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4.0 SALES INFORMATION: phone (425) 353-3010 • fax (425) 353-4030 • vptsales@vptpower.com • www.vptpower.com 1 VPT250-2800S SERIES HIGH RELIABILITY COTS DC-DC CONVERTERS Models Available Input: 16 V to 40 V continuous, 50 V transient 250 W, single output of 3.3 V, 5 V, 12 V, 15 V -55 °C to 100 °C Operation

1.0 DESCRIPTION

The VPT250 series of isolated COTS DC-DC converters is a cost effective solution for many demanding high reliability applications. A wide input voltage range accommodates nominal 28V inputs including avionics, mobile, ground systems, and other applications. A high efficiency design using synchronous rectification reduces input power requirements and eases thermal management. Low input and output ripple, fixed operating frequency, and current sharing capability simplify system design and compliance. A proven design heritage, no optoisolators and a rugged epoxy encapsulated package ensure long term reliability. The VPT250 series is intended for harsh environments including severe vibration, shock and temperature cycling. Testing is to JESD22, MIL-STD-810, and MIL-STD-883. These converters are designed and manufactured in the USA in a facility certified to ISO9001, J-STD-001 and IPC-A-610. 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

1.1 FEATURES

  • High Reliability at Low Cost
  • Parallel Up to 5 Units With Current Sharing
  • Up to 250 Watts Maximum Output Power
  • High Efficiency, Up to 92%
  • Wide Input Voltage Range: 16 to 40 Volts per MIL-STD-704 and MIL-STD-1275
  • High Input Transient Voltage: 50 Volts for 1 second
  • Input Undervoltage Lockout
  • Fixed Frequency
  • Output Voltage Trim (+10% / -20% )
  • Current Limit Protection
  • Short Circuit Protection
  • Magnetic Feedback, no Optoisolators
  • Wide Temperature Range, -55 °C to 100 °C
  • Internally Conformal Coated
  • 2000 V Isolation
  • Rugged Epoxy Encapsulated V-SHIELD® Package
  • Fully compatible with Aqueous cleaning process

1.2 COMPLIANCE

  • MIL-STD-1275
  • MIL-STD-704

1.3 PACKAGING

  • Low-profile: 2.33” x 2.45” x 0.410”
  • Max weight: 118 g

1.4 SIMILAR PRODUCTS AND ACCESSORIES

  • DV200 200 W isolated DC-DC converter
  • EMI filters, Thermal Pads, Front-End Modules and Accessories

VPT250 -2800S SERIES DATASHEET 4.0 SALES INFORMATION: phone (425) 353-3010 • fax (425) 353-4030 • vptsales@vptpower.com • www.vptpower.com 2

2.0 DESCRIPTION

2.1 BLOCK DIAGRAM

2.2 CONNECTION DIAGRAM

Inhibit Circuit (Shown with optional capacitor for turn-on delay) Output Voltage Trim Circuit

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2.3 PARALLEL CONNECTION DIAGRAM

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3.0 SPECIFICATIONS

3.1 ABSOLUTE MAXIMUM RATINGS

Input Voltage (Continuous) : 40 V Operating Temperature (Full Load): -40 ° C to 100 ° C Input Voltage (Transient, 1 second) : 50 V Storage Temperature : -55 ° C to 125 ° C Lead Solder Temperature (10 seconds) : 300 ° C

3.2 PERFORMANCE SPECIFICATIONS

Tcase = -55 °C to 100 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified VPT250-283R3S VPT250-2805S Parameter Conditions Min Typ Max Min Typ Max Units INPUT Voltage Continuous 16 28 40 16 28 40 V Transient, 1 sec 3 - - 50 - - 50 V Current INH < 1.5 V - 3.5 5 - 3.5 5 mA No Load - 190 350 - 190 425 mA Ripple Current 20 Hz to 10 MHz - 300 500 - 500 700 mAp -p OUTPUT STATIC Power 2 0 - 165 0 - 250 W Current 2 0 - 50 0 - 50 A Ripple Voltage 4 20 Hz to 10 MHz - - 150 - - 150 mVp-p Line Regulation Vin = 16 V to 40 V - - 20 - - 20 mV Load Regulation No Load to Full Load - - 50 - - 50 mV Load Fault Power Dissipation Overload 3 - - 50 - - 50 W Short Circuit 3 - - 50 - - 50 W OUTPUT DYNAMIC Load Step, 3/4 to Full Load Output Transient - 260 400 - 260 400 mV pk Recovery 1 - 250 500 - 250 500 µs Line Step 3, Vin = 16 V to 40 V Output Transient - 500 750 - 500 750 mVpk Recovery 1 - 300 500 - 300 500 µs Turn On, Vin = 0 to 28 V Delay - 5 10 - 5 10 ms Overshoot - 0 25 - 0 25 mV pk FUNCTION INH Pin Input 3 Output Inhibited 0 - 1.5 0 - 1.5 V INH Pin Open Circuit Voltage 3 Output Enabled 9 11 14 9 11 14 V SHARE Pin Voltage 3 0 - 5 0 - 5 V Current Share Accuracy 3 - 5 - - 5 - % SYNC Frequency Range VH - VL= 5 V, D = 50% 264 - 336 264 - 336 kHz GENERAL Efficiency 85 88 - 87 90 - % Capacitive Load 3 - - 8,000 - - 8,000 µF Switching Frequency 264 300 336 264 300 336 kHz Isolation 2000 V DC, Tcase = 25 ° C 100 - - 100 - - MΩ Weig ht - - 118 - - 118 g MTBF (MIL -HDBK -217F) GM @ Tcase = 55 ° C - 316 - - 316 - kHrs 1. Time for output voltage to settle within 1% of i ts nominal value. 2. Derate linearly to 0 at 110° C. 3. Verified by initial electrical design verificati on. Post design verification, parameter shall be gu aranteed to the limits specified. 4. Using recommended minimum external capacitance o f 1.0 µF.

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3.2 PERFORMANCE SPECIFICATIONS (CONTINUED)

Tcase = -55 °C to 100 °C, Vin = +28 V ± 5%, Full Load, Unless Otherwise Specified VPT250-2812S VPT250-2815S Parameter Conditions Min Min Min Min Typ Max Units INPUT Voltage Continuous 16 28 40 16 28 40 V Transient, 1 sec 3 - - 50 - - 50 V Current INH < 1.5 V - 3.5 5 - 3.5 5 mA No Load - 190 425 - 190 425 mA Ripple Current 20 Hz to 10 MHz - 500 700 - 500 700 mAp -p OUTPUT STATIC Voltage Tcase = 25 ° C 3.25 12 3.35 4.92 15 5.08 V Tcase = -55 ° C to 100 ° C 3.22 12 3.38 4.87 15 5.13 V Power 2 0 - 250 0 - 250 W Current 2 0 - 20.8 0 - 16.7 A Ripple Voltage 4 20 Hz to 10 MHz - - 150 - - 150 mVp-p Line Regulation Vin = 16 V to 40 V - - 50 - - 50 mV Load Regulation No Load to Full Load - - 100 - - 100 mV Load Fault Power Dissipation Overload 3 - - 50 - - 50 W Short Circuit 3 - - 50 - - 50 W OUTPUT DYNAMIC Load Step , 3/4 to Full Load Output Transient - 390 700 - 390 700 mV pk Recovery 1 - 250 500 - 250 500 µs Line Step 3, Vin = 16 V to 40 V Output Transient - 800 1200 - 800 1200 mVpk Recovery 1 - 300 500 - 300 500 µs Turn On , Vin = 0 to 28 V Delay - 5 10 - 5 10 ms Overshoot - 0 50 - 0 50 mV pk FUNCTION INH Pin Input 3 Output Inhibited 0 - 1.5 0 - 1.5 V INH Pin Open Circuit Voltage 3 Output Enabled 9 11 14 9 11 14 V SHARE Pin Voltage 3 0 - 5 0 - 5 V Current Share Accuracy 3 - 5 - - 5 - % SYNC Frequency Range VH - VL= 5 V, D = 50% 264 - 336 264 - 336 kHz GENERAL Efficiency 89 92 - 89 92 - % Capacitive Load 3 - - 1500 - - 1500 µF Switching Frequency 264 300 336 264 300 336 kHz Isolation 2000 V DC, Tcase = 25 ° C 100 - - 100 - - MΩ Weig ht - - 118 - - 118 g MTBF (MIL -HDBK -217F) GM @ Tcase = 55 ° C - 316 - - 316 - kHrs 1. Time for output voltage to settle within 1% of i ts nominal value. 2. Derate linearly to 0 at 110 ° C. 3. Verified by initial electrical design verificati on. Post design verification, parameter shall be gu aranteed to the limits specified. 4. Using recommended minimum external capacitance o f 1.0 µF.

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4.0 PERFORMANCE CURVES

Tcase = 25° C, Full Load, Unless Otherwise Specified

4.1 EFFICIENCY PERFORMANCE CURVES

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5.0 MECHANICAL OUTLINES AND PINOUT

Standard Package: 1. Case temperature is measured on the center of th e baseplate surface. 2. Materials: Baseplate (Aluminum, conductive conve rsion coating); Cover (Nickel Plated); Pins (Copper , gold over nickel plating) 3. Mounting holes are not threaded. Recommended fas tener is 4-40 4. This Package is not hermetic. VPT offers a wide range of hermetic products. Please contact VPT for details if hermetic products are required. Pin Function Pin Function 1 28VIN 7 -SENSE

2 INHIBIT 8 SHARE

3 SYNC 9 TRIM

4 CASE 10 +SENSE

5 INCOM 11 +VOUT

6 OUTCOM

0.079in±0.002 2mm±0.05 7X PIN 0.039in±0.002 1mm±0.05 0in 0mm 0.300in 7.62mm 0.400in 10.16mm 0.600in 15.24mm 0.700in 17.78mm 0.800in 20.32mm 1.000in 25.40mm 1.400in 35.56mm 5 6 1.900in 48.26mm 2.330in 59.18mm MAX 2.000in 50.80mm 2.450in 62.23mm MAX 4X MOUNTING HOLE 0.130in + 0.010 0.005 3.30mm + 0.25 0.13 BASEPLATE SURFACE 0.230in±0.015 5.84mm±0.38 0.410in±0.010 10.41mm±0.25

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6.0 PACKAGE PIN DESCRIPTION

1 28VIN Positive Input Voltage Connection 2 INHIBIT This is an open collector input. Logic Low = Disabl ed Output. Connect the inhibit pin to input common to disable the output. Unconnected, open collector or open drain = Enabled Output. 3 SYNC Input Synchronization Signal. TTL squarewave , 5 Vpp, 20 - 80% duty cycle, internally capacitive ly coupled.

4 CASE Case Connection

5 INCOM Input Return Connection

6 OUTCOM Output Return Connection

7 -SENSE Output Return Remote Sense. Compensate for up to 0.5 V total drop (positive and return).

8 SHARE Current Share Connection

9 TRIM Trim Output Voltage to +10%, -20% of Nominal Value. Leave open if not used. 10 +SENSE Positive Output Voltage Remote Sense. Com pensate for up to 0.5 V total drop (positive and re turn). 11 +VOUT Positive Output Voltage Connection

7.0 OUTPUT VOLTAGE TRIM

The output voltage can be trimmed down by connecting a resistor between the TRIM pin and the +VOUT pin, or can be trimmed up by connecting a resistor between the TRIM pin and the OUTCOM pin as shown in Section 2.2. The maximum trim range is +10% up and –20% down. The appropriate resistor values versus the output voltage are given in the trim table below. VPT250 -283R3S VPT250 -2805S VPT250 -2812S VPT250 -2815S +Vout (V) Rtrim ( Ω) + Vout (V) Rtrim ( Ω) + Vout (V) Rtrim ( Ω) + Vout (V) Rtrim ( Ω) 3.25 486k 4.8 189k 11.8 548k 14.75 552k 3.20 226k 4.7 118k 11.6 266k 14.50 270k 2.65 8.26k

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8.0 ENVIRONMENTAL SCREENING

Internal Visual IPC-A-610, Class 3 Stabilization Bake MIL-STD-883, Method 1008, Condit ion B, 125° C, 24 hours Temperature Cycling MIL-STD-883, Method 1010, Condi tion B, -55° C to +125° C, 10 Cycles Burn-In 96 hours at +100° C Final Electrical 100% at 25 ° C External Visual Internal Procedure

9.0 ORDERING INFORMATION

(1) Product Series (2) Nominal Input Voltage (3) Output Voltage (4) Number of Outputs VPT250-

28 Volts

3.3 Volts

5 Volts

12 Volts

15 Volts

S Single 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 requirements, and source inspection.

10.0 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@vptpower.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. VPT, its logo and tagline are registered trademarks in the U.S. Patent and Trademark Office.

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11.0 ADDITIONAL INFORMATION

Visit the VPT website for additional technical resources, including: Product Literature Application Notes and White Papers Technical Video Labs Additional Products For Avionics/Military , Hi-Temp , Hi-Rel COTS , and Space Applications