FMTR SERIES
30 WATT
DC/DC CONVERTERS
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)
ABSOLUTE MAXIMUM RATINGS
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
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
• 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
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
Open collector
EMI FILTER
Noise Rejection - Minimum
Input Filter DC Resistance
• 0.2 ohms max
500 kHz
1 MHz
5 MHz
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
FMTR283R3S
FMTR2805S
FMTR2812S
FMTR2815S
PARAMETER
CONDITION
MIN TYP MAX MIN TYP MAX MIN TYP MAX MIN TYP MAX
3.26 3.30 3.34 4.95 5.00 5.05 11.88 12.00 12.12 14.85 15.00 15.15
3.20 3.30 3.40 4.85 5.00 5.15 11.64 12.00 12.36 14.55 15.00 15.45
UNITS
OUTPUT VOLTAGE
25°C
VDC
–55°C TO +125°C
1
OUTPUT CURRENT
V
= 17 to 40 VDC
= 17 to 40 VDC
0
0
––
—
6.06
20
0
0
—
—
5.0
25
0
0
—
—
2.5
30
0
0
—
—
2.0
30
A
IN
IN
1
OUTPUT POWER
V
W
OUTPUT RIPPLE
VOLTAGE
25°C
—
—
—
70
—
—
140
180
10
—
—
—
110 220
—
—
—
60
—
15
120
160
50
—
—
—
25
—
15
50
90
50
10 kHz – 2 MHz
mV p-p
mV
—
260
50
2
LINE REGULATION
V
= 17 to 40 VDC
15
IN
LOAD REGULATION
NO LOAD TO FULL
NO LOAD TO FULL
—
—
10
40
—
15
28
50
40
—
15
28
50
40
—
15
28
50
40
mV
1
INPUT VOLTAGE
17
28
17
17
17
VDC
1
INPUT CURRENT
NO LOAD
INHIBITED
—
—
30
7
75
8
—
—
35
3
75
8
—
—
35
3
75
8
—
—
35
3
75
8
mA
mA
INPUT RIPPLE
CURRENT
10 kHz – 10 MHz
—
5
10
—
—
—
75
72
5
10
—
—
—
79
76
5
10
—
—
—
80
77
5
10
mA p-p
%
EFFICIENCY
25°C 73
75
72
77
74
82
78
83
79
—
INCLUDES FILTER
70
3
LOAD FAULT
POWER DISSIPATION
SHORT CIRCUIT 25°C
–55°C TO +125°C
—
—
—
—
—
10
12
6
—
—
—
—
—
10
12
5
—
—
—
—
—
10
12
5
—
—
—
—
—
10
12
5
W
4, 6
RECOVERY
1.4
1.4
1.4
1.4
ms
STEP LOAD RESP.
50% – 100% – 50%
TRANSIENT
—
—
125
250
200
—
—
200 300
60 200
—
—
250 400
60 200
—
—
350 500
60 200
mV pk
µs
4, 6
RECOVERY
—
6
STEP LINE RESP.
17 – 40 – 17 VDC
5
TRANSIENT
—
—
—
—
300
300
—
—
200 300
—
—
400 500
—
—
500 600
mV pk
µs
4
RECOVERY
—
300
5
—
300
5
—
300
5
1
START-UP
DELAY
—
1.4
5
—
1.4
—
1.4
—
1.4
ms
6
OVERSHOOT
FULL LOAD
NO LOAD
—
—
0
50
—
—
0
50
—
—
0
120
—
—
0
150
mV pk
33
150
50
250
120 600
150 750
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
CRANE [ Crane Aerospace & Electronics. ]
