INTERPOINT MFL2812S/883

FEATURES
•
•
•
•
•
•
•
•
•
•
•
•
•
•
–55° to +125°C operation
16 to 40 VDC input
Fully Isolated
Magnetic feedback
Fixed frequency, 600 kHz typical
Topology – Single Ended Forward
50 V for up to 50 ms transient protection
Inhibit (input & output side)
Sync function (in and out)
Output trim on single output models
Indefinite short circuit protection
Remote sense on single output models
Up to 87% efficiency / 43 W/in3
Parallelable up to 148 watts
DC/DC CONVERTERS
28 VOLT INPUT
MFL SERIES
65 WATT
MODELS
VDC OUTPUT
SINGLE
5
12
15
28
DUAL
±5
±12
±15
Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
Case U
Weight:
100 grams maximum
Screening: Standard, ES, or 883 (Class H).
DESCRIPTION
The 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
the rated output power can be drawn from either the positive or
negative output. Current sharing allows the units to be paralleled for
total 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.
DESIGN FEATURES
The 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.
Isolation between input and output circuits is provided with a transformer in the forward path and a wide bandwidth magnetic coupling
in the feedback control loop. The MFL uses a unique dual loop feedback technique that controls output current with an inner feedback
loop and an 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, but without the cost and
complexity.
The cascaded constant frequency, pulse-width modulated
converters use a quasi-square wave single-ended forward design.
Tight load regulation is achieved through a wide-bandwidth
magnetic feedback circuit. The output on single MFL models can be
trimmed (see Figure 1 for voltage changes with different resistor
values).
INHIBIT
The MFL 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 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 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, 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.
®
1
DC/DC CONVERTERS
MFL SERIES
65 WATT
ABSOLUTE MAXIMUM RATINGS
SYNC AND INHIBIT (INH1, INH2)
TYPICAL CHARACTERISTICS
Sync In (525 to 675 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min, 9 V max
• Referenced to input common
• If not used, connect to input common
Sync Out
• Referenced to input common
Inhibit (INH1, INH2) TTL Open Collector
• Logic low (output disabled)
INH1 referenced to input common
Logic low 0.8 V max
Inhibit pin current 10 mA max
INH2 referenced to output common
Logic low 0.5 V max
Inhibit pin current 5 mA max
• Logic high (output enabled)
Open collector
Input Voltage
• 16 to 40 VDC
Power Dissipation (Pd)
• 14 watts (16 watts MFL2805S, MFL2805D)
Output Power
• 50 to 65 watts depending on model
Lead Soldering Temperature (10 sec per lead)
• 300°C
Storage Temperature Range (Case)
• –65°C to +150°C
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 16 to 40 VDC continuous
• 50 V for 120 msec transient
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derate 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
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 50 dB typical
Conversion Frequency
• Free run mode 600 kHz typical
550 kHz. min, 650 kHz max
• External sync range 525 to 675 kHz
Inhibit Pin Voltage (unit enabled)
• INH1 = 9 to12 V, INH2 = 6 to 9 V
PINS NOT USED
TR1, Master, and Slave
If not used, leave unconnected
Electrical Characteristics: –55°C to +125° C1 Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
MFL2812S
MFL2815S
MFL2828S1
MIN TYP MAX
11.88 12.00 12.12
MIN TYP MAX
14.85 15.00 15.15
MIN TYP MAX1
27.72 28.00 28.28
MFL2805S
CONDITION
Tc = 25°C
MIN
4.95
OUTPUT CURRENT
VIN = 16 TO 40 VDC
0
—
10
0
—
5
0
—
4.33
0
—
2.32
A
OUTPUT POWER
VIN = 16 TO 40 VDC
0
—
50
0
—
60
0
—
65
0
—
65
W
OUTPUT RIPPLE
TYP MAX
5.00 5.05
Tc = 25°C
—
15
35
—
30
75
—
30
85
—
100
200
Tc = –55°C to +125°C
—
30
50
—
45
100
—
45
110
—
—
—
LINE REGULATION
VIN = 16 to 40 VDC
—
0
20
—
0
20
—
0
20
—
20
60
LOAD REGULATION
NO LOAD TO FULL
—
0
20
—
0
20
—
0
20
—
20
75
mV
INPUT VOLTAGE
NO LOAD TO FULL
CONTINUOUS
TRANSIENT2 50 ms
16
—
28
—
40
50
16
—
28
—
40
50
16
—
28
—
40
50
16
—
28
—
40
50
VDC
V
NO LOAD
FULL LOAD
INHIBITED - INH1
—
—
—
70
—
9
120
2.5
14
—
—
—
50
—
9
80
2.8
14
—
—
—
50
—
9
80
3.0
14
—
—
—
60
—
9
100
2.8
14
mA
A
INHIBITED - INH2
—
35
70
—
35
70
—
35
70
—
35
70
VOLTAGE 10 k - 2 MHz
INPUT CURRENT
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT3
STEP LOAD RESP.
STEP LINE RESP.
START-UP
mV p-p
mV
mA
10 kHz - 10 MHz
—
15
50
—
15
50
—
15
50
—
20
50
mA pp
Tc = 25°C
POWER DISSIPATION
SHORT CIRCUIT
Tc = 25°C
77
80
—
83
86
—
84
87
—
83
86
—
%
—
12.5
16
—
10
14
—
10
14
—
7
14
A
RECOVERY
—
1.5
4
—
1.5
4
—
1.5
4
—
1.0
4
ms
50% – 100% – 50%
TRANSIENT
RECOVERY4
—
—
250
1.5
350
3.0
—
—
450
1.5
600
3.0
—
—
500
1.5
600
3.0
—
—
800 1400
1.5
3.0
mV pk
ms
16 – 40 – 16 VDC
TRANSIENT5
RECOVERY4
—
—
250
200
300
300
—
—
250
200
400
300
—
—
250
200
400
300
—
—
250
200
800
400
mV pk
µs
DELAY
OVERSHOOT
—
—
3.5
0
6
25
—
—
3.5
0
6
50
—
—
3.5
0
6
50
—
—
3.5
0
6
100
ms
mV pk
Notes
1. MFL2828S specifiications are at 25°Tc, contact your Interpoint representative for more information.
2. Unit will shut down above approximately 45V but will be undamaged and
will restart when voltage drops into normal range.
3. Indefinite short circuit protection not guaranteed above 125°C case.
4. Recovery time is measured from application of the transient to point at
which Vout is within 1% of final value.
5. Transition time ≥ 10 µs.
®
2
UNITS
VDC
MFL SERIES
65 WATT
DC/DC CONVERTERS
Electrical Characteristics: –55°C to +125°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
CONDITIONS
+VOUT
Tc = 25°C
–VOUT
MFL2805D
MIN TYP MAX
4.95 5.00 5.05
4.92 5.00 5.08
MFL2812D
MIN TYP MAX
11.88 12.00 12.12
11.82 12.00 12.18
MFL2815D
MIN TYP MAX
14.85 15.00 15.15
14.77 15.00 15.23
UNITS
VDC
OUTPUT CURRENT1
EACH OUTPUT
0
—
7
0
—
3.5
0
—
3.03
VIN = 16 TO 40 VDC
TOTAL OUTPUT
0
—
10
0
—
5
0
—
4.34
VIN = 16 TO 40 VDC
0
—
50
0
—
60
0
—
65
W
10 kHz - 2 MHz
mV p-p
OUTPUT POWER
A
OUTPUT RIPPLE
VOLTAGE +/– VOUT
—
50
100
—
50
120
—
50
150
LINE REGULATION
+VOUT
—
0
50
—
0
50
—
0
50
VIN = 16 TO 40 VDC
–VOUT
—
25
100
—
25
100
—
25
100
LOAD REGULATION
NO LOAD TO FULL
+VOUT
–VOUT
—
—
0
25
50
100
—
—
10
50
100
120
—
—
10
50
100
150
—
—
5
8
—
—
2
4
—
2
4
CROSS REGULATION
Tc = 25°C
INPUT VOLTAGE
NO LOAD TO FULL
INPUT CURRENT
Tc = 25°C
SEE NOTE 2
SEE NOTE 3
3
6
CONTINUOUS
TRANSIENT4 50 ms.
NO LOAD
FULL LOAD
INHIBITED - INH1
INHIBITED - INH2
16
0
—
—
—
—
28
—
50
—
9
35
40
50
120
—
77
STEP LOAD
RESPONSE ± VOUT
10 kHz - 10 MHz
BALANCED LOAD
POWER DISSIPATION
SHORT CIRCUIT
RECOVERY
50 %–100%– 50% LOAD
TRANSIENT
STEP LINE
RESPONSE ± VOUT
RECOVERY6
16 – 40 – 16 VIN
TRANSIENT7
RECOVERY6
DELAY
OVERSHOOT
INPUT RIPPLE
CURRENT
EFFICIENCY 25°C Tc
LOAD FAULT5
Tc = 25°C
START–UP
2
4
—
2
4
mV
mV
%
28
—
50
—
9
35
40
50
100
2.80
14
70
16
0
—
—
—
—
28
—
50
—
9
35
40
50
100
3.00
14
70
VDC
V
mA
A
14
70
16
0
—
—
—
—
15
80
50
—
—
83
15
86
50
—
—
84
15
87
50
—
mA p-p
%
—
—
12.5
1.5
16
4.0
—
—
10
1.5
14
4.0
—
—
10
1.5
14
4.0
W
ms
—
250
350
—
450
600
—
500
600
mV pk
—
1.5
3.0
—
1.5
3.0
—
1.5
3.0
ms
—
250
300
—
250
400
—
250
400
mV pk
—
—
200
3.5
300
6
—
—
200
3.5
300
6
—
—
200
3.5
300
6
µs
ms
—
0
25
—
0
50
—
0
50
mV p
Notes
1. Up to 70% of the total output power is available from either output providing
the opposite output is simultaneously carrying 30% of the total power.
2. Effect on the
negative output under the following conditions:
+Pout 30% to 70%; –Pout 70% to 30%
3. Effect on the
negative output under the following conditions:
+Pout 50%; –Pout 10% to 50%
mA
4. Unit will shut down above approximately 45V but will be undamaged and will
restart when voltage drops into normal range.
5. Indefinite short circuit protection not guaranteed above 125°C case.
6. Recovery time is measured from application of the transient to point at which
Vout is within 1% of final value.
7. Transition time ≥ 10 µs.
®
3
DC/DC CONVERTERS
MFL SERIES
65 WATT
SINGLE OUTPUT MODELS CONNECTION DIAGRAMS - SENSE AND PARALLEL
28V
+
–
Inhibit
1
Positive Input
2
Input Common
3
TR1
4
INH1
5
6
Sync In
MSTR/INH2 12
Slave 11
Pos. Sense 10
9
Sense Return
Sync Out
Output Common
Sync In
Positive Output
–
8
7
+
RL
REMOTE SENSE CONNECTION
28V
+
–
1
Positive Input
2
Input Common
3
4
Inhibit
5
6
Sync In
MSTR/INH2 12
11
Slave
10
Pos. Sense
9
Sense Return
8
Output Common
7
Positive Output
TR1
INH1
Sync Out
Sync In
RA
–
+
RL
OUTPUT VOLTAGE ADJUST CONNECTION
RA (OHMS)
12–V 15–V
25
20
VOUT INCREASE
(VOLT)
0.1
5–V
70
0.2
140
50
40
0.3
210
75
60
0.4
280
100
80
0.5
350
125
100
FIGURE 1: SENSE CONNECTIONS AND TRIM TABLE
28V
Inhibit
+
–
1
Positive Input
2
Input Common
3
TR1
4
5
Sync In
6
INH1
MSTR/INH2 12
Slave 11
Pos. Sense
MASTER
Sync Out
Sense Return
Output Common
Sync In
Positive Output
10
9
–
8
7
+
RL
CONNECT ONLY WHEN 2 SLAVES ARE USED
1
Positive Input
2
Input Common
3
TR1
4
INH1
5
Sync Out
6
Sync In
1
Positive Input
2
Input Common
3
TR1
4
INH1
5
Sync Out
6
Sync In
SLAVE 1
MSTR/INH2 12
Slave 11
Pos. Sense 10
Sense Return 9
Output Common 8
Positive Output
7
MSTR/INH2 12
Slave 11
Pos. Sense 10
Sense Return 9
Output Common 8
SLAVE 2
Positive Output
7
FIGURE 2: PARALLEL CONNECTIONS
®
4
MFL SERIES
65 WATT
DC/DC CONVERTERS
PIN OUT
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Single Output
Positive Input
Input Common
Triple (TRI)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Sense Return
Positive Sense
Slave
Master/ Inhibit 2
MFL2828S
Positive Input
Input Common
Triple (TRI)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
No connection
Output Common
No connection
Slave
Master/ Inhibit 2
Dual Output
Positive Input
Input Common
Triple (TRI)
Inhibit 1 (INH1)
Sync Out
Sync In
Positive Output
Output Common
Negative Output
No connection
Slave
Master / Inhibit 2
Angled corner indicates pin one.
12
1
11
2
TOP VIEW
MFL
(Pin side, marked side)
3
4
10
9
5
8
6
7
See Section B8, case U1, for dimensions.
FIGURE 3: PIN OUT
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.
SMD NUMBERS
MODEL NUMBERING KEY
MFL
MFL SERIES
SIMILAR PART
STANDARD MICROCIRCUIT
DRAWING (SMD)
5962-9316301HXC
5962-9316201HXC
5962-9316101HXC
IN PROCESS
5962-9319101HXC
5962-9319201HXC
5962-9319301HXC
28 05 S / ES
Base Model
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
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
90
16V
28V
75
40V
70
75
65
60
10
20
30
40
50
40V
70
60
10
Output (Watts)
28V
80
65
16V
85
Efficiency (%)
80
90
16V
85
Efficiency (%)
Efficiency (%)
85
28V
80
75
40V
70
65
20
30
40
50
60
60
10
20
30
40
50
60 65
Output Power (Watts)
Output Power (Watts)
MFL2805S & MFL2805D Efficiency
MFL2812S & MFL2812D Efficiency
MFL2815S & MFL2815D Efficiency
FIGURE 4
FIGURE 5
FIGURE 6
®
5
DC/DC CONVERTERS
MFL SERIES
65 WATT
Typical Performance Curves: 25°C Tc , 28 VDC Vin, 100% load, free run, unless otherwise specified.
90
0.
16 VIN
70
65
0
10
20 30 40 50 60 70
40.
Vout
60.
80.
100.
0.1
1
10
Vin
50 µs/div
16 to 40 V
100
Output Power (Watts)
Frequency (kHz)
MFL2828S Efficiency
MFL Series Audio Rejection
MFL2805S Step Line Response
FIGURE 9
FIGURE 8
20V/div.
FIGURE 7
100mV/div.
100% to 50%
20V/div.
60
100mV/div.
40 VIN
75
20.
20V/div.
28 VIN
80
Attenuation (dB)
Efficiency (%)
85
Vin
Vin
50% to 100%
Vout
–Vout
1ms/div
No Load
1ms/div
MFL2805S Step Load Response
100mV/div.
1V/div.
+Vout
MFL2805S Turn On Response
FIGURE 10
50 µs/div
16 to 40 V
MFL2815D Step Line Response
FIGURE 12
FIGURE 11
100% to 50%
1ms/div
MFL2815D Step Load Response
VIN
+Vout
–Vout
1ms/div
No Load
MFL2815D Turn On Response
–Vout Voltage Change (%)
5V/div.
200mV/div.
–Pout = 32.5W
20V/div.
8
50% to 100%
6
MFL2805D
4
2
MFL2812D
0
MFL2815D
–2
–4
–6
–8
30
40
50
60
Cross Regulation
FIGURE 14
FIGURE 13
FIGURE 15
Input Voltage (Volts)
16
15
MFL2815S & 15D
14
13
MFL2805S & 5D
12
MFL2812S & 12D
11
10
20
30
40
50
60 65
Output Power (Watts)
Low Line Dropout
FIGURE 16
®
6
70
Output Load (%)
+Pout 80 to 20 %, –Pout 20 to 80%
MFL SERIES
65 WATT
DC/DC CONVERTERS
Angled corner indicates pin one
CASE U
TOP VIEW
(PIN SIDE)
See Figure 18 for dimensions
1.505 max (38.23)
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
Seam Seal
Angled corner
indicates pin one.
0.23 (5.8) Lead Length
0.128 dia
(3.25).
1.505 (38.23) max.
0.040 dia
(1.02)
1.380 (35.05)
1.250 (31.75)
1
12
1.050 (26.67)
2
11
0.850 (21.59)
3
0.650 (16.51)
4
9
0.450 (11.43)
5
8
0.250 (6.35)
6
7
10
TOP VIEW 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.
0.220 (5.59
0.050 (1.27)
0.000
0.410 (10.41) max.
FIGURE 18: CASE U
2.880 (73.15)
3.005 (76.33) max.
2.750 (69.85)
0.120 (3.05)
0.250 (6.35)
0.000
0.120 (3.05)
0.000
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.
®
7
DC/DC CONVERTERS
MFL SERIES
65 WATT
ENVIRONMENTAL SCREENING
TEST
STANDARD
/ES
/883 (Class H)*
PRE-CAP INSPECTION
Method 2017, 2032
yes
yes
yes
TEMPERATURE CYCLE (10 times)
Method 1010, Cond. C, -65°C to 150°C
Method 1010, Cond. B, -55°C to 125°C
no
no
no
yes
yes
no
CONSTANT ACCELERATION
Method 2001, 3000 g
Method 2001, 500 g
no
no
no
yes
yes
no
BURN-IN
Method 1015, 160 hours at 125°C
96 hours at 125°C case (typical)
no
no
no
yes
yes
no
FINAL ELECTRICAL TEST MIL-PRF-38534, Group A
Subgroups 1 through 6: -55°C, +25°C, +125°C
Subgroups 1 and 4: +25°C case
no
yes
no
yes
yes
no
HERMETICITY TESTING
Fine Leak, Method 1014, Cond. A
Gross Leak, Method 1014, Cond. C
Gross Leak, Dip (1 x 10-3)
no
no
yes
yes
yes
no
yes
yes
no
FINAL VISUAL INSPECTION
Method 2009
yes
yes
yes
Test methods are referenced to MIL-STD-883 as determined by MIL-PRF-38534.
*883 products are built with element evaluated components and are 100% tested and guaranteed over
the full military temperature range of –55°C to +125°C.
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8
20022-001-DTS Rev B
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