DVST2800T Series
DS90054E
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
DC-DC CONVERTERS
DESCRIPTION
The DVST series of high reliability DC-DC converters
contains internal EMI filtering and meets MIL-STD-
461C and MIL-STD-461D for conducted emissions,
providing a one piece COTS solution for power
conversion applications. The DVST series is
operable over a wide (-55°C to +100°C) temperature
range with no power derating. Unique to the DVST
series is a magnetic feedback circuit that is radiation
immune. The three low noise outputs are fully
isolated from each other, allowing for maximum
flexibility in system design.
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
• Up to 30 Watts Output Power
• Three Fully Isolated Outputs
• Wide Input Voltage Range: 15 to 50 Volts per
MIL-STD-704 with 80 Volt Transient for 1 sec
• Internal Filter Meets MIL-STD-461C and MIL-
STD-461D Conducted Emissions Requirements
• NO Use of Optoisolators
• Undervoltage Lockout
• Indefinite Short Circuit Protection
• Current Limit Protection
• Low Output Noise
• Custom Versions Available
• Low Profile (0.380 inches) Package
• Military Environmental Screening Available
Figure 1 – DVST2800T DC-DC Converter
(Not To Scale)
DVST2800T Series
DS90054E 2
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Operating Case Temperature -55°C to +100°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -55°C to +125°C
Output Power1 30 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +100°C) 15 Watts Weight (Maximum) 100 Grams
INPUT
DVST2800T
Parameter Conditions
Min Typ Max
Units
STATIC
Continuous 15 28 50 V
INPUT
Voltage Transient, 1 sec 80 V
Inhibited 1.6 5.0 mA
Current
No Load 65 100 mA
Inhibit Pin Input 0 1.5 V
Inhibit Pin Open Circuit Voltage 11.0 14.0 V
UVLO Turn On 14.9 V
UVLO Turn Off 11.8 V
SWITCHING FREQUENCY 225 325 kHz
ISOLATION Input / Output / Case 500 VDC 100 MΩ
MAIN OUTPUT
DVST283R3xxyyT DVST285xxyyT
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
VOUT TCASE = 25°C 3.26 3.30 3.34 4.95 5.00 5.05 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 3.23 3.30 3.37 4.90 5.00 5.10 V
Power2 0 15 0 20 W
Current2 V
OUT 0 4.5 0 4.0 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz 20 50 20 50 mVp-p
Line Regulation VOUT VIN = 15V to 50V 5 20 5 20 mV
Load Regulation VOUT No Load to Full Load 10 30 10 30 mV
EFFICIENCY 73 76 %
CAPACITIVE LOAD 1000 1000
μF
DYNAMIC
Load Step Output Transient VOUT 200 400 200 400 mVPK
Load Step Recovery3 Half Load to Full Load 200 400 200 400
μSec
Line Step Output Transient VOUT 400 600 400 600 mVPK
Line Step Recovery3 VIN = 15V to 50V 400 600 400 600
μSec
Turn On Delay VOUT 15 20 15 20 mSec
Turn On Overshoot VIN = 0V to 28V 0 30 0 50 mVPK
DVST2800T Series
DS90054E 3
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Operating Case Temperature -55°C to +100°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -55°C to +125°C
Output Power1 30 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +100°C) 15 Watts Weight (Maximum) 100 Grams
MAIN OUTPUT
DVST281R8xxyyT DVST286R25xxyyT
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
VOUT TCASE = 25°C 1.78 1.80 1.82 6.19 6.25 6.31 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 1.76 1.80 1.84 6.12 6.25 6.38 V
Power2 0 13.5 0 20 W
Current2 V
OUT 0 7.5 0 3.2 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz 20 75 20 50 mVp-p
Line Regulation VOUT VIN = 15V to 50V 5 20 5 20 mV
Load Regulation VOUT No Load to Full Load 10 30 10 30 mV
EFFICIENCY 66 76 %
CAPACITIVE LOAD 1000 1000
μF
DYNAMIC
Load Step Output Transient VOUT 200 400 200 400 mVPK
Load Step Recovery3 Half Load to Full Load 500 750 200 400
μSec
Line Step Output Transient VOUT 400 600 400 600 mVPK
Line Step Recovery3 VIN = 15V to 50V 400 750 400 600
μSec
Turn On Delay VOUT 15 20 15 20 mSec
Turn On Overshoot VIN = 0V to 28V 0 20 0 50 mVPK
DVST2800T Series
DS90054E 4
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Operating Case Temperature -55°C to +100°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -55°C to +125°C
Output Power1 30 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +100°C) 15 Watts Weight (Maximum) 100 Grams
MAIN OUTPUT
DVST2812xxyyT
Parameter Conditions
Min Typ Max
Units
STATIC
VOUT TCASE = 25°C 11.88 12.00 12.12 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 11.76 12.00 12.24 V
Power2 20 W
Current2 V
OUT 1.67 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz 50 mVp-p
Line Regulation VOUT VIN = 15V to 50V 50 mV
Load Regulation VOUT No Load to Full Load 50 mV
EFFICIENCY 76 %
CAPACITIVE LOAD 500
μF
DYNAMIC
Load Step Output Transient VOUT 200 400 mVPK
Load Step Recovery3 Half Load to Full Load 200 400
μSec
Line Step Output Transient VOUT 400 600 mVPK
Line Step Recovery3 VIN = 15V to 50V 200 600
μSec
Turn On Delay VOUT 15 20 mSec
Turn On Overshoot VIN = 0V to 28V 0 50 mVPK
DVST2800T Series
DS90054E 5
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Operating Case Temperature -55°C to +100°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -55°C to +125°C
Output Power1 30 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +100°C) 15 Watts Weight (Maximum) 100 Grams
AUXILIARY OUTPUT
DVST28x12yyT DVST28x15yyT
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
VOUT TCASE = 25°C 11.76 12.00 12.24 14.70 15.00 15.30 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 11.64 12.00 12.36 14.55 15.00 15.45 V
Power2 0 5 0 5 W
Current2 V
OUT 0 0.42 0 0.33 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz 25 50 25 50 mVp-p
Line Regulation VOUT VIN = 15V to 50V 5 20 5 20 mV
Load Regulation VOUT No Load to Full Load 10 50 10 50 mV
CAPACITIVE LOAD 500 500
μF
DYNAMIC
Load Step Output Transient VOUT 200 400 200 400 mVPK
Load Step Recovery3 Half Load to Full Load 100 200 100 200
μSec
Line Step Output Transient VOUT 100 400 100 400 mVPK
Line Step Recovery3 VIN = 15V to 50V 100 200 100 200
μSec
Turn On Delay VOUT 2 20 2 20 mSec
Turn On Overshoot VIN = 0V to 28V 100 250 100 250 mVPK
DVST2800T Series
DS90054E 6
SPECIFICATIONS (TCASE = -55°C to +100°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
ABSOLUTE MAXIMUM RATINGS
Input Voltage (Continuous) 50 VDC Operating Case Temperature -55°C to +100°C
Input Voltage (Transient, 1 second) 80 Volts Storage Temperature -55°C to +125°C
Output Power1 30 Watts Lead Solder Temperature (10 seconds) 270°C
Power Dissipation (Full Load, TCASE = +100°C) 15 Watts Weight (Maximum) 100 Grams
AUXILIARY OUTPUT
DVST28x3R3yyT DVST28x5yyT
Parameter Conditions
Min Typ Max Min Typ Max
Units
STATIC
VOUT TCASE = 25°C 3.23 3.30 3.37 4.90 5.00 5.10 V
OUTPUT
Voltage VOUT TCASE = -55°C to +100°C 3.20 3.30 3.40 4.85 5.00 5.15 V
Power2 4 5 W
Current2 V
OUT 1.2 1.0 A
Ripple Voltage VOUT Full Load, 20Hz to 10MHz 25 50 25 50 mVp-p
Line Regulation VOUT VIN = 15V to 50V 5 20 5 20 mV
Load Regulation VOUT No Load to Full Load 10 30 10 30 mV
CAPACITIVE LOAD 1000 1000
μF
DYNAMIC
Load Step Output Transient VOUT 100 200 100 200 mVPK
Load Step Recovery3 Half Load to Full Load 100 200 100 200
μSec
Line Step Output Transient VOUT 100 200 100 200 mVPK
Line Step Recovery3 VIN = 15V to 50V 100 200 100 200
μSec
Turn On Delay VOUT 2 20 2 20 mSec
Turn On Overshoot VIN = 0V to 28V 0 50 0 50 mVPK
Notes: 1. Dependant on output voltage.
2. Derate linearly from full rating at 100°C to 0 at 110°C.
3. Time for output voltage to settle to within 1% of its nominal value.
CONNECTION DIAGRAM
3IN COM
4INH
128V IN 5
+MAIN OUT
6
MAIN RET
LOAD
+
-
28 Vdc
2
DVST2800T
CASE
7
+AUX1 OUT
8
AUX1 RET
LOAD
9
+AUX2 OUT
10
AUX2 RET
LOAD
Figure 2
DVST2800T Series
DS90054E 7
BLOCK DIAGRAM
UNDER
VOLTAGE
SHUTDOWN
PRIMARY
HOUSEKEEPING
SUPPLY
PWM
CONTROL
VOLTAGE AND
CURRENT
AMPLIFIERS
SECONDARY
H
OUSEKEEPIN
G
SUPPLY
PIN 1
28V IN
PIN 3
IN COM
+V OUT
PIN 5
PIN 6
OUT COM
INH
PIN 4
FEEDBACK
MAGNETIC
PWM
CONTROL
+V OUT
PIN 7
PIN 8
OUT COM
+V OUT
PIN 9
PIN 10
OUT COM
LINEAR
REGULATOR
LINEAR
REGULATOR
PIN 2
CASE
Figure 3
INHIBIT DRIVE CONNECTION DIAGRAMS
3IN COM
4INH
128V IN
OPTIONAL
CAPACITOR
BIAS
11V
20K
3IN COM
4INH
128V IN
OPTIONAL
CAPACITOR
BIAS
11V
20K
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)
DVST2800T Series
DS90054E 8
EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified)
V
IN = 15V VIN = 28V VIN = 50V
Figure 6 – DVST2851212T Figure 7 – DVST2851515T
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
Figure 8 – DVST283R31212T Figure 9 – DVST283R31515T
Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)
DVST2800T Series
DS90054E 9
EMI PERFORMANCE CURVES
(TCASE = +25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified)
Figure 10 –
MIL-STD-461C CE03 Conducted Emissions
Figure 11 –
MIL-STD-461D CE102 Conducted Emissions
ENVIRONMENTAL QUALIFICATION
Description MIL-STD-883 MIL-STD-202 Test Condition
Temperature Cycling 1010 102A -55°C to +100°C, 100 cycles
Constant Acceleration 2001 212A 500g, 1min.
Mechanical Shock 2002 Cond. A 213B Cond. D 500g, 1ms
Random Vibration 2026 Cond. D 214A Cond. D 11.6G RMS, operating
Moisture Resistance 1004 106F 10 days
Barometric Pressure 1001 Cond. D 105C Cond. C 70,000 ft, operating
Salt Atmosphere 1009 Cond. B 101D Cond. B 48 hrs.
Resistance to Solvents 2015 215J
Solderability 2003 208H
DVST2800T Series
DS90054E 10
PACKAGE SPECIFICATIONS
PIN FUNCTION
1 28V IN
2 CASE
3 IN COM
4 INHIBIT
5 +MAIN OUT
6 MAIN RET
7 +AUX1 OUT
8 AUX1 RET
9 +AUX2 OUT
10 AUX2 RET
Note: Additional mounting options are available. Consult the factory for details.
Figure 12 – Package and Pinout
(Dimensional Limits are ±0.005” Unless Otherwise Stated)
DVST2800T Series
DS90054E 11
PACKAGE PIN DESCRIPTION
Pin Function Description
1 28V IN Positive Input voltage Connection
2 CASE Case Connection
3 IN COM Input Common Connection
4 INHIBIT
Logic Low = Disabled Output. Connecting the inhibit pin to input common (PIN 7)
causes converter shutdown.
Logic High = Enabled Output. Unconnected or open collector TTL.
5 +MAIN OUT Main Positive Output Voltage Connection
6 MAIN RET Main Output Return Connection
7 +AUX1 OUT Auxiliary Positive Output Voltage Connection
8 AUX1 RET Auxiliary Output Return Connection
9 +AUX2 OUT Auxiliary Positive Output Voltage Connection
10 AUX2 RET Auxiliary Output Return Connection
ENVIRONMENTAL SCREENING
Screening Condition Standard
(No Suffix) Military
/ML
Pre-Cap Inspection IPC-A-610 Class II • •
Temperature Cycling -55°C, 100°C, 10 Cycles •
Burn-In 96 hours at +100°C
12 hours at +100°C
•
•
Final Electrical 100% at -55°C, 25°C, 100°C1
100% at 25°C
•
•
Final Inspection MIL-STD-883, Test Method 2009 • •
DVST2800T Series
DS90054E 12
ORDERING INFORMATION
DVST 28 5 15 15 T /ML - XXX
1 2 3 4 5 6 7 8 9
(1) (2) (3) (4) (5)
Product Series Nominal Input
Voltage Main Output Auxiliary
Output 1 Auxiliary
Output 2
DVST
28
28 Volts
1R8
3R3
5
6R25
12
1.8 Volts
3.3 Volts
5 Volts
6.25 Volts
12 Volts
3R3
5
12
15
3.3 Volts
5 Volts
12 Volts
15 Volts
5
12
15
5 Volts
12 Volts
15 Volts
(6) (7) (8) (9)
Number of Outputs Package Option Screening Code1 Additional Screening
Code
T
Triple
None
Standard
None
/ML
Standard
Military
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, or packaging requirements.
DVST2800T Series
DS90054E 13
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.
