DVEHF2800T Series
DS1X030H
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
WITH INTEGRAL EMI FILTER
DESCRIPTION
The DVEHF 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 DVEHF 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
450 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
• High Reliability
• Very Low Output Noise
• Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704
• Up to 10 Watts Output Power
• Fault Tolerant 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
• Solder Seal Hermetic Package
• Custom Versions Available
• Additional Environmental Screening Available
• No External EMI Filter Required
• Meets MIL-STD-461C and MIL-STD-461D EMC
Requirements
• Protects Against Conducted Susceptibility
Specified in MIL-STD-461C, SC01 and CS02
• Non-flanged Version Available
• MIL-PRF-38534 Element Evaluated
Components
Figure 1 – DVEHF2800T DC-DC Converter
(Not To Scale)
DVEHF2800T Series
DS1X030H 2
SPECIFICATIONS (TCASE = -55°C to +125°C, VIN = +28V ± 5%, Full Load5, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Junction Temperature Rise to Case +15°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -65°C to +150°C
Output Power 10 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +125°C) 5.0 Watts Weight (Maximum) 50 Grams
DVEHF28512T DVEHF28515T
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
Continuous 15 28 50 15 28 50 V
INPUT
Voltage Transient, 1 sec4 - - 80 - - 80 V
Inhibited - 3.5 6.0 - 3.5 6.0 mA
Current
No Load - - 70 - - 70 mA
Inhibit Pin Input4 0 - 1.5 0 - 1.5 V
Inhibit Pin Open Circuit Voltage4 9.0 11.0 13.0 9.0 11.0 13.0 V
UVLO Turn On 8.0 - 12.0 8.0 - 12.0 V
UVLO Turn Off4 4.0 - 8.0 4.0 - 8.0 V
VMAIN 4.95 5.0 5.05 4.95 5.0 5.05 V
±VAUX
TCASE = 25°C 11.88 12.0 12.12 14.85 15.0 15.15 V
VMAIN 4.925 5.0 5.075 4.925 5.0 5.075 V
OUTPUT
Voltage
±VAUX
TCASE = -55°C to +125°C 11.4 12.0 12.6 14.25 15.0 15.75 V
Total 0 - 10 0 - 10 W
VMAIN 0.15 - 5.0 0.15 - 5.0 W
Power4
±VAUX
6 Either Output 0 - 3.5 0 - 3.5 W
VMAIN 0 - 1.0 0 - 1.0 A
Current3
±VAUX Either Output6 0 - 0.29 0 - 0.23 A
VMAIN - 15 50 - 15 50 mVp-p
Ripple Voltage ±VAUX
Full Load5, 20Hz to 10MHz - 15 50 - 15 50 mVp-p
VMAIN - 10 20 - 10 20 mV
Line Regulation ±VAUX
VIN = 15V to 50V - 15 50 - 15 50 mV
VMAIN - 5 20 - 5 20 mV
Load Regulation ±VAUX
No Load to Full Load5, 7
- 10 50 - 10 50 mV
Cross Regulation ±VAUX
+VOUT = 30%, -VOUT = 70%
+VOUT = 70%, -VOUT = 30% - - 50 - - 50 mV
EFFICIENCY Full Load5 67 72 - 67 72 - %
Overload4 - - 7.5 - - 7.5 W
LOAD FAULT POWER DISSIPATION Short Circuit - - 7.5 - - 7.5 W
CAPACITIVE LOAD4 - - 500 - - 500
μF
SWITCHING FREQUENCY 350 450 550 350 450 550 kHz
ISOLATION 500 VDC, TCASE = 25°C 100 - - 100 - - MΩ
MTBF (MIL-HDBK-217F) AIF @ TC = 55°C - 350 - - 350 - kHrs
DVEHF2800T Series
DS1X030H 3
SPECIFICATIONS (TCASE = -55°C to +125°C, VIN = +28V ± 5%, Full Load5, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Junction Temperature Rise to Case +15°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -65°C to +150°C
Output Power 10 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +125°C) 5.0 Watts Weight (Maximum) 50 Grams
DVEHF28512T DVEHF28515T
Parameter Conditions
Min Typ Max Min Typ Max
Units
DYNAMIC
VMAIN - 200 500 - 200 500 mVPK
Load Step Output Transient ±VAUX - 100 400 - 100 400 mVPK
VMAIN - 200 500 - 200 500
μSec
Load Step Recovery2 ±VAUX
Half Load to Full Load
- 200 500 - 200 500
μSec
VMAIN - 200 600 - 200 600 mVPK
Line Step Output Transient4
±VAUX - 50 100 - 50 100 mVPK
VMAIN - 200 500 - 200 500
μSec
Line Step Recovery2, 4 ±VAUX
VIN = 16V to 40V
- 200 500 - 200 500
μSec
Turn On Delay - 25 35 - 25 35 mSec
VMAIN - - 25 - - 25 mVPK
Turn On Overshoot ±VAUX
VIN = 0V to 28V
- - 50 - - 50 mVPK
Notes: 1. This note intentionally not used.
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. 5.0W on VMAIN and 2.5W on ±VAUX.
6. Up to 70% of the total auxiliary power or current can be drawn from either of the auxiliary outputs.
7. 5% load to full load at -55°C.
DVEHF2800T Series
DS1X030H 4
BLOCK DIAGRAM
PRIMARY
HOUSEKEEPING
SU
PPL
Y
PWM
CONTROLLER
PIN 2
INH
TRANSFORMER
ISOLATED
SIGNAL
FEEDBACK
POWER
FEEDFORWARD
VOLTAGE
ERROR
AMPLIFIERS
SECONDARY
HOUSKEEPING
SUPPLY
IN COM
PIN 10
28V IN
PIN 1
+V MAIN
PIN 7
MAIN COM
PIN 6
+V AUX
PIN 3
-V AUX
PIN 5
EMI
FILTER
LINEAR
RE
G
LINEAR
RE
G
AUX COM
PIN 4
Figure 2
DVEHF2800T Series
DS1X030H 5
CONNECTION DIAGRAM
10
IN COM
2
INH
1
28V IN
3
+V AUX
6
MAIN COM
LOAD
+
-
28 Vdc
5
-V AUX
LOAD
AUX COM
4
7
+V MAIN
LOAD
Figure 3
INHIBIT DRIVE CONNECTION DIAGRAMS
10IN COM
2INH
128V IN
OPTIONAL
CAPACITOR
BIAS
12V
10K
10IN COM
2INH
128V IN
OPTIONAL
CAPACITOR
BIAS
12V
10K
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)
DVEHF2800T Series
DS1X030H 6
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C)
V
IN = 15V VIN = 28V VIN = 50V
50
55
60
65
70
75
2.5 5 7.5 10
Output Power (W)
Efficiency (%)
Figure 7 – DVEHF28512T
Efficiency (%) vs. Output Power (W)
50
55
60
65
70
75
2.5 5 7.5 10
Output Power (W)
Efficiency (%)
Figure 8 – DVEHF28515T
Efficiency (%) vs. Output Power (W)
DVEHF2800T Series
DS1X030H 7
EMI PERFORMANCE CURVES
(TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
Figure 9 – MIL-STD-461C
DVEHF2800T
Figure 10 – MIL-STD-461D
DVEHF2800T
DVEHF2800T Series
DS1X030H 8
PACKAGE SPECIFICATIONS (NON-FLANGED, SOLDER SEAL)
PIN FUNCTION PIN FUNCTION
1 28V IN 6 MAIN COM
2 INHIBIT 7 +V MAIN
3 +V AUX 8 CASE
4 AUX COM 9 N/C
5 -V AUX 10 IN COM
Figure 11 – Non-Flanged, Solder Seal Package and Pinout
DVEHF2800T Series
DS1X030H 9
PACKAGE PIN DESCRIPTION
Pin Function Description
1 28V IN Positive Input Voltage Connection
2 INHIBIT
Logic Low = Disabled Output. Connecting the inhibit pin to input common causes
converter shutdown.
Logic High = Enabled Output. Unconnected or open collector TTL.
3 +V AUX Positive Auxiliary Output Voltage Connection
4 AUX COM Auxiliary Output Common Connection
5 -V AUX Negative Auxiliary Output Voltage Connection
6 MAIN COM Main Output Common Connection
7 +V MAIN Positive Main Output Voltage Connection
8 CASE Case Connection
9 N/C No Connection
10 IN COM Input Common Connection
DVEHF2800T Series
DS1X030H 10
ENVIRONMENTAL SCREENING (100% Tested Per MIL-STD-883 as referenced to MIL-PRF-38534)
Screening MIL-STD-883 Standard
(No Suffix) Extended
/ES
Non-
Destructive
Bond Pull
Method 2023 • •
Internal
Visual
Method 2017, 2032
Internal Procedure
•
•
Temperature
Cycling Method 1010, -55°C to 125°C •
Constant
Acceleration Method 2001, 500g, Y1 Direction •
Burn-In 96 hours at +125°C
24 hours at +125°C
•
•
Final
Electrical 100% at 25°C • •
Hermeticity
Method 1014, Fine Leak, Condition A
Method 1014, Gross Leak, Condition C
Dip (1 x 10-3)
•
•
•
External
Visual Method 2009 • •
DVEHF2800T Series
DS1X030H 11
ORDERING INFORMATION
DVEHF 28 5 12 T /ES - XXX
1 2 3 4 5 6 7
(1) (2) (3) (4)
Product Series Nominal Input
Voltage Main Output Voltage Auxiliary Output
Voltages
DVEHF
28
28 Volts
5
+ 5 Volts
12
15
± 12 Volts
± 15 Volts
(5) (6) (7)
Number of Outputs Screening Code1 Additional Screening
Code
T
Triple
None
/ES
Standard
Extended
Contact Sales
Notes: 1. VPT Inc. reserves the right to ship higher screened products to meet lower screened orders at our sole
discretion unless specifically forbidden by customer contract.
Please contact your sales representative or the VPT Inc. Sales Department for more information
concerning additional environmental screening and testing, different input voltage, output voltage,
power requirement, source inspection, and/or special element evaluation for space or other higher
quality applications.
CONTACT INFORMATION
To request a quotation or place orders please contact your sales representative or the VPT Inc. Sales
Department at:
Phone: (425) 353-3010
Fax: (425) 353-4030
E-mail: vptsales@vpt-inc.com
All information contained in this datasheet is believed to be accurate, however, no responsibility is assumed for possible errors
or omissions. The products or specifications contained herein are subject to change without notice.
