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MFL2815D 데이터시트 PDF




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부품번호 MFL2815D 기능
기능 (MFL Series) DC/DC Converters
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MFL2815D 데이터시트, 핀배열, 회로
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




MFL2815D pdf, 반도체, 판매, 대치품
MFL SERIES
65 WATT
DC/DC CONVERTERS
SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL
+
28V
Inhibit
Sync In
+
28V
Inhibit
Sync In
1 Positive Input
2 Input Common
3 TR1
4 INH1
5 Sync Out
6 Sync In
MSTR/INH2 12
Slave 11
Pos. Sense 10
Sense Return 9
Output Common 8
7
Positive Output
REMOTE SENSE CONNECTION
1 Positive Input
2 Input Common
3 TR1
4 INH1
5 Sync Out
6
Sync In
MSTR/INH2 12
Slave 11
Pos. Sense 10
9
Sense Return
8
Output Common
7
Positive Output
OUTPUT VOLTAGE ADJUST CONNECTION
RA
VOUT INCREASE
(VOLT)
0.1
0.2
0.3
0.4
0.5
RA (OHMS)
5–V 12–V 15–V
70 25 20
140 50 40
210 75 60
280 100 80
350 125 100
FIGURE 1: SENSE CONNECTIONS AND TRIM TABLE
+
RL
+
RL
+
28V
Inhibit
Sync In
1 Positive Input
MSTR/INH2 12
2 Input Common
Slave 11
3 TR1
4 INH1
Pos. Sense 10
MASTER Sense Return 9
5 Sync Out
6 Sync In
8
Output Common
7
Positive Output
CONNECT ONLY WHEN 2 SLAVES ARE USED
1 Positive Input
MSTR/INH2 12
2 Input Common
Slave 11
3 TR1
4 INH1
Pos. Sense 10
SLAVE 1 Sense Return 9
5 Sync Out
6 Sync In
Output Common 8
Positive Output 7
1 Positive Input
MSTR/INH2 12
2 Input Common
Slave 11
3 TR1
4 INH1
5 Sync Out
6 Sync In
Pos. Sense 10
SLAVE 2 Sense Return 9
Output Common 8
Positive Output 7
FIGURE 2: PARALLEL CONNECTIONS
+
RL
®
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MFL2815D 전자부품, 판매, 대치품
DC/DC CONVERTERS
Angled corner indicates pin one
MFL SERIES
65 WATT
1.505 max (38.23)
CASE U
TOP VIEW
(PIN SIDE)
See Figure 18 for dimensions
Angled corner
indicates pin one.
1.505 (38.23) max.
1.380 (35.05)
1.250 (31.75)
1.050 (26.67)
0.850 (21.59)
0.650 (16.51)
0.450 (11.43)
0.250 (6.35)
0.120 (3.05)
0.000
3.005 (76.33) max.
Materials
Header Cold Rolled Steel/Nickel/Gold
Cover Kovar/Nickel
Pins #52 alloy/Gold
compression glass seal
FIGURE 17: CASE U MAXIMUM DIMENSIONS
0.23 (5.8) Lead Length
1
2
3
TOP VIEW CASE U
4
5
6
12
11
10
9
8
7
Seam Seal
0.128 dia
(3.25).
0.040 dia
(1.02)
FIGURE 18: CASE U
CAUTION
Heat from reflow or wave soldering may damage the
device. Solder pins individually with heat application not
exceeding 300°C for 10 seconds per pin.
Case dimensions in inches (mm)
Tolerance ±0.005 (0.13) for three decimal places, ±0.01
(0.2) for two decimal places unless otherwise specified
Although every effort has been made to render the case
drawings at actual size, variations in the printing process
may cause some distortion. Please refer to the numerical
dimensions for accuracy.
®
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