DVFL2800D
DVFL2800D
The DVFL series of DC-DC converters are designed for high-reliability applications, suitable for military operations with a temperature range of -55°C to +125°C. These converters feature noise-reducing filters, operate at 450 kHz, and include magnetic feedback and under-voltage lockout.
- High reliability with parallel operation for up to 5 units with current sharing.
- Output voltage trim capability of +10% or -20%.
- Wide input voltage range of 16 to 40 volts, compliant with MIL-STD-704.
- Output power up to 120 watts with fault-tolerant feedback.
- Protection against short circuits and current limits.
- Hermetic package with high power density (> 80 W/in³).
- Compliance with MIL-STD-461 EMC requirements with VPT’s EMI filters.
Operating conditions include a case temperature range of -55°C to +125°C and an input voltage of +28V ± 5%. The converters can handle a maximum continuous input voltage of 40 VDC and a transient input voltage of 50 volts for 1 second. The output power is rated at 120 watts, with a maximum weight of 90 grams.
- Load step output transient and recovery times are specified.
- Turn-on delay and overshoot are controlled within limits.
Includes block and connection diagrams for various configurations, including isolated inhibit drive and EMI filter hookup.
The output voltage can be adjusted via the TRIM pin, with a range of +10% to -20%. A table provides resistor values for different voltages.
The document includes technical specifications, performance curves, package drawings, and ordering information for the DVFL2800D Series, covering efficiency, cross-regulation, EMI performance, and environmental screening.
Efficiency is measured at input voltages of 16V, 28V, and 40V, with efficiency ranging from 73% to 87% depending on conditions.
These curves illustrate the relationship between output voltage and current under various load conditions, with data for models like DVFL2805D, DVFL286R3D, DVFL289R5D, and DVFL2812D.
EMI performance is evaluated with and without an EMI filter at 25°C and 28V ± 5% input voltage.
Standard and flanged package drawings are provided, detailing dimensions and pin functions. Materials include steel, Kovar, and copper-cored alloy.
Functions of each pin are listed, including 28V IN, IN COM, CASE, SYNC IN/OUT, +V OUT, -V OUT, TRIM, and SHARE.
Products are tested per MIL-STD-883 and MIL-PRF-38534 standards, including temperature cycling, constant acceleration, burn-in, and hermeticity.
The ordering code structure is explained, detailing product series, input/output voltage, package options, and screening codes.
Standard Microcircuit Drawing numbers are provided for reference, with a note to refer to the SMD drawing for exact specifications.
For quotations or orders, contact VPT Inc. Sales Department via phone, fax, or email.
Catalog excerpts
DVFL2800D SeriesHIGH RELIABILITY HYBRID DC-DC CONVERTERS DESCRIPTION The DVFL 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 DVFL 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 • Parallel Up to 5 Units With Current Sharing • Output Voltage Trim Up +10% or Down -20% • Wide Input Voltage Range: 16 to 40 Volts per MIL-STD-704 • Up to 120 Watts Output Power • Fault Tolerant Magnetic Feedback Circuit • NO Use of Optoisolators • Undervoltage Lockout • Indefinite Short Circuit Protection • Current Limit Protection • Industry Standard Pinout • Input Transient Voltage: 50 Volts for 1 second • Precision Seam Welded Hermetic Package • High Power Density: > 80 W/in3 • Custom Versions Available • Additional Environmental Screening Available • Meets MIL-STD-461 EMC Requirements When Used With VPT’s EMI Filters • MIL-PRF-38534 Element Evaluated Components • Space Applications should consider VPT’s "S” Series of Radiation Tolerant Power Conversion Devices. Contact VPT for details. Figure 1 - DVFL2800D - Exact marking may differ from that shown Sales Information: Phone: (425) 353-3010 Fax: (425) 353-4030 E-mail: vptsales@vptpow
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DVFL2800D SeriesSPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS 1. Dependent on output voltage. 2. Time for output voltage to settle within 1% of its nominal value. 4. Verified by initial electrical design verification. Post design verification, parameter shall be guaranteed to the limits specified. 5. Both outputs at half load. 6. Up to 70% of the total power or current can be drawn from any one of the two outputs. 7. 5% load to full load at -55 °C. 8. Correction factor of 0.12 added to ceramic capacitors.
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DVFL2800D SeriesSPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS 1. Dependent on output voltage. 2. Time for output voltage to settle within 1% of its nominal value. 4. Verified by initial electrical design verification. Post design verification, parameter shall be guaranteed to the limits specified. 5. Both outputs at half load. 6. Up to 70% of the total power or current can be drawn from any one of the two outputs. 7. 5% load to full load at -55 °C. 8. Correction factor of 0.12 added to ceramic capacitors.
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See notes on the next page.
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DVFL2800D SeriesSPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS 1. Dependent on output voltage. 2. Time for output voltage to settle within 1% of its nominal value. 4. Verified by initial electrical design verification. Post design verification, parameter shall be guaranteed to the limits. 5. Both outputs at half load. 6. Up to 70% of the total power or current can be drawn from any one of the two outputs. 7. 5% load to full load at -55 °C. 8. Correction factor of 0.12 added to ceramic capacitors.
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DVFL2800D Series BLOCK DIAGRAM PIN 7 +V OUT PIN 8 OUT COM UNDER VOLTAGE SHUTDOWN VOLTAGE AND CURRENT AMPLIFIERS SHARE PIN 11 INH2 PRIMARY HOUSEKEEPING SUPPLY SECONDARY HOUSEKEEPING SUPPLY
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DVFL2800D Series INHIBIT DRIVE CONNECTION DIAGRAM 28V IN 1 30K OPTOISOLATOR OPTIONAL CAPACITOR Figure 4 – Isolated Inhibit Drive and Internal Equivalent Circuit (Shown with optional capacitor for turn-on delay) EMI FILTER HOOKUP DIAGRAM Figure 5 – Converter with EMI Filter
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DVFL2800D Series +28 VOLT OUTPUT CONNECTION DIAGRAM Figure 6: +28 Volt Output Converter Using DVFL2815D Converter
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DVFL2800D Series PARALLEL CONNECTION DIAGRAM Figure 7 – Current Sharing Parallel Connection for Multiple Converters
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The output voltage can be trimmed down by connecting a resistor between the TRIM pin (PIN 10) and the +V OUT pin (PIN 7), or can be trimmed up by connecting a resistor between the TRIM pin (PIN 10) and the OUT COM pin (PIN 8). 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.
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DVFL2800D 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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DVFL2800D Series EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) VIN = 16V Figure 13 – DVFL2815D Efficiency (%) vs. Output Power (W)
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DVFL2800D Series CROSS REGULATION CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) +Io = 10%
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DVFL2800D Series CROSS REGULATION CURVES (Tcase = 25°C, Full Load, Unless Otherwise Specified)
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DVFL2800D Series EMI PERFORMANCE CURVES (TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified) Figure 19 – DVFL2800D without EMI Filter Figure 20 – DVFL2800D with EMI Filter
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DVFL2800D Series STANDARD PACKAGE DRAWINGS 3.005 76.33 MAX BASEPLATE SURFACE (BOTTOM) 1. Tolerances are ±0.005” unless otherwise stated. 2. Case temperature is measured on the center of the baseplate surface. 3. Mounting holes are not threaded. Recommended fastener is 4-40. 4. Product Materials: Case (Steel, gold over nickel plated); Cover (Kovar, nickel plated); Pin (Copper-cored alloy 52, gold over nickel plated); Pin Seals (Glass). Figure 21 – Standard Package and Pinout
Open the catalog to page 18All VPT INC. catalogs and technical brochures
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