL Series converters are switching regulators that use a
quasi-square wave, single ended forward converter design with a
constant switching frequency of 600 kHz.
aIsolation between input and output circuits is provided with a trans-
former in the forward path and a wide bandwidth magnetic coupling
in the feedback control loop. The MFL uses a unique dual loop feed-
.Dback technique that controls output current with an inner feedback
mloop and an output voltage with a cascaded voltage mode feedback
loop.
w .coThe additional secondary current mode feedback loop improves
transient response in a manner similar to primary current mode
Ucontrol and allows for ease of paralleling, but without the cost and
w t4complexity.
eThe cascaded constant frequency, pulse-width modulated
econverters use a quasi-square wave single-ended forward design.
w hTight load regulation is achieved through a wide-bandwidth
magnetic feedback circuit. The output on single MFL models can be
Strimmed (see Figure 1 for voltage changes with different resistor
tavalues).
INHIBIT
The MFL Series converters have two TTL compatible inhibit termi-
nals (INH1 and INH2) that can be used to disable power conversion,
resulting in a very low quiescent input current and no generation of
switching noise. An open collector TTL compatible low (<0.8 volts)
is required to inhibit the converter between INH1 (pin 4) and Input
Common (pin 2). An open collector TTL compatible low (<0.5 volts)
is required to inhibit the converter between INH2 (pin 12) and Output
Common (pin 8). The application of intermediate voltages to these
pins (1.5 to 10.5 volts) should be avoided.
CURRENT AND PARALLEL OPERATION
Multiple MFL 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 MFL converters. In current sharing mode,
one MFL 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 synchro-
nizing 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, 76% of the total combined power ratings of the
MFL converters are available at the load. Overload and short circuit
performance are not adversely affected during parallel operation.
ww.Da®
w1
1 page  
DC/DC CONVERTERS
PIN OUT
Pin Single Output
MFL2828S
Dual Output
1 Positive Input Positive Input Positive Input
2 Input Common Input Common Input Common
3 Triple (TRI)
Triple (TRI)
Triple (TRI)
4 Inhibit 1 (INH1) Inhibit 1 (INH1) Inhibit 1 (INH1)
5 Sync Out
Sync Out
Sync Out
6 Sync In
Sync In
Sync In
7 Positive Output Positive Output Positive Output
8 Output Common No connection Output Common
9 Sense Return Output Common Negative Output
10 Positive Sense No connection No connection
11 Slave
Slave
Slave
12 Master/ Inhibit 2 Master/ Inhibit 2 Master / Inhibit 2
Angled corner indicates pin one.
1
2
3 TOP VIEW
MFL
4 (Pin side, marked side)
5
6
MFL SERIES
65 WATT
12
11
10
9
8
7
Pin 6 should be connected to input common if
external sync (Sync In) is not used.
Sense pins must be connected to their respective
outputs if not used.
See Section B8, case U1, for dimensions.
FIGURE 3: PIN OUT
MODEL NUMBERING KEY
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
MFL 28 05 S / ES
Screening
(Standard screening has no designator
in this position.)
SMD NUMBERS
STANDARD MICROCIRCUIT
DRAWING (SMD)
MFL SERIES
SIMILAR PART
5962-9316301HXC
5962-9316201HXC
5962-9316101HXC
IN PROCESS
5962-9319101HXC
5962-9319201HXC
5962-9319301HXC
MFL2805S/883
MFL2812S/883
MFL2815S/883
MFL2828S/883
MFL2805D/883
MFL2812D/883
MFL2815D/883
For exact specifications for an SMD product, refer to the
SMD drawing. See Section A3, SMDs, for more information.
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
90
85 16V
80 28V
75
40V
70
65
6010 20 30 40
Output (Watts)
50
MFL2805S & MFL2805D Efficiency
FIGURE 4
90 16V
85
80
28V
75
40V
70
65
6010 20 30 40 50 60
Output Power (Watts)
MFL2812S & MFL2812D Efficiency
FIGURE 5
90 16V
85
80
28V
75
70 40V
65
60
10 20 30 40 50 6065
Output Power (Watts)
MFL2815S & MFL2815D Efficiency
FIGURE 6
®
5
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| PDF Descargar | [ Datasheet MFL2812D.PDF ] | |
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