DVCH2800D Series
HIGH RELIABILITY HYBRID
DC-DC CONVERTERS
DESCRIPTION
The DVCH 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 DVCH series is a magnetic feedback
circuit that is radiation immune. Operating at a
nominal fixed frequency of 400 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: 12 to 50 Volts per
MIL-STD-704
Up to 1.5 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
Precision Projection Welded Hermetic Package
High Power Density: > 7 W/in
3
Custom Versions Available
Additional Environmental Screening Available
Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements When Used With a DVMSA28
EMI Filter
MIL-PRF-38534 Element Evaluated
Components
Figure 1
– DVCH2800D DC-DC Converter
(Not
To Scale)
1X052DSB
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
DVCH2800D 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
1.5 Watts
0.6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
DVCH2805D
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
OUTPUT
Voltage
Power
3
4
4
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
Conditions
DVCH2812D
Max
50
80
3.5
10
30
1.5
11.0
11.5
5.05
5.20
1.5
1.2
0.24
50
150
400
250
-
3
4
500
475
-
-
Units
Max
50
80
3.5
12
30
1.5
11.0
11.5
12.12
12.48
1.5
1.2
.1
100
150
700
250
-
3
4.5
200
475
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
-
-
-
9.0
-
5.00
5.00
-
-
-
-
-
-
-
79
-
-
-
400
-
841
Min
12
-
-
-
-
0
8.0
6.5
11.88
11.52
0
0
0
-
-
-
-
74
-
-
-
325
100
-
Typ
28
-
-
-
-
-
9.0
-
12.0
12.0
-
-
-
-
-
-
-
79
-
-
-
400
-
841
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
12
-
-
-
-
0
8.0
6.5
Inhibit Pin Open Circuit Voltage
±V
OUT
±V
OUT
Total
±V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
Either Output
Either Output
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
4.95
4.80
0
0
0
-
-
-
-
72
-
-
-
325
Current
3
I
OUT
±V
OUT
±V
OUT
±V
OUT
±V
OUT
Ripple Voltage
Line Regulation
Load Regulation
Load Regulation
EFFICIENCY
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
= 12V to 50V
V
IN
= 0V to 28V
-
-
-
-
-
-
100
200
200
400
15
0
300
500
400
600
20
25
-
-
-
-
-
-
100
100
300
300
15
0
300
400
600
600
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.
1X052DSB
2
DVCH2800D 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
1.5 Watts
0.6 Watts
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
DVCH2815D
Min
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
OUTPUT
Voltage
Power
3
4
4
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
Conditions
Units
Max
50
80
3.5
14
30
1.5
11.0
11.5
15.15
15.60
1.5
1.2
0.08
100
150
700
250
-
3
4.5
200
475
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
W
A
mV
p-p
mV
mV
mV
%
W
W
µF
kHz
MΩ
kHrs
Typ
28
-
-
-
-
-
9.0
-
15.0
15.0
-
-
-
-
-
-
-
79
-
-
-
400
-
841
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
12
-
-
-
-
0
8.0
6.5
Inhibit Pin Open Circuit Voltage
±V
OUT
±V
OUT
Total
±V
OUT
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
Either Output
Either Output
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
14.85
14.40
0
0
0
-
-
-
-
74
-
-
-
325
Current
3
I
OUT
±V
OUT
±V
OUT
±V
OUT
±V
OUT
Ripple Voltage
Line Regulation
Load Regulation
Load Regulation
EFFICIENCY
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
= 12V to 50V
V
IN
= 0V to 28V
-
-
-
-
-
-
100
100
300
300
15
0
300
400
600
600
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.
1X052DSB
3
DVCH2800D Series
BLOCK DIAGRAM
PIN 1
28V IN
L1
C1
IN COM
PIN 2
C3
Q1
D2
UNDER
VOLTAGE
SHUTDOWN
PWM
CONTROL
Rs1
C2
OUT COM
PIN 4
-VOUT
PIN 6
T1
D1
PIN 3
+V OUT
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 7
VOLTAGE
AMPLIFIER
Figure 2
CONNECTION DIAGRAM
1
28V IN
28 Vdc
7
INH
2
IN COM
-V OUT
OUT COM
+V OUT
3
LO AD
4
LO AD
6
+
-
Figure 3
1X052DSB
4
DVCH2800D Series
INHIBIT DRIVE CONNECTION DIAGRAMS
28V IN
1
12K
28V IN
1
12K
INH
7
BIAS
OPTOISOLATOR
INH
7
BIAS
OPTIONAL
CAPACITOR
IN COM
2
12V
OPTIONAL
CAPACITOR
IN COM
2
12V
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
DVMSA28 EMI FILTER
1
28V IN
28 Vdc
28V OUT
7
INH
7
IN COM
OUT COM
4,8
CASE
5,6
2
IN COM
5
-V OUT
OUT COM
LOAD
6
2,3
DVCH2800D DC-DC CONVERTER
1
28V IN
+V OUT
LOAD
4
3
+
-
Figure 6
– Converter with EMI Filter
1X052DSB
5
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