DVCH2800S Series
1X051DSC
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 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
· 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-461E EMC
Requirements When Used With a DVMSA28
EMI Filter
· MIL-PRF-38534 Element Evaluated
Components
Figure 1
DVCH2800S DC-DC Converter
(Not To Scale)
DVCH2800S Series
1X051DSC
2
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+5°C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65°C to +150°C
Output Power
1
1.5 Watts
Lead Solder Temperature (10 seconds)
270°C
Power Dissipation (Full Load, T
CASE
= +125°C)
0.6 Watts
Weight (Maximum)
11 Grams
DVCH283R3S DVCH2805S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous
12 28 50 12 28 50 V
INPUT
Voltage
4
Transient,
1
sec
- - 80 - - 80 V
Inhibited
- - 3.5 - - 3.5
mA
Current
No
Load
- - 10 - - 10
mA
Ripple Current
Full Load, 20Hz to 10MHz
-
-
30
-
-
30
mA
p-p
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
8.0 9.0 11.0 8.0 9.0 11.0 V
UVLO Turn On
6.5
-
11.5
6.5
-
11.5
V
V
OUT
T
CASE
=
25°C
3.267 3.30 3.333 4.95 5.00 5.05 V
OUTPUT
Voltage
V
OUT
T
CASE
=
-55°C
to
+125°C 3.17 3.30 3.43 4.80 5.00 5.20 V
Power
3
0 - 1.0 0 - 1.5
W
Current
3
I
OUT
0 - 0.3 0 - 0.3
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
50
-
-
50
mV
p-p
Line Regulation
V
OUT
V
IN
= 12V to 50V
-
-
150
-
-
150
mV
Load Regulation
V
OUT
10% Load to Full Load
-
-
400
-
-
400
mV
Load Regulation
V
OUT
50% Load to Full Load
-
-
250
-
-
250
mV
EFFICIENCY
69 75 - 72 79 - %
Overload
4
- - 3 - - 3 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 4 - - 4 W
CAPACITIVE LOAD
4
- - 500 - - 500
µF
SWITCHING
FREQUENCY
325 400 475 325 400 475 kHz
ISOLATION 500
V
DC
100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55°C
- 841 - - 841 - kHrs
DYNAMIC
Load Step Output Transient
5
V
OUT
- 150
300 - 150
500
mV
PK
Load Step Recovery
2
Half Load to Full Load
- 200
500 - 400
600
µSec
Line Step Output Transient
4,5
V
OUT
- 150
300 - 250
400
mV
PK
Line Step Recovery
2, 4
V
IN
= 12V to 50V
- 200
500 - 400
600
µSec
Turn On Delay
V
OUT
- 15 20 - 15 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 135°C.
4. Verified by qualification testing. 5. Does not include changes due to static
regulation.
DVCH2800S Series
1X051DSC
3
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+5°C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65°C to +150°C
Output Power
1
1.5 Watts
Lead Solder Temperature (10 seconds)
270°C
Power Dissipation (Full Load, T
CASE
= +125°C)
0.6 Watts
Weight (Maximum)
11 Grams
DVCH2812S DVCH2815S
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous
12 28 50 12 28 50 V
INPUT
Voltage
4
Transient,
1
sec
- - 80 - - 80 V
Inhibited
- - 3.5 - - 3.5
mA
Current
No
Load
- - 10 - - 10
mA
Ripple Current
Full Load, 20Hz to 10MHz
-
-
30
-
-
30
mA
p-p
Inhibit Pin Input
4
0 - 1.5 0 - 1.5
V
Inhibit Pin Open Circuit Voltage
4
8.0 9.0 11.0 8.0 9.0 11.0 V
UVLO Turn On
6.5
-
11.5
6.5
-
11.5
V
V
OUT
T
CASE
=
25°C
11.88 12.0 12.12 14.85 15.0 15.15 V
OUTPUT
Voltage
V
OUT
T
CASE
=
-55°C
to
+125°C 11.52 12.0 12.48 14.40 15.0 15.60 V
Power
3
0 - 1.5 0 - 1.5
W
Current
3
I
OUT
0 -
0.125
0 - 0.1
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
50
-
-
50
mV
p-p
Line Regulation
V
OUT
V
IN
= 12V to 50V
-
-
60
-
-
60
mV
Load Regulation
V
OUT
10% Load to Full Load
-
-
700
-
-
700
mV
Load Regulation
V
OUT
50% Load to Full Load
-
-
250
-
-
250
mV
EFFICIENCY
76 81 - 77 81 - %
Overload
4
- - 3 - - 3 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 4.5 - - 4.5
W
CAPACITIVE LOAD
4
- - 200 - - 200
µF
SWITCHING
FREQUENCY
325 400 475 325 400 475 kHz
ISOLATION 500
V
DC
100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55°C
- 841 - - 841 - kHrs
DYNAMIC
Load Step Output Transient
5
V
OUT
- 100
300 - 100
300
mV
PK
Load Step Recovery
2
Half Load to Full Load
- 50
400 - 50
400
µSec
Line Step Output Transient
4,5
V
OUT
- 150
400 - 150
400
mV
PK
Line Step Recovery
2, 4
V
IN
= 12V to 50V
- 100
400 - 100
400
µSec
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 135°C.
4. Verified by qualification testing. 5. Does not include changes due to static
regulation.
DVCH2800S Series
1X051DSC
4
SPECIFICATIONS
(T
CASE
= -55°C to +125°C, V
IN
= +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+5°C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65°C to +150°C
Output Power
1
1.5 Watts
Lead Solder Temperature (10 seconds)
270°C
Power Dissipation (Full Load, T
CASE
= +125°C)
0.6 Watts
Weight (Maximum)
11 Grams
DVCH285R2S
Parameter Conditions
Min Typ Max
Units
STATIC
Continuous
12 28 50 V
INPUT
Voltage
4
Transient, 1 sec
-
-
80
V
Inhibited -
-
3.5
mA
Current
No Load
-
-
10
mA
Ripple Current
Full Load, 20Hz to 10MHz
-
-
30
mA
p-p
Inhibit Pin Input
4
0
-
1.5
V
Inhibit Pin Open Circuit Voltage
4
8.0
9.0
11.0
V
UVLO Turn On
6.5
-
11.5
V
V
OUT
T
CASE
= 25°C
5.15
5.20
5.25
V
OUTPUT
Voltage
V
OUT
T
CASE
= -55°C to +125°C
5.00
5.20
5.40
V
Power
3
0
-
1.5
W
Current
3
I
OUT
0
-
0.288
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
50
mV
p-p
Line Regulation
V
OUT
V
IN
= 12V to 50V
-
-
150
mV
Load Regulation
V
OUT
10% Load to Full Load
-
-
400
mV
Load Regulation
V
OUT
50% Load to Full Load
-
-
250
mV
EFFICIENCY
72
79
-
%
Overload
4
- - 3 W
LOAD FAULT POWER DISSIPATION
Short Circuit
-
-
4
W
CAPACITIVE LOAD
4
-
-
500
µF
SWITCHING
FREQUENCY
325 400 475 kHz
ISOLATION 500
V
DC
100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
= 55°C
-
841
-
kHrs
DYNAMIC
Load Step Output Transient
5
V
OUT
- 150
300
mV
PK
Load Step Recovery
2
Half Load to Full Load
- 400
600
µSec
Line Step Output Transient
4,5
V
OUT
- 250
400
mV
PK
Line Step Recovery
2, 4
V
IN
= 12V to 50V
- 400
600
µSec
Turn On Delay
V
OUT
- 15 20
mSec
Turn On Overshoot
V
IN
= 0V to 28V
- 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 135°C.
4. Verified by qualification testing. 5. Does not include changes due to static
regulation.
DVCH2800S Series
1X051DSC
5
BLOCK DIAGRAM
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
VOLTAGE
AMPLIFIER
PIN 1
28V IN
PIN 2
IN COM
L1
C1
Q1
Rs1
T1
D1
C2
+V OUT
PIN 3
PIN 4
OUT COM
INH
PIN 7
Figure 2
CONNECTION DIAGRAM
2
IN COM
7
INH
1
28V IN
3
+V OUT
4
OUT COM
LOAD
+
-
28 Vdc
Figure 3
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