DVCH2800D Series
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
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-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)
DVCH2800D Series
1X052DSB
2
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+5C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
1
1.5 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
0.6 Watts
Weight (Maximum)
11 Grams
DVCH2805D DVCH2812D
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 - - 12
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
=
25C
4.95 5.00 5.05 11.88 12.0 12.12 V
OUTPUT
Voltage
V
OUT
T
CASE
=
-55C
to
+125C 4.80 5.00 5.20 11.52 12.0 12.48 V
Total
0 - 1.5 0 - 1.5
W
Power
3
V
OUT
Either
Output
0 - 1.2 0 - 1.2
W
Current
3
I
OUT
Either
Output
0 -
0.24
0 - .1 A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
50
-
-
100
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
-
-
700
mV
Load Regulation
V
OUT
50% Load to Full Load
-
-
250
-
-
250
mV
EFFICIENCY
72 79 - 74 79 - %
Overload
4
- - 3 - - 3 W
LOAD FAULT POWER DISSIPATION
Short
Circuit
- - 4 - - 4.5
W
CAPACITIVE LOAD
4
- - 500 - - 200
F
SWITCHING
FREQUENCY
325 400 475 325 400 475 kHz
ISOLATION 500
V
DC
100 - - 100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
=
55C
- 841 - - 841 - kHrs
DYNAMIC
Load Step Output Transient
V
OUT
- 100
300 - 100
300
mV
PK
Load Step Recovery
2
Half Load to Full Load
- 200
500 - 100
400
Sec
Line Step Output Transient
4
V
OUT
- 200
400 - 300
600
mV
PK
Line Step Recovery
2, 4
V
IN
= 12V to 50V
- 400
600 - 300
600
Sec
Turn On Delay
V
OUT
- 15 20 - 15 20
mSec
Turn On Overshoot
V
IN
= 0V to 28V
- 0 25 - 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 135C.
4. Verified by qualification testing.
DVCH2800D Series
1X052DSB
3
SPECIFICATIONS
(T
CASE
= -55C to +125C, V
IN
= +28V 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous)
50 V
DC
Junction Temperature Rise to Case
+5C
Input Voltage (Transient, 1 second)
80 Volts
Storage Temperature
-65C to +150C
Output Power
1
1.5 Watts
Lead Solder Temperature (10 seconds)
270C
Power Dissipation (Full Load, T
CASE
= +125C)
0.6 Watts
Weight (Maximum)
11 Grams
DVCH2815D
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
-
-
14
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
= 25C
14.85
15.0
15.15
V
OUTPUT
Voltage
V
OUT
T
CASE
= -55C to +125C
14.40
15.0
15.60
V
Total
0
-
1.5
W
Power
3
V
OUT
Either Output
0
-
1.2
W
Current
3
I
OUT
Either Output
0
-
0.08
A
Ripple Voltage
V
OUT
Full Load, 20Hz to 10MHz
-
-
100
mV
p-p
Line Regulation
V
OUT
V
IN
= 12V to 50V
-
-
150
mV
Load Regulation
V
OUT
10% Load to Full Load
-
-
700
mV
Load Regulation
V
OUT
50% Load to Full Load
-
-
250
mV
EFFICIENCY
74
79
-
%
Overload
4
- - 3 W
LOAD FAULT POWER DISSIPATION
Short Circuit
-
-
4.5
W
CAPACITIVE LOAD
4
-
-
200
F
SWITCHING
FREQUENCY
325 400 475 kHz
ISOLATION 500
V
DC
100 - - M
MTBF (MIL-HDBK-217F)
AIF @ T
C
= 55C
-
841
-
kHrs
DYNAMIC
Load Step Output Transient
V
OUT
- 100
300
mV
PK
Load Step Recovery
2
Half Load to Full Load
- 100
400
Sec
Line Step Output Transient
4
V
OUT
- 300
600
mV
PK
Line Step Recovery
2, 4
V
IN
= 12V to 50V
- 300
600
Sec
Turn On Delay
V
OUT
- 15 20
mSec
Turn On Overshoot
V
IN
= 0V to 28V
- 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 135C.
4. Verified by qualification testing.
DVCH2800D Series
1X052DSB
4
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
D2
C3
PIN 6
-VOUT
Figure 2
CONNECTION DIAGRAM
2
IN COM
7
INH
1
28V IN
3
+V OUT
4
OUT COM
LO AD
+
-
28 Vdc
6
-V OUT
LO AD
Figure 3
DVCH2800D Series
1X052DSB
5
INHIBIT DRIVE CONNECTION DIAGRAMS
2
IN COM
7
INH
1
28V IN
OPTIONAL
CAPACITOR
BIAS
12V
12K
2
IN COM
7
INH
1
28V IN
OPTIONAL
CAPACITOR
BIAS
12V
12K
OPTOISOLATOR
Figure 4
Internal Inhibit Circuit and Recommended Drive
Figure 5
Isolated Inhibit Drive
(Shown with optional capacitor for turn-on delay)
(Shown with optional capacitor for turn-on delay)
EMI FILTER HOOKUP DIAGRAM
2
IN COM
7
INH
1
28V IN
3
+V OUT
4
OUT COM
LOAD
+
-
28 Vdc
2,3
28V OUT
5,6
OUT COM
1
28V IN
7
IN COM
4,8
DVMSA28 EMI FILTER
5
DVCH2800D DC-DC CONVERTER
CASE
6
-V OUT
LOAD
Figure 6
Converter with EMI Filter
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