DVHE2800S Series
PRELIMINARY
DESCRIPTION
The DVHE series of high reliability DC-DC
converters is operable over the full military (-55 °C to
+125 °C) temperature range with no power derating.
Operating at a nominal fixed frequency of 260 kHz,
these regulated, isolated units utilize well controlled
undervoltage lockout circuitry to eliminate slow start-
up problems.
The DVHE is optimized for low voltage applications
with high efficiency synchronous rectification and fast
transient response.
These converters are designed and manufactured in
a facility qualified to ISO9001 and certified to MIL-
PRF-38534 and MIL-STD-883.
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
FEATURES
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High Efficiency, Up to 91%
Low Output Voltage Models
Up to 50 Watts Output Power
Up to 10 Amps Output Current
High Reliability
Very Low Output Noise
Wide Input Voltage Range: 16 to 40 Volts
Input Transient Voltage: 50 Volts for 1 sec
Output Voltage Trim +/-10%
NO Use of Optoisolators
Undervoltage Lockout
Short Circuit / Current Limit Protection
High Power Density: > 50 W/in
3
Industry Standard Pinout
Precision Seam Seal or Solder Seal Hermetic
Package
Flanged and Non-flanged Versions Available.
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVMC28 EMI
Filter
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVHE2800S DC-DC Converter
(Not
To Scale)
12055DSPR1
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: sales@vpt-inc.com
1
DVHE2800S 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
50 Watts
8 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
DVHE281R9S
Min
16
-
-
+10°C
-65°C to +150°C
270°C
(49 / 52) Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
Conditions
DVHE282R5S
Max
40
50
6
90
50
Typ
28
-
-
Min
16
-
-
Typ
28
-
-
Max
40
50
6
90
60
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
V
V
mA
mA
mA
p-p
V
V
V
V
V
V
W
A
mV
p-p
mV
mV
0
7
14
13
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
80
Overload
4
-
9
15
14
1.90
1.9
1.5
11
15.8
15
1.92
1.96
24.7
13
35
0
7
14
13
2.47
2.42
0
0
-
9
15
14
2.50
2.50
1.5
11
15.8
15
2.53
2.58
25
10
60
Inhibit Pin Open Circuit Voltage
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
1.88
1.84
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
1
15
84
10
30
82
10
12
5000
86
10
10
5000
100
-
-
413
-
-
%
W
W
µF
kHz
MΩ
kHrs
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
220
500 V
DC
AIF @ T
C
= 55°C
100
-
260
-
413
SWITCHING FREQUENCY
300
-
-
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
2
4
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
-
-
-
-
-
-
150
200
70
200
-
-
250
300
100
300
30
40
-
-
-
-
-
-
175
200
150
150
-
-
250
300
200
200
30
40
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.
12055DSPR1
2
DVHE2800S 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
50 Watts
8 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum) (Un-Flanged / Flanged)
+10°C
-65°C to +150°C
270°C
(49 / 52) Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
UVLO Turn Off
OUTPUT
Voltage
Power
3
3
4
4
4
Conditions
DVHE283R3S
Min
16
-
-
DVHE2805S
Max
40
50
6
90
60
Typ
28
-
-
Min
16
-
-
-
-
0
7
14
13
4.95
4.85
0
0
-
-
-
87
-
-
-
220
100
-
Typ
28
-
-
-
-
-
9
15
14
5.00
5.00
-
-
70
1
15
90
-
-
-
260
-
413
Max
40
50
6
90
115
1.5
11
15.8
15
5.05
5.15
50
10
100
10
30
12
12
5000
300
-
-
Units
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
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
0
7
14
13
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
V
OUT
Full Load, 20Hz to 10MHz
V
IN
= 16V to 40V
No Load to Full Load
85
Overload
4
-
9
15
14
3.30
3.30
1.5
11
15.8
15
3.33
3.40
33
10
Inhibit Pin Open Circuit Voltage
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
3.26
3.20
0
0
Current
Ripple Voltage
Line Regulation
Load Regulation
EFFICIENCY
50
1
15
88
60
10
30
10
10
5000
LOAD FAULT POWER DISSIPATION
CAPACITIVE LOAD
ISOLATION
MTBF (MIL-HDBK-217F)
4
Short Circuit
220
500 V
DC
AIF @ T
C
= 55°C
100
260
-
413
SWITCHING FREQUENCY
300
-
-
-
-
-
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
2
4
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 16V to 40V
V
IN
= 0V to 28V
200
120
150
140
-
-
300
200
200
200
30
40
-
-
-
-
-
-
250
200
220
180
-
-
400
300
300
250
20
40
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.
12055DSPR1
3
DVHE2800S Series
BLOCK DIAGRAM
PIN 1
28V IN
Gate Drive
Q2
PIN 4
OUT COM
PIN 10
Q1
Q3
T2
T1
PIN 5
+V OUT
IN COM
UNDER
VOLTAGE
SHUTDOWN
MAGNETIC
FEEDBACK
PWM
CONTROL
VOLTAGE AND
CURRENT
AMPLIFIERS
PIN 9
PIN 6
PIN 3
TRIM
+S
-S
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 2
SECONDARY
HOUSEKEEPING
SUPPLY
Figure 2
CONNECTION DIAGRAM
1
28V IN
+V OUT
6
+S
28 Vdc
5
+
-
2
INH
Trim
9
3
-S
LOAD
10
IN COM
OUT COM
4
Figure 3
12055DSPR1
4
DVHE2800S Series
INHIBIT DRIVE CONNECTION DIAGRAMS
28V IN
1
10K
INH
2
BIAS
OPTOISOLATOR
INH
2
28V IN
1
10K
BIAS
OPTIONAL
CAPACITOR
IN COM
10
9V
OPTIONAL
CAPACITOR
IN COM
10
9V
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)
EMI FILTER HOOKUP DIAGRAM
DVMC28 EMI FILTER
1
28V IN
28V OUT
2
1
DVHE2800S DC-DC CONVERTER
28V IN
+V OUT
+S
28 Vdc
5
6
9
3
4
LOAD
+
-
2
INH
Trim
-S
5
IN COM
OUT COM
3
4
10
IN COM
OUT COM
7, 8
CASE
Figure 6
– Converter with EMI Filter
12055DSPR1
5
