DVHF2800S Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVHF 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 DVHF series is a magnetic feedback circuit
that is radiation immune. Operating at a nominal
fixed frequency of 450 kHz, these regulated, isolated
units utilize well controlled undervoltage lockout
circuitry to eliminate slow start-up problems.
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
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High Reliability
Very Low Output Noise
Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704
Up to 20 Watts Output Power
Radiation Immune Magnetic Feedback Circuit
NO Use of Optoisolators
Undervoltage Lockout
Indefinite Short Circuit Protection
Current Limit Protection
Industry Standard Pinout
High Input Transient Voltage: 80 Volts for 1 sec
per MIL-STD-704A
Radiation Hardened Version Available
Precision Projection Welded Hermetic Package
High Power Density: > 37 W/in
3
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVMH28 EMI
Filter
Flanged and Non-flanged Versions Available.
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVHF2800S / DVHF2800SF DC-DC Converter
(Not
To Scale)
1X004DSG
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
1
DVHF2800S 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)
50 V
DC
80 Volts
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
DVHF283R3S
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
DVHF2805S
Max
50
80
6
65
80
1.5
13.0
14.8
14.5
3.333
3.35
10
3.0
40
20
50
-
8
8
1000
500
-
-
Units
Max
50
80
6
65
80
1.5
13.0
14.8
14.5
5.05
5.075
15
3.0
40
20
50
-
8
8
1000
500
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
40
-
-
11.0
-
-
3.30
3.30
-
-
-
-
-
-
-
-
-
450
-
427
Min
15
-
-
-
-
0
9.0
12.0
11.0
4.95
4.925
0
0
-
-
-
72
-
-
-
350
100
-
Typ
28
-
-
40
-
-
11.0
-
-
5.00
5.00
-
-
-
-
-
-
-
-
-
450
-
427
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9.0
12.0
11.0
Inhibit Pin Open Circuit Voltage
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
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Overload
4
-
-
-
65
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
AIF @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
-
-
400
300
10
0
400
500
700
500
20
15
-
-
-
-
-
-
-
-
400
300
10
0
600
600
800
700
20
25
mV
PK
µSec
mV
PK
µSec
mSec
mV
PK
Line Step Output Transient
2, 4
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.
1X004DSG
2
DVHF2800S 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)
50 V
DC
80 Volts
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
DVHF2812S
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
DVHF2815S
Max
50
80
6
65
80
1.5
13.0
14.8
14.5
12.12
12.18
20
1.67
40
20
50
-
8
8
500
500
-
-
Units
Max
50
80
6
65
80
1.5
13.0
14.8
14.5
15.15
15.225
20
1.34
40
20
50
-
8
8
500
500
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
40
-
-
11.0
-
-
12.0
12.0
-
-
-
-
-
-
-
-
-
450
-
427
Min
15
-
-
-
-
0
9.0
12.0
11.0
14.85
14.775
0
0
-
-
-
78
-
-
-
350
100
-
Typ
28
-
-
40
-
-
11.0
-
-
15.0
15.0
-
-
-
-
-
-
-
-
-
450
-
427
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9.0
12.0
11.0
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
11.88
11.82
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Overload
4
-
-
-
77
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
AIF @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
-
-
500
300
10
0
500
500
900
500
20
50
-
-
-
-
-
-
-
-
500
300
10
0
500
500
900
500
20
50
mV
PK
µSec
mV
PK
µSec
mSec
mV
PK
Line Step Output Transient
2, 4
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.
1X004DSG
3
DVHF2800S 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)
50 V
DC
80 Volts
20 Watts
6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight
(Maximum)
(Un-Flanged / Flanged)
DVHF285R2S
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
+12°C
-65°C to +150°C
270°C
(24 / 27)
Grams
Parameter
Conditions
DVHF281R9S
Max
50
80
6
65
80
1.5
13.0
14.8
14.5
5.252
5.278
15
3.0
40
20
50
-
8
8
1000
500
-
-
Units
Max
50
80
6
65
80
1.5
13.0
14.8
14.5
1.93
1.94
8
4.0
40
20
50
-
8
8
1000
500
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
40
-
-
11.0
-
-
5.20
5.20
-
-
-
-
-
-
-
-
-
450
-
427
Min
15
-
-
-
-
0
9.0
12.0
11.0
1.87
1.86
0
0
-
-
-
59
-
-
-
350
100
-
Typ
28
-
-
40
-
-
11.0
-
-
1.90
1.90
-
-
-
-
-
-
-
-
-
450
-
427
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
15
-
-
-
-
0
9.0
12.0
11.0
Inhibit Pin Open Circuit Voltage
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
5.148
5.122
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
Full Load, 20Hz to 10MHz
V
IN
= 15V to 50V
No Load to Full Load
Overload
4
-
-
-
72
-
-
-
350
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
SWITCHING FREQUENCY
500 V
DC
AIF @ T
C
= 55°C
V
OUT
V
OUT
V
OUT
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
-
-
400
300
10
0
600
600
800
700
20
25
-
-
-
-
-
-
-
-
100
200
10
0
250
600
400
700
20
15
mV
PK
µSec
mV
PK
µSec
mSec
mV
PK
Line Step Output Transient
2, 4
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.
1X004DSG
4
DVHF2800S Series
BLOCK DIAGRAM
PIN 8
28V IN
L1
C1
IN COM
PIN 7
Q1
MAGNETIC
FEEDBACK
Rs1
VOLTAGE AND
CURRENT
AMPLIFIERS
C2
Rs2
OUT COM
PIN 3
D1
PIN 4
+V OUT
T1
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 1
PWM
CONTROL
SECONDARY
HOUSEKEEPING
SUPPLY
Figure 2
CONNECTION DIAGRAM
8
28V IN
+V OUT
4
LOAD
28 Vdc
+
-
1
INH
OUT COM
3
7
IN COM
Figure 3
1X004DSG
5
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