DVHF2800S Series
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
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
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)
DVHF2800S Series
1X004DSG
2
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+12C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
1
20 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
6 Watts
Weight (Maximum) (Un-Flanged / Flanged)
(24 / 27) Grams
DVHF283R3S DVHF2805S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous
15 28 50 15 28 50 V
INPUT
Voltage
4
Transient,
1
sec
- - 80 - - 80 V
Inhibited
- - 6 - - 6
mA
Current
No
Load
- 40 65 - 40 65
mA
Ripple Current
Full Load, 20Hz to 10MHz
-
-
80
-
-
80
mA
p-p
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
9.0 11.0 13.0 9.0 11.0 13.0 V
UVLO Turn On
12.0
-
14.8
12.0
-
14.8
V
UVLO Turn Off
4
11.0 - 14.5
11.0 - 14.5 V
V
OUT
T
CASE
=
25C
3.267 3.30 3.333 4.95 5.00 5.05 V
OUTPUT
Voltage
V
OUT
T
CASE
=
-55C
to
+125C 3.25 3.30 3.35 4.925 5.00 5.075 V
Power
3
0 - 10 0 - 15
W
Current
3
V
OUT
0 - 3.0 0 - 3.0
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
40
-
-
40
mV
p-p
Line Regulation
V
OUT
V
IN
= 15V to 50V
-
-
20
-
-
20
mV
Load Regulation
V
OUT
No Load to Full Load
-
-
50
-
-
50
mV
EFFICIENCY
65 - - 72 - - %
Overload
4
- - 8 - - 8 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 8 - - 8 W
CAPACITIVE LOAD
4
- - 1000 - - 1000
F
SWITCHING
FREQUENCY
350 450 500 350 450 500 kHz
ISOLATION 500
V
DC
100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55C
- 427 - - 427 - kHrs
DYNAMIC
Load Step Output Transient
V
OUT
- - 400 - - 600
mV
PK
Load Step Recovery
2
Half Load to Full Load
- - 500 - - 600
Sec
Line Step Output Transient
4
V
OUT
- 400
700 - 400
800
mV
PK
Line Step Recovery
2, 4
V
IN
= 16V to 40V
- 300
500 - 300
700
Sec
Turn On Delay
V
OUT
- 10 20 - 10 20
mSec
Turn On Overshoot
V
IN
= 0V to 28V
- 0 15 - 0 25
mV
PK
Notes: 1. Dependant on output voltage.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135C.
4. Verified by qualification testing.
DVHF2800S Series
1X004DSG
3
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+12C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
1
20 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
6 Watts
Weight (Maximum) (Un-Flanged / Flanged)
(24 / 27) Grams
DVHF2812S DVHF2815S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous
15 28 50 15 28 50 V
INPUT
Voltage
4
Transient,
1
sec
- - 80 - - 80 V
Inhibited
- - 6 - - 6
mA
Current
No
Load
- 40 65 - 40 65
mA
Ripple Current
Full Load, 20Hz to 10MHz
-
-
80
-
-
80
mA
p-p
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
9.0 11.0 13.0 9.0 11.0 13.0 V
UVLO Turn On
12.0
-
14.8
12.0
-
14.8
V
UVLO Turn Off
4
11.0 - 14.5
11.0 - 14.5 V
V
OUT
T
CASE
=
25C
11.88 12.0 12.12 14.85 15.0 15.15 V
OUTPUT
Voltage
V
OUT
T
CASE
= -55C to +125C
11.82
12.0
12.18
14.775
15.0
15.225
V
Power
3
0 - 20 0 - 20
W
Current
3
V
OUT
0 -
1.67
0 -
1.34
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
40
-
-
40
mV
p-p
Line Regulation
V
OUT
V
IN
= 15V to 50V
-
-
20
-
-
20
mV
Load Regulation
V
OUT
No Load to Full Load
-
-
50
-
-
50
mV
EFFICIENCY
77 - - 78 - - %
Overload
4
- - 8 - - 8 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 8 - - 8 W
CAPACITIVE LOAD
4
- - 500 - - 500
F
SWITCHING
FREQUENCY
350 450 500 350 450 500 kHz
ISOLATION 500
V
DC
100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55C
- 427 - - 427 - kHrs
DYNAMIC
Load Step Output Transient
V
OUT
- - 500 - - 500
mV
PK
Load Step Recovery
2
Half Load to Full Load
- - 500 - - 500
Sec
Line Step Output Transient
4
V
OUT
- 500
900 - 500
900
mV
PK
Line Step Recovery
2, 4
V
IN
= 16V to 40V
- 300
500 - 300
500
Sec
Turn On Delay
V
OUT
- 10 20 - 10 20
mSec
Turn On Overshoot
V
IN
= 0V to 28V
- 0 50 - 0 50
mV
PK
Notes: 1. Dependant on output voltage.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135C.
4. Verified by qualification testing.
DVHF2800S Series
1X004DSG
4
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+12C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
1
20 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
6 Watts
Weight (Maximum) (Un-Flanged / Flanged)
(24 / 27) Grams
DVHF285R2S DVHF281R9S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous
15 28 50 15 28 50 V
INPUT
Voltage
4
Transient,
1
sec
- - 80 - - 80 V
Inhibited
- - 6 - - 6
mA
Current
No
Load
- 40 65 - 40 65
mA
Ripple Current
Full Load, 20Hz to 10MHz
-
-
80
-
-
80
mA
p-p
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
9.0 11.0 13.0 9.0 11.0 13.0 V
UVLO Turn On
12.0
-
14.8
12.0
-
14.8
V
UVLO Turn Off
4
11.0 - 14.5
11.0 - 14.5 V
V
OUT
T
CASE
=
25C
5.148 5.20 5.252 1.87 1.90 1.93 V
OUTPUT
Voltage
V
OUT
T
CASE
=
-55C
to
+125C 5.122 5.20 5.278 1.86 1.90 1.94 V
Power
3
0 - 15 0 - 8 W
Current
3
V
OUT
0 - 3.0 0 - 4.0
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
40
-
-
40
mV
p-p
Line Regulation
V
OUT
V
IN
= 15V to 50V
-
-
20
-
-
20
mV
Load Regulation
V
OUT
No Load to Full Load
-
-
50
-
-
50
mV
EFFICIENCY
72 - - 59 - - %
Overload
4
- - 8 - - 8 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 8 - - 8 W
CAPACITIVE LOAD
4
- - 1000 - - 1000
F
SWITCHING
FREQUENCY
350 450 500 350 450 500 kHz
ISOLATION 500
V
DC
100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55C
- 427 - - 427 - kHrs
DYNAMIC
Load Step Output Transient
V
OUT
- - 600 - - 250
mV
PK
Load Step Recovery
2
Half Load to Full Load
- - 600 - - 600
Sec
Line Step Output Transient
4
V
OUT
- 400
800 - 100
400
mV
PK
Line Step Recovery
2, 4
V
IN
= 16V to 40V
- 300
700 - 200
700
Sec
Turn On Delay
V
OUT
- 10 20 - 10 20
mSec
Turn On Overshoot
V
IN
= 0V to 28V
- 0 25 - 0 15
mV
PK
Notes: 1. Dependant on output voltage.
2. Time for output voltage to settle within 1% of its nominal value.
3. Derate linearly to 0 at 135C.
4. Verified by qualification testing.
DVHF2800S Series
1X004DSG
5
BLOCK DIAGRAM
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
VOLTAGE AND
CURRENT
AMPLIFIERS
SECONDARY
HOUSEKEEPING
SUPPLY
PIN 8
28V IN
PIN 7
IN COM
L1
C1
Q1
Rs1
T1
D1
C2
Rs2
+V OUT
PIN 4
PIN 3
OUT COM
INH
PIN 1
FEEDBACK
MAGNETIC
Figure 2
CONNECTION DIAGRAM
7
IN COM
1
INH
8
28V IN
4
+V OUT
3
OUT COM
LOAD
+
-
28 Vdc
Figure 3
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