DVFL2800S Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVFL series of high reliability DC-DC converters
is operable over the full military (-55 °C to +125 °C)
temperature range with no power derating. Unique
to the DVFL series are robust and effective input and
output filters which provide dramatically reduced
input and output noise performance when compared
to other manufacturers competing devices.
Operating at a nominal fixed frequency of 500 kHz,
these regulated, isolated units utilize a high speed
magnetic feedback design and well controlled
undervoltage lockout circuitry to eliminate slow start-
up problems. The current sharing function allows a
maximum of five units to be connected in parallel to
boost the total output power to 5 times. The output
voltage is trimmable up to +10% or down –20%.
These converters are designed and manufactured in
a facility qualified to ISO9001 and certified to MIL-
PRF-38534 and MIL-STD-883.
This product may incorporate one or more of the
following U.S. patents:
5,784,266
5,790,389
5,963,438
5,999,433
6,005,780
6,084,792
6,118,673
FEATURES
High Reliability
Parallel Up to 5 Units With Current Sharing
Output Voltage Trim Up +10% or Down –20%
Wide Input Voltage Range: 16 to 40 Volts per
MIL-STD-704
Up to 120 Watts Output Power
Fault Tolerant Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Indefinite Short Circuit Protection
Current Limit Protection
Industry Standard Pinout
Input Transient Voltage: 50 Volts for 1 second
Precision Seam Welded Hermetic Package
High Power Density: > 80 W/in
3
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVME28 EMI
Filter
MIL-PRF-38534 Element Evaluated
Components
Space Applications should consider VPT’s “S”
Series of Radiation Tolerant Power Conversion
Devices. Contact VPT for details.
Figure 1
– DVFL2800S DC-DC Converter
(Exact
marking may differ from that shown)
11314 4th Avenue
West, Suite 206
Everett, WA 98204
http://www.vpt-inc.com
Sales Information:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
DS1X010R
1
DVFL2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +125°C)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
DVFL283R3S
Min
16
-
-
-
-
-
0
0
4
4
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
STATIC
INPUT
4
Voltage
Conditions
DVFL2805S
Max
40
50
6
70
120
80
1.5
1
15
12
16
15.5
3.333
3.35
66
20
80
20
80
10
4
-
50
50
1000
600
600
-
-
Typ
28
-
1
40
60
25
-
-
-
-
-
-
3.30
3.30
-
-
15
2
2
-
-
72
-
-
-
500
-
-
400
Min
16
-
-
-
-
-
0
0
10.5
4
14.5
13.5
4.95
4.925
0
-
-
-
-
-20
2
75
-
-
-
425
500
100
-
Typ
28
-
1
40
65
35
-
-
-
-
-
-
5.00
5.00
-
-
15
2
2
-
-
78
-
-
-
500
-
-
400
Max
40
50
6
70
120
80
1.5
1
15
12
16
15.5
5.05
5.075
100
20
80
20
100
10
4
-
50
50
1000
600
600
-
-
Units
Continuous
Transient, 1 sec
Inhibited 1
Inhibited 2
No Load
Full Load, 20Hz to 10MHz
4
4
V
V
mA
mA
mA
mA
p-p
V
V
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
V
%
W
W
F
kHz
kHz
MΩ
kHrs
Current
Ripple Current
INH1 Pin Input
INH2 Pin Input
INH1 Pin Open Circuit Voltage
INH2 Pin Open Circuit Voltage
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
Current
Ripple Voltage
Line Regulation
Load Regulation
Voltage Trim
EFFICIENCY
4
4
4
10.5
4
14.5
13.5
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
3.267
3.25
0
-
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
Full Load
-
-
-
-10
2
68
Share Pin Voltage
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
425
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
– V
L
= 5V
Duty Cycle = 20% - 80%
500 V
DC
AIF @ T
C
= 55°C
500
100
-
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS1X010R
2
DVFL2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +125°C)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
DVFL283R3S
Min
-
-
-
-
-
-
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 135°C.
2
4
Conditions
DVFL2805S
Max
400
500
600
500
20
15
Typ
140
260
300
300
5
0
Min
-
-
-
-
-
-
Typ
160
260
300
300
5
0
Max
400
500
600
500
20
25
Units
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
2, 4
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS1X010R
3
DVFL2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +125°C)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
DVFL286R3S
Min
16
-
-
-
-
-
0
0
4
4
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
STATIC
INPUT
4
Voltage
Conditions
DVFL2807S
Max
40
50
6
70
120
80
1.5
1
15
12
16
15.5
6.363
6.395
100
15.9
80
20
100
10
4
-
50
50
1000
600
600
-
-
Typ
28
-
1
40
65
35
-
-
-
-
-
-
6.3
6.3
-
-
15
2
2
-
-
79
-
-
-
500
-
-
400
Min
16
-
-
-
-
-
0
0
10.5
4
14.5
13.5
6.93
6.895
-
-
-
-
-
-20
2
74
-
-
-
425
500
100
-
Typ
28
-
1
40
65
35
-
-
-
-
-
-
7
7
-
-
15
2
2
-
-
80
-
-
-
500
-
-
400
Max
40
50
6
70
120
80
1.5
1
15
12
16
15.5
7.07
7.105
100
14.3
80
20
100
10
4
-
50
50
1000
600
600
-
-
Units
Continuous
Transient, 1 sec
Inhibited 1
Inhibited 2
No Load
Full Load, 20Hz to 10MHz
4
4
V
V
mA
mA
mA
mA
p-p
V
V
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
V
%
W
W
F
kHz
kHz
MΩ
kHrs
Current
Ripple Current
INH1 Pin Input
INH2 Pin Input
INH1 Pin Open Circuit Voltage
INH2 Pin Open Circuit Voltage
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
Current
Ripple Voltage
Line Regulation
Load Regulation
Voltage Trim
EFFICIENCY
4
4
4
10.5
4
14.5
13.5
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
6.237
6.205
-
-
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
Full Load
-
-
-
-20
2
74
Share Pin Voltage
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Overload
4
-
-
-
425
Short Circuit
SWITCHING FREQUENCY
SYNC FREQUENCY RANGE
ISOLATION
MTBF (MIL-HDBK-217F)
V
H
– V
L
= 5V
Duty Cycle = 20% - 80%
500 V
DC
AIF @ T
C
= 55°C
500
100
-
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 135°C.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS1X010R
4
DVFL2800S Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
1
Power Dissipation (Full Load, T
CASE
= +125°C)
40 V
DC
50 Volts
120 Watts
41 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (No Pin Extensions)
DVFL286R3S
Min
-
-
4
+15°C
-65°C to +150°C
270°C
86 Grams
Parameter
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
Notes:
1. Dependant on output voltage.
3. Derate linearly to 0 at 135°C.
2
Conditions
DVFL2807S
Max
300
350
300
300
20
25
-
-
-
Typ
150
200
150
150
5
0
Max
-
Typ
150
200
150
200
5
0
Max
300
350
300
400
20
25
Units
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
mV
PK
Sec
mV
PK
Sec
mSec
mV
PK
Line Step Output Transient
2, 4
-
-
-
-
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
DS1X010R
5
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