DVCH2800S 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 are robust and effective
input and output filters which provide dramatically
reduced input and output noise performance when
compared to other manufacturers competing
devices. Operating at a nominal fixed frequency of
400 kHz, these regulated, isolated units utilize a high
speed magnetic feedback design and 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
NO Use of Optoisolators
Fault Tolerant Magnetic Feedback Circuit
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-461E EMC
Requirements When Used With a DVMSA28
EMI Filter
MIL-PRF-38534 Element Evaluated
Components
Space Applications should consider VPT’s “S”
Series of Radiation Tolerant Power Conversion
Devices. Contact VPT for details.
Figure 1
– DVCH2800S DC-DC Converter
(Exact
marking may differ from that shown)
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
DS1X051F
1
DVCH2800S 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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
1.5 Watts
0.6 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
OUTPUT
Voltage
Power
3
3
4
4
Conditions
Min
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
12
-
-
-
-
0
8.0
6.5
V
OUT
V
OUT
I
OUT
V
OUT
V
OUT
V
OUT
V
OUT
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
DVCH283R3S
Typ
28
-
-
-
-
-
9.0
-
3.30
3.30
-
-
-
-
-
-
75
-
-
-
400
-
841
DVCH2805S
Max
50
80
3.5
10
30
1.5
11.0
11.5
3.333
3.43
1.0
0.3
50
150
400
250
-
3
4
500
475
-
-
Units
Max
50
80
3.5
10
30
1.5
11.0
11.5
5.05
5.20
1.5
0.3
50
150
400
250
-
3
4
500
475
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
A
mV
p-p
mV
mV
mV
%
W
W
μF
kHz
MΩ
kHrs
Min
12
-
-
-
-
0
8.0
6.5
4.95
4.80
0
0
-
-
-
-
72
-
-
-
325
100
-
Typ
28
-
-
-
-
-
9.0
-
5.00
5.00
-
-
-
-
-
-
79
-
-
-
400
-
841
Inhibit Pin Open Circuit Voltage
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
3.267
3.17
0
0
-
-
-
-
69
-
-
-
325
Current
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
5
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4,5
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 12V to 50V
V
IN
= 0V to 28V
-
-
-
-
-
-
150
200
150
200
15
0
300
500
300
500
20
15
-
-
-
-
-
-
150
400
250
400
15
0
300
600
400
600
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.
regulation.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
5. Does not include changes due to static
DS1X051F
2
DVCH2800S 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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
1.5 Watts
0.6 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
OUTPUT
Voltage
Power
3
3
4
4
Conditions
Min
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
12
-
-
-
-
0
8.0
6.5
V
OUT
V
OUT
I
OUT
V
OUT
V
OUT
V
OUT
V
OUT
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
DVCH2812S
Typ
28
-
-
-
-
-
9.0
-
12.0
12.0
-
-
-
-
-
-
81
-
-
-
400
-
841
DVCH2815S
Max
50
80
3.5
10
30
1.5
11.0
11.5
12.12
12.48
1.5
0.125
50
60
700
250
-
3
4.5
200
475
-
-
Units
Max
50
80
3.5
10
30
1.5
11.0
11.5
15.15
15.60
1.5
0.1
50
60
700
250
-
3
4.5
200
475
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
A
mV
p-p
mV
mV
mV
%
W
W
μF
kHz
MΩ
kHrs
Min
12
-
-
-
-
0
8.0
6.5
14.85
14.40
0
0
-
-
-
-
77
-
-
-
325
100
-
Typ
28
-
-
-
-
-
9.0
-
15.0
15.0
-
-
-
-
-
-
81
-
-
-
400
-
841
Inhibit Pin Open Circuit Voltage
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
11.88
11.52
0
0
-
-
-
-
76
-
-
-
325
Current
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
5
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4,5
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 12V to 50V
V
IN
= 0V to 28V
-
-
-
-
-
-
100
50
150
100
10
0
300
400
400
400
20
50
-
-
-
-
-
-
100
50
150
100
10
0
300
400
400
400
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.
regulation.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
5. Does not include changes due to static
DS1X051F
3
DVCH2800S 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)
ESD Rating per MIL-PRF-38534
50 V
DC
80 Volts
1.5 Watts
0.6 Watts
3A
Junction Temperature Rise to Case
Storage Temperature
Lead Solder Temperature (10 seconds)
Weight (Maximum)
+5°C
-65°C to +150°C
270°C
11 Grams
Parameter
STATIC
INPUT
4
Voltage
Current
Ripple Current
Inhibit Pin Input
UVLO Turn On
OUTPUT
Voltage
Power
3
3
4
4
Conditions
Min
Continuous
Transient, 1 sec
Inhibited
No Load
Full Load, 20Hz to 10MHz
12
-
-
-
-
0
8.0
6.5
V
OUT
V
OUT
I
OUT
V
OUT
V
OUT
V
OUT
V
OUT
Full Load, 20Hz to 10MHz
V
IN
= 12V to 50V
10% Load to Full Load
50% Load to Full Load
Overload
4
DVCH285R2S
Typ
28
-
-
-
-
-
9.0
-
5.20
5.20
-
-
-
-
-
-
79
-
-
-
400
-
841
Units
Max
50
80
3.5
10
30
1.5
11.0
11.5
5.25
5.40
1.5
0.288
50
150
400
250
-
3
4
500
475
-
-
V
V
mA
mA
mA
p-p
V
V
V
V
V
W
A
mV
p-p
mV
mV
mV
%
W
W
μF
kHz
MΩ
kHrs
Inhibit Pin Open Circuit Voltage
T
CASE
= 25°C
T
CASE
= -55°C to +125°C
5.15
5.00
0
0
-
-
-
-
72
-
-
-
325
Current
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
5
100
-
DYNAMIC
Load Step Output Transient
Load Step Recovery
Line Step Recovery
Turn On Delay
Turn On Overshoot
2
4,5
V
OUT
V
OUT
V
OUT
Half Load to Full Load
V
IN
= 12V to 50V
V
IN
= 0V to 28V
-
-
-
-
-
-
150
400
250
400
15
0
300
600
400
600
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.
regulation.
2. Time for output voltage to settle within 1% of its nominal value.
4. Verified by qualification testing.
5. Does not include changes due to static
DS1X051F
4
DVCH2800S Series
BLOCK DIAGRAM
PIN 1
28V IN
L1
C1
IN COM
PIN 2
Q1
C2
OUT COM
PIN 4
T1
D1
PIN 3
+V OUT
UNDER
VOLTAGE
SHUTDOWN
PWM
CONTROL
Rs1
PRIMARY
HOUSEKEEPING
SUPPLY
INH
PIN 7
VOLTAGE
AMPLIFIER
Figure 2
CONNECTION DIAGRAM
1
28V IN
28 Vdc
7
INH
2
IN COM
OUT COM
+V OUT
3
LOAD
+
-
4
Figure 3
DS1X051F
5
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