F
EATURES
• EMI input filter, up to
50 dB attenuation
• –55° to +125°C operation
• High frequency output filter
• 17 to 40 VDC input
• Fully isolated, magnetic feedback
• 600 kHz typical–Single Ended Forward
• Inhibit and synchronization functions
• Indefinite short circuit protection
• Trim and remote sense on singles
• Up to 83% efficiency
• Up to 50V for 50 ms transient
protection
EMI F
ILTERED
DC/DC C
ONVERTERS
28 V
OLT
I
NPUT
FMTR SERIES
30 WATT
MODELS
VDC O
UTPUT
SINGLE
DUAL
3.3
±5
5
±12
12
±15
15
Size (max): 3.005 x 1.505 x 0.400 inches (76.33 x 38.23 x 10.16 mm)
Weight:
100 grams maximum
Screening: Standard or ES, see the Environmental Screening table
DESCRIPTION
The FMTR Series™ of DC/DC converters offers up to 30 watts of
output power from single or dual output configurations. They
operate over the full military temperature range with up to 83% effi-
ciency. FMTR converters are packaged in hermetically sealed metal
cases, making them ideal for use in military, aerospace and other
high reliability applications.
B
UILT
-
IN
F
ILTERS
The built-in input and output filters reduce layout issues and
conserve board space. The 2.7 amp EMI input filter meets MIL-STD-
461C, CE03 and allows filtering of additional converters through the
filter output pins. The output filter reduces high frequency common
and differential mode noise. It allows a higher bandwidth ripple
voltage measurement and eliminates the need for external output
decoupling capacitors. Both input and output filters reduce radiated
emissions providing quieter operation than conventional DC/DC
converters.
C
ONVERTER
D
ESIGN
The FMTR converters are constant frequency, pulse-width mod-
ulated switching regulators which use a quasi-square wave, single
ended, forward converter design. Tight load regulation is maintained
via wide bandwidth magnetic feedback and, on single output
models, through use of remote sense.
Indefinite short circuit protection and overload protection are
provided by a constant current-limit feature. This protective system
senses current in the converter’s secondary stage and limits it to
approximately 115% of the maximum rated output current.
W
ARNING
: R
EQUIRED
D
AMPING
N
ETWORK
To prevent damage to the internal circuitry an external capacitor and
resistor are required across the filter outputs (pins 3 and 4) as
shown in Figure 1. This applies to both single and dual output
models. The recommended capacitor type is wet tantalum, MIL-C-
39006.
+Vin
EMI Input Filter 2.7 A max.
28 Vin 8 +
+
4 Filter Output
2.2
Ω
Required
damping
220
µF
network
3 Filter Output Rtn
11 Positive
Output
Additional
DC/DC
Converters
Rtn
Inhibit
~
Input Common 7 –
Inhibit 5
+ Vin
–
Inh
Sync 1
Sync
Inhibit/Sync 2
Return
Sync
Rtn
+
Vout
–
High Frequency
Output Filter
–
DC/DC Converter
10 Output
Common
F
IGURE
1: FMTR T
YPICAL
I
NPUT
I
NTERFACE
A
PPLIES TO
S
INGLES AND
D
UALS
(S
HOWN WITH
S
INGLE
O
UTPUT
)
1
FMTR SERIES
30 WATT
ABSOLUTE MAXIMUM RATINGS
Input Voltage
• 17 to 40 VDC
Output Power
• 25 to 30 watts depending on model
• Input filter current, 2.7 A max.
Lead Soldering Temperature (10 sec per pin)
• 300°C
Storage Temperature Range (Case)
• –65°C to +135°C
DC/DC C
ONVERTERS
SYNC AND INHIBIT
Sync (500 to 675 kHz)
• Duty cycle 40% min, 60% max
• Logic low 0.8 V max
• Logic high 4.5 V min, 5 V max
• Referenced to inh/sync return
• If not used, connect to inh/sync return
Inhibit TTL Open Collector
• Logic low (output disabled)
Voltage
≤0.8
V
Inhibit pin current 8.0 mA max
• Referenced to inh/sync return
• Logic high (output enabled)
Open collector
TYPICAL CHARACTERISTICS
Output Voltage Temperature Coefficient
• 100 ppm/°C typical
Input to Output Capacitance
• 50 pF typ
Current Limit
• 115% of full load typical
Isolation
• 100 megohm minimum at 500 V
Audio Rejection
• 40 dB typical
Conversion Frequency
• Free run 550 min, 600 typ, 650 max kHz
• External sync 500 to 675 kHz
Inhibit Pin Voltage (unit enabled)
• 9 to 11 V
Input Filter DC Resistance
• 0.2 ohms max
RECOMMENDED OPERATING CONDITIONS
Input Voltage Range
• 17 to 40 VDC continuous
• 50V for 50 ms transient protection
Case Operating Temperature (Tc)
• –55°C to +125°C full power
• –55°C to +135°C absolute
Derating Output Power/Current
• Linearly from 100% at 125°C to 0% at 135°C
EMI FILTER
Noise Rejection
500 kHz
1 MHz
5 MHz
- Minimum
55 dB
60 dB
60 dB
Electrical Characteristics: -55°C to +125° Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
SINGLE OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
OUTPUT CURRENT
1
OUTPUT POWER
1
CONDITION
25°C
–55°C TO +125°C
V
IN
= 17 to 40 VDC
V
IN
= 17 to 40 VDC
FMTR283R3S
MIN
3.26
3.20
0
0
—
—
—
—
17
—
—
TYP
3.30
3.30
––
—
70
—
—
—
28
30
7
5
75
72
—
—
1.4
MAX
3.34
3.40
6.06
20
140
180
10
10
40
75
8
10
—
—
10
12
6
FMTR2805S
MIN
4.95
4.85
0
0
—
—
—
—
17
—
—
—
75
72
—
—
—
—
—
—
—
—
—
—
TYP
5.00
5.00
—
—
110
—
15
15
28
35
3
5
77
74
—
—
1.4
FMTR2812S
FMTR2815S
UNITS
VDC
A
W
mV p-p
mV
mV
VDC
mA
mA
mA p-p
%
MAX MIN TYP MAX MIN TYP MAX
5.05 11.88 12.00 12.12 14.85 15.00 15.15
5.15 11.64 12.00 12.36 14.55 15.00 15.45
5.0
0
—
2.5
0
—
2.0
25
220
260
50
50
40
75
8
10
—
—
10
12
5
0
—
—
—
—
17
—
—
—
79
76
—
—
—
—
—
—
—
—
—
—
—
60
—
15
15
28
35
3
5
82
78
—
—
1.4
30
120
160
50
50
40
75
8
10
—
—
10
12
5
0
—
—
—
—
17
—
—
—
80
77
—
—
—
—
—
—
—
—
—
—
—
25
—
15
15
28
35
3
5
83
79
—
—
1.4
30
50
90
50
50
40
75
8
10
—
OUTPUT RIPPLE
25°C
10 kHz – 2 MHz
VOLTAGE
LINE REGULATION
2
V
IN
= 17 to 40 VDC
LOAD REGULATION
INPUT VOLTAGE
1
INPUT CURRENT
1
INPUT RIPPLE
CURRENT
EFFICIENCY
LOAD FAULT
3
NO LOAD TO FULL
NO LOAD TO FULL
NO LOAD
INHIBITED
10 kHz – 10 MHz
—
25°C 73
INCLUDES FILTER
70
POWER DISSIPATION
SHORT CIRCUIT 25°C
–55°C TO +125°C
RECOVERY
4, 6
50% – 100% – 50%
TRANSIENT
RECOVERY
4, 6
17 – 40 – 17 VDC
TRANSIENT
5
RECOVERY
4
DELAY
OVERSHOOT
6
FULL LOAD
NO LOAD
—
—
—
—
—
—
—
—
—
—
10
12
5
W
ms
mV pk
µs
mV pk
µs
ms
STEP LOAD RESP.
±125 ±250
—
200
—
—
1.4
0
33
±300
300
5
50
150
±200 ±300
60
200
±200 ±300
—
300
1.4
0
50
5
50
250
±250 ±400
60
200
±400 ±500
—
300
1.4
0
120
5
120
600
±350 ±500
60
200
±500 ±600
—
300
1.4
0
150
5
150
750
STEP LINE RESP.
6
START-UP
1
mV pk
Notes
1. Tc = –55°C to +125°C
2. Operation is limited below 17V (see Figure 19).
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.
6. Parameter shall be tested as part of device characterization and after design
and process changes. Thereafter, parameters shall be guaranteed to the
limits specified in the electrical Characteristics table.
2
DC/DC C
ONVERTERS
DUAL OUTPUT MODELS
PARAMETER
OUTPUT VOLTAGE
CONDITIONS
25°C
+V
OUT
–V
OUT
–55°C TO +125°C +V
OUT
–V
OUT
OUTPUT CURRENT
1, 2
OUTPUT POWER
1, 2
OUTPUT RIPPLE
VOLTAGE +/– V
OUT
LINE REGULATION
V
IN
= 17 TO 40VDC
LOAD REGULATION
NO LOAD TO FULL
CROSS REGULATION
EFFECT ON –V
OUT
INPUT VOLTAGE
1
NO LOAD TO FULL
INPUT CURRENT
INPUT RIPPLE
CURRENT
1
EFFICIENCY
LOAD FAULT
6
V
IN
= 17 TO 40 VDC
V
IN
= 17 TO 40 VDC
10 kHz - 2 MHz
25°C
+V
OUT
–V
OUT
+V
OUT
–V
OUT
25°C SEE NOTES 4 & 9
25°C SEE NOTES 5 & 9
CONTINUOUS
TRANSIENT 50 ms
NO LOAD
INHIBITED
10 kHz - 10 MHz
25°C
POWER DISSIPATION
25°C
SHORT CIRCUIT
RECOVERY
9
50 – 100 – 50% BALANCED
TRANSIENT
RECOVERY
7, 9
STEP LINE
9
RESPONSE ± V
OUT
START–UP
1
17 – 40 – 17 V
IN
TRANSIENT
8
RECOVERY
7
DELAY
OVERSHOOT
9
FULL LOAD
NO LOAD
—
—
0
50
50
250
—
—
0
120
120
600
—
—
0
150
FMTR2805D
MIN
TYP
MAX
4.95
5.00
5.05
4.90
4.85
4.80
0
0
—
—
—
—
—
—
—
—
17
0
—
—
—
75
72
—
—
—
—
—
—
—
—
5.00
5.00
5.00
2.5
—
75
—
10
50
5
45
8
5
28
—
35
3
5
77
74
—
—
1.4
±200
100
±200
—
1.4
5.08
5.15
5.18
4.5
25
140
180
50
100
50
120
—
—
40
50
75
8
10
—
—
10
12
5.0
±300
200
±400
300
5
FMTR2812D
MIN
TYP
MAX
11.88 12.00 12.12
11.80
11.64
11.56
0
0
—
—
—
—
—
—
—
—
17
0
—
—
—
78
75
—
—
—
—
—
—
—
—
12.00
12.00
12.00
1.25
—
25
—
10
50
15
45
5
4
28
—
50
3
5
80
77
—
—
1.4
±150
100
±200
—
1.4
12.18
12.36
12.42
2.25
30
80
120
50
150
50
170
—
—
40
50
75
8
10
—
—
10
12
5.0
±300
200
±400
300
5
FMTR SERIES
30 WATT
FMTR2815D
MIN
TYP
MAX
14.85 15.00 15.15
14.76 15.00
14.55
15.00
15.23
15.45
15.53
1.8
30
80
120
50
180
50
190
—
—
40
50
75
8
10
—
—
10
12
5.0
±400
200
±500
300
5
150
750
A
W
mV p-p
mV
UNITS
Electrical Characteristics: -55°C to +125°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
VDC
14.46 15.00
0
0
—
—
—
—
—
—
—
—
17
0
—
—
—
79
76
—
—
—
—
—
—
—
—
1.0
—
40
—
10
50
15
40
3
4
28
—
50
3
5
82
78
—
—
1.4
±200
100
±400
—
1.4
mV
%
VDC
V
mA
mA
mA p-p
%
W
ms
mV pk
µs
mV pk
µs
ms
STEP LOAD
RESPONSE ± V
OUT
mV pk
Notes
1. Tc = –55°C to +125°C.
2. Up to 90% of the total output current/power is available from either output
providing the positive output is carrying at least 10% of the total output
power.
3. Operation is limited below 17 V (see Figure 19).
4. Effect on the negative output under the following conditions:
+P
out
20% to 80%; –P
out
80% to 20%
5. Effect on the negative output under the following conditions:
+P
out
50%; –P
out
10% to 50%
6. Indefinite short circuit protection not guaranteed above 125°C case.
7. Recovery time is measured from application of the transient to point at which
Vout is within 1% of final value.
8. Transition time
≥
10 µs.
9. Parameter shall be tested as part of device characterization and after design
and process changes. Thereafter, parameters shall be guaranteed to the
limits specified in the electrical Characteristics table.
3
FMTR SERIES
30 WATT
8
+VIN
OUTPUT
COMMON
SENSE
RETURN
SENSE
INPUT
COMMON
POSITIVE
OUTPUT
DC/DC C
ONVERTERS
TRIM AND REMOTE SENSE (AVAILABLE ON SINGLE OUTPUT MODELS ONLY)
FMTR SINGLE OUTPUT CONVERTER
8
1
9
12
1
RT
11
7
RL
SENSE
INPUT
COMMON
POSITIVE
OUTPUT
+VIN
OUTPUT
COMMON
SENSE
RETURN
10
2
9
12
2
RL
10
FMTR SINGLE OUTPUT CONVERTER
7
11
EXTERNAL TRIM CONNECTION
1 Make connections at converter.
REMOTE SENSE CONNECTION
2 Make connections at load.
F
IGURE
2: T
RIM
C
ONNECTION1, 2, 3
Trim Formulas
Vout = desired output voltage; Rt = trim resistor
3.3V: Rt = 1300 * Vout – 4304
1.2475
5V: Rt = 1300 * Vout – 6512
1.2475
12V: Rt = 1300 * Vout – 15631
1.2475
15V: Rt = 1300 * Vout – 19498
1.2475
F
IGURE
3: R
EMOTE
S
ENSE2, 3
Notes for Remote Sense and Trim
1. When trimming output voltage and/or remote sensing, the total
output voltage increase must be less than 0.6 volts at the converters
pins to maintain specified performance.
2. If neither voltage trim nor remote sense will be used, connect pin 9
to pin 10 and pin 11 to pin 12 or the output voltage will increase by
1.2 volts
3. CAUTION: The converter will be permanently damaged if the posi-
tive remote sense (pin 12) is shorted to ground. Damage may also
result if the output common or positive output is disconnected from
the load with the remote sense leads connected to the load.
PIN OUT
Angled corner indicates pin one.
Pin
1
2
3
4
5
6
7
8
9
10
11
12
Single Output
Sync
Inhibit/Sync Rtn
Filter Out Rtn
Filter Out
Inhibit
No connection
Input Common
28 V Input
Sense Rtn
Output Common
Positive Output
Positive Sense
Dual Output
Sync
Inhibit/Sync Rtn
Filter Out Rtn
Filter Out
Inhibit
No connection
Input Common
28V Input
No connection
Negative Output
Output Common
Positive Output
1
2
3
4
5
6
12
11
TOP VIEW
FMTR
(Pin side, marked side)
10
9
8
7
See page 7 for dimensions.
F
IGURE
4: P
IN
O
UT
4
DC/DC C
ONVERTERS
MODEL NUMBERING KEY
FMTR SERIES
30 WATT
FMTR
Base Model
28 12
D / ES
Input Voltage
Output Voltage
Number of Outputs
(S = single, D = dual)
Screening
(Standard screening has no designator
in this position.)
Typical Performance Curves: 25°C Tc, 28 VDC Vin, 100% load, free run, unless otherwise specified.
85
16V
80
80
85
16V
82
87
16V
28V
EFFICIENCY (%)
EFFICIENCY (%)
EFFICIENCY (%)
28V
75
28V
75
40V
70
77
40V
72
70
40V
65
65
67
60
5
10
15
20
25
60
62
5
10
15
20
5
10
15
20
25
OUTPUT POWER (Watts)
OUTPUT POWER (Watts)
OUTPUT POWER (Watts)
FMTR2805S EFFICIENCY
FMTR2812S EFFICIENCY
FMTR2815S EFFICIENCY
F
IGURE
5
85
16V
80
28V
85
16V
90
F
IGURE
6
F
IGURE
7
0
10
EFFICIENCY (%)
EFFICIENCY (%)
ATTENUATION (dB)
20
28V
80
20
30
40
50
60
70
80
90
75
70
40V
65
75
40V
70
60
5
10
15
20
65
5
10
15
OUTPUT POWER (Watts)
100
0.1
1
10
100
FMTR2812D EFFICIENCY
OUTPUT POWER (Watts)
FREQUENCY (kHz)
FMTR2815D EFFICIENCY
AUDIO REJECTION, FMTR SERIES
F
IGURE
8
F
IGURE
9
F
IGURE
10
5
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