DVAB2800D
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DVAB2800D SeriesHIGH RELIABILITY HYBRID DC-DC CONVERTERS DESCRIPTION The DVAB 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 DVAB series are independent dual control loops which provide tight regulation and zero cross regulation error while maintaining high efficiency. Operating at a nominal fixed frequency of 325 kHz, per stage, 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 • Dual Outputs with Zero Cross Regulation Error • Up to 15 Watts Output Power • High Input Transient Voltage: 80 Volts for 1 sec per MIL-STD-704A • Fault Tolerant Magnetic Feedback Circuit • NO Use of Optoisolators • Undervoltage Lockout • Short Circuit Protection • Current Limit Protection • Precision Projection Welded Hermetic Package • High Power Density • Custom Versions Available • Additional Environmental Screening Available • Meets MIL-STD-461 Revisions C, D, E and F EMC Requirements When Used With VPT’s EMI Filters • Flanged and Non-flanged Versions Available. • MIL-PRF-38534 Element Evaluated Sales Information: Phone: (425) 353-3010 Fax: (425) 353-4030 E-mail: vptsales@vptpower.com

2. Synchronization is TTL signal with Vsync max = 6V. 3. Time for output voltage to settle within 1% of its nominal value. 4. Verified by qualification testing. 5. Correction factor of 0.12 added to ceramic capacitors.

2. Synchronization is TTL signal with Vsync max = 6V. 3. Time for output voltage to settle within 1% of its nominal value. 4. Verified by qualification testing. 5. Correction factor of 0.12 added to ceramic capacitors.

DVAB2800D Series BLOCK DIAGRAM 28V IN PRIMARY HOUSEKEEPING SUPPLY TRANSFORMER ISOLATED ERROR SIGNAL FEEDBACK VOLTAGE ERROR AMPLIFIERS TRANSFORMER ISOLATED POWER FEEDFORWARD SECONDARY HOUSKEEPING SUPPLY

DVAB2800D Series CONNECTION DIAGRAM INHIBIT DRIVE CONNECTION DIAGRAMS BIAS OPTIONAL CAPACITOR IN COM 8 BIAS OPTIONAL CAPACITOR 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)

DVAB2800D Series EMI FILTER HOOKUP DIAGRAM Figure 6 – Converter with EMI Filter

DVAB2800D Series EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) VIN = 15V Figure 7 – DVAB2805D Efficiency (%) vs. Output Power (W) Figure 8 – DVAB2812D Efficiency (%) vs. Output Power (W) Figure 9 – DVAB2815D Efficiency (%) vs. Output Power (W)

1. DIMENSIONAL LIMITS ARE +0.005' UNLESS OTHERWISE STATED. 2. CASE TEMPERATURE IS MEASURED ON THE CENTER OF THE BASEPLATE. 3. MATERIALS) CASE; STEEL, GOLD OVER NICKEL PLATED. COVER; STEEL, NICKEL PLATED, PINS) ALLOY 52, GOLD OVER NICKEL PLATED. PIN SEALS) GLASS Figure 10 - Non-Flanged Package and Pinout

Figure 11 - Flanged Package and Pinout

DVAB2800D Series ENVIRONMENTAL SCREENING (100% Tested Per MIL-STD-883 as referenced to MIL-PRF-38534) Test © Contact Sales for more information conceming additional environmental screening and testing options desired. © VPT Inc. reserves the right to ship higher screened or SMD products to meet lower screened orders at our sole discretion unless specifically forbidden by customer contract. © 100% R&R testing with all test data included in product shipment. © Not required per MIL-PRF-38534. Test is performed for additional product quality assurance. © Non-QML products may not meet all...

DVAB2800D Series ORDERING INFORMATION Notes: 1. VPT Inc. reserves the right to ship higher screened or SMD 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.

DVAB2800D SeriesSMD (STANDARD MICROCIRCUIT DRAWING) NUMBERS Standard Microcircuit Drawing (SMD) Do not use the DVAB2800D Series similar part number for SMD product acquisition. It is listed for reference only. For exact specifications for the SMD product, refer to the SMD drawing. SMDs can be downloaded from the DLA Land and Maritime (Previously known as DSCC) website at https://landandmaritimeapps.dla.mil/programs/defaultapps.asp. The SMD number listed above represents the Federal Stock Class, Device Type, Device Class Designator, Case Outline, Lead Finish and RHA Designator (where...

DVAB2800D Series 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 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.