DVHF+2800T 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 fault tolerant
magnetic feedback circuit. Operating at a nominal
fixed frequency of 325 kHz per stage, 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 15 Watts Output Power
Fault Tolerant 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
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
– DVHF+2800T / DVHF+2800TF DC-DC Converter
(Not
To Scale)
1X006DSJ
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
DVHF+2800T Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load
5
, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
Power Dissipation (Full Load, T
CASE
= +125°C)
Parameter
50 V
DC
80 Volts
15 Watts
6.5 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVHF+28512T
Min
Typ
28
-
3.5
-
40
-
15
-
-
5.0
12.0
-12.0
5.0
12.0
-12.0
-
-
-
-
-
40
60
10
15
5
10
20
-
77
-
-
-
650
750
-
350
Max
50
80
5.0
50
50
1.5
17
14.5
13
5.05
12.12
-11.76
5.15
12.36
-11.52
15
7.5
7.5
1.5
0.44
50
80
20
50
50
50
200
450
-
7.5
7.5
500
700
800
-
-
Min
15
-
-
-
-
0
13
10.5
9
4.95
14.85
-15.30
4.85
14.55
-15.60
0
0
0
0
0
-
-
-
-
-
-
-
-
74
-
-
-
550
700
100
-
+15°C
-65°C to +150°C
270°C
(26 / 29) Grams
Units
Max
50
80
5.0
50
50
1.5
17
14.5
13
5.05
15.15
-14.70
5.15
15.45
-14.40
15
7.5
7.5
1.5
0.35
50
80
20
50
50
50
200
450
-
7.5
7.5
500
700
800
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
V
V
V
V
W
W
W
A
A
mV
p-p
mV
p-p
mV
mV
mV
mV
mV
mV
%
W
W
µF
kHz
kHz
MΩ
kHrs
Conditions
DVHF+28515T
Typ
28
-
3.5
-
40
-
15
-
-
5.0
15.0
-15.0
5.0
15.0
-15.0
-
-
-
-
-
40
60
10
15
5
10
20
-
77
-
-
-
650
750
-
350
STATIC
INPUT
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
4
4
4
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load , 20Hz to 10MHz
5
4
15
-
-
-
-
0
13
10.5
9
Inhibit Pin Open Circuit Voltage
V
MAIN
+V
AUX
OUTPUT
Voltage
-V
AUX
V
MAIN
+V
AUX
-V
AUX
Total
Power
4
4.95
T
CASE
= 25°C
11.88
-12.24
4.85
T
CASE
= -55°C to +125°C
11.64
-12.48
0
0
0
0
Either Output
5
6
V
MAIN
±V
AUX
6
Current
3
V
MAIN
±V
AUX
V
MAIN
±V
AUX
V
MAIN
±V
AUX
V
MAIN
+V
AUX
-V
AUX
0
-
-
-
-
-
5,8
Ripple Voltage
Line Regulation
Full Load , 20Hz to 10MHz
V
IN
= 15V to 50V
Load Regulation
No Load to Full Load
-
-
Cross Regulation
EFFICIENCY
±V
AUX
+V
OUT
= 30%, -V
OUT
= 70%
+V
OUT
= 70%, -V
OUT
= 30%
Full Load
Overload
5
4
-
74
-
-
-
550
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
4
Short Circuit
SWITCHING FREQUENCY
SYNCHRONIZATION FREQUENCY
ISOLATION
MTBF (MIL-HDBK-217F)
7
700
500 V
DC
, T
CASE
= 25°C
AIF @ T
C
= 55°C
100
-
1X006DSJ
2
DVHF+2800T Series
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load
5
, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
Input Voltage (Transient, 1 second)
Output Power
Power Dissipation (Full Load, T
CASE
= +125°C)
50 V
DC
80 Volts
15 Watts
6.5 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVHF+28512T
Min
Typ
Max
Min
+15°C
-65°C to +150°C
270°C
(26 / 29) Grams
Parameter
Conditions
DVHF+28515T
Typ
Max
Units
DYNAMIC
Load Step Output Transient
Load Step Recovery
2
V
MAIN
±V
AUX
V
MAIN
±V
AUX
V
MAIN
±V
AUX
V
MAIN
±V
AUX
V
MAIN
±V
AUX
V
IN
= 0V to 28V
V
IN
= 15V to 50V
Half Load to Full Load
-
-
-
-
-
-
-
-
-
-
-
200
400
450
300
50
150
100
100
-
-
-
400
500
650
350
150
250
200
200
17
25
50
-
-
-
-
-
-
-
-
-
-
-
200
400
450
300
50
150
100
100
-
-
-
400
500
650
350
150
250
200
200
17
25
50
mV
PK
mV
PK
µSec
µSec
mV
PK
mV
PK
µSec
µSec
mSec
mV
PK
mV
PK
Line Step Output Transient
Line Step Recovery
Turn On Delay
Turn On Overshoot
2, 4
4
Notes:
1.
2.
3.
4.
5.
6.
7.
8.
This note intentionally not used.
Time for output voltage to settle within 1% of its nominal value.
Derate linearly to 0 at 135°C.
Verified by qualification testing.
7.5W on V
MAIN
and 7.5W on ±V
AUX
.
Up to 70% of the total auxiliary power or current can be drawn from either of the auxiliary outputs.
Synchronization is TTL signal with V
SYNC MAX
= 6V.
-V
AUX
is 5% Load to Full Load at -55°C.
1X006DSJ
3
DVHF+2800T Series
BLOCK DIAGRAM
28V IN
PIN 9
+V MAIN
PIN 2
OUT COM
PIN 3
IN COM
PIN 8
SYNC
PIN 7
PRIMARY
HOUSEKEEPING
SUPPLY
DUAL PWM
CONTROLLER
+V AUX
PIN 4
-V AUX
PIN 5
TRANSFORMER
ISOLATED
ERROR SIGNAL
FEEDBACK
VOLTAGE
ERROR
AMPLIFIERS
INH
PIN 1
TRANSFORMER
ISOLATED
POWER
FEEDFORWARD
SECONDARY
HOUSKEEPING
SUPPLY
Figure 2
1X006DSJ
4
DVHF+2800T Series
CONNECTION DIAGRAM
9
28V IN
7
SYNC
28 Vdc
+V AUX
LOAD
1
INH
8
IN COM OUT COM
3
Figure 3
2
+V MAIN
LOAD
4
+
-
5
-V AUX
LOAD
INHIBIT DRIVE CONNECTION DIAGRAMS
28V IN 9
15K
INH
1
BIAS
OPTIONAL
CAPACITOR
IN COM 8
14V
OPTOISOLATOR
28V IN 9
15K
INH
1
BIAS
OPTIONAL
CAPACITOR
IN COM 8
14V
Figure 4
– Internal Inhibit Circuit and Recommended Drive
(Shown with optional capacitor for turn-on delay)
Figure 5
– Isolated Inhibit Drive
(Shown with optional capacitor for turn-on delay)
1X006DSJ
5
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