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VPT INC.
DVHF2800S

DVHF2800S

Product catalog summary

Overview
The DVHF series of high-reliability DC-DC converters are designed for critical mission support, operable over the full military temperature range (-55°C to +125°C) without power derating. They feature unique input and output filters to reduce noise and operate at a fixed frequency of 450 kHz. These converters are manufactured in an ISO9001 qualified facility and certified to MIL-PRF-38534 and MIL-STD-883 standards.

Key Features

High reliability with very low output noise.
Wide input voltage range (15 to 50 Volts) compliant with MIL-STD-704.
Up to 20 Watts output power with a fault-tolerant magnetic feedback circuit.
No use of optoisolators, undervoltage lockout, and indefinite short circuit protection.
High input transient voltage tolerance (80 Volts for 1 sec) per MIL-STD-704A.
Precision projection welded hermetic package and high power density (> 37 W/in³).
Custom versions and additional environmental screening available.
Meets MIL-STD-461 EMC requirements with VPT’s EMI filters.
Available in flanged and non-flanged versions.

Specifications

Input Voltage: Continuous 50 VDC, Transient 80 Volts.
Output Power: 20 Watts, Power Dissipation: 6 Watts.
Efficiency ranges from 57% to 85% depending on the model.
Switching Frequency: 350 to 500 kHz.
Isolation: 500 VDC, MTBF: 712 kHrs at 55°C.

Performance
Efficiency performance curves are provided for various models, showing efficiency percentages against output power at different input voltages (16V, 28V, 40V). Efficiency ranges from 65% to 90% as output power increases from 0 to 20 watts.

Diagrams
Block diagrams and connection diagrams illustrate the internal structure and recommended setups for the converters, including inhibit drive and EMI filter hookup.

EMI Performance
Figures illustrate the EMI performance curves for the DVHF2800S series with and without an EMI filter, under specified conditions.

Package Specifications
Two types of package specifications are provided: non-flanged and flanged. Dimensional limits are ±0.005 inches, and the case temperature is measured at the center of the baseplate. Materials used include steel with gold over nickel plating for the case and cover, and alloy 52 with gold over nickel plating for the pins.

Pin Descriptions
The document details pin functions for all outputs except DVHF2828S and for DVHF2828S specifically. Key functions include INHIBIT, OUT COM, +V OUT, and 28V IN.

Environmental Screening
The DVHF2800S series undergoes various tests per MIL-STD-883, including non-destructive bond pull, internal visual inspection, temperature cycling, constant acceleration, and burn-in tests. Different screening levels are available, such as Standard, Extended, Class H, and Class KL1.

Ordering Information
The ordering code structure is explained, detailing product series, nominal input voltage, output voltage, number of outputs, package option, and screening code. Customers are advised to contact sales for specific requirements.

SMD Numbers
Standard Microcircuit Drawing (SMD) numbers are provided for various DVHF2800S series models. Customers are advised to refer to the SMD drawing for exact specifications.

Contact Information
For quotations or orders, contact the VPT Inc. Sales Department via phone, fax, or email.

Catalog excerpts

DVHF2800S SeriesHIGH RELIABILITY HYBRID DC-DC CONVERTERS DESCRIPTION The DVHF series of high-reliability DC-DC converters provide decades of successful critical mission support. Operable over the full military (-55 °C to +125 °C) temperature range with no power derating, the DVSA series unique input, and output filters dramatically reduce input and output noise performance. While operating at a nominal fixed frequency of 450 kHz, these regulated, isolated units utilize a high-speed magnetic feedback design and well-controlled under-voltage 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 20 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 • Precision Projection Welded Hermetic Package • High Power Density: > 37 W/in3 • 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 Components • Space Applications should consider VPT’s "S” Series of Radiation Tolerant Power Conversion Devices. Contact VPT for details. Sales Information: Phone: (425) 353-3010 Fax: (425) 353-4030 E-mail: [email protected]

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DVHF2800S SeriesSPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS Notes: 1. Dependent on output voltage. 2. Time for output voltage to settle within 1% of its nominal value. 3. Derate linearly to 0 at 135°C. 4. Verified by initial electrical design verification. Post design verification, parameter shall be guaranteed to the limits specified. 5. Correction factor of 0.12 added to ceramic capacitors.

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DVHF2800S Series BLOCK DIAGRAM PIN 8 UNDER VOLTAGE SHUTDOWN VOLTAGE AND CURRENT AMPLIFIERS PRIMARY HOUSEKEEPING SUPPLY SECONDARY HOUSEKEEPING SUPPLY CONNECTION DIAGRAM

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DVHF2800S Series INHIBIT DRIVE CONNECTION DIAGRAMS OPTIONAL CAPACITOR 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) EMI FILTER HOOKUP DIAGRAM DVMH28 EMI FILTER 1 Figure 6 – Converter with EMI Filter

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DVHF2800S Series EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) VIN = 16V Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)

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DVHF2800S Series EMI PERFORMANCE CURVES (TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified) Figure 15 – DVHF2800S without EMI Filter Figure 16 – DVHF2800S with EMI Filter

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Dimensional limits are ±0.005” unless otherwise specified. Case temperature is measured on the center of the baseplate. Material: Case (Steel, Gold over Nickel Plated), Cover (Steel, Nickel Plated), Pins (Alloy 52, Gold over Nickel Plated), Pin Seal (Glass). *Pin 3 of DVHF2828S provides a +14V output referenced to OUT COM. Figure 17 - Non-Flanged Package and Pinout

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DVHF2800S

DVHF2800S

Catalog excerpts

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