DVFL2800D
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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

See notes on the next page.

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.

See notes on the next page.

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.

See notes on the next page.

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.

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

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

DVFL2800D Series +28 VOLT OUTPUT CONNECTION DIAGRAM Figure 6: +28 Volt Output Converter Using DVFL2815D Converter

DVFL2800D Series PARALLEL CONNECTION DIAGRAM Figure 7 – Current Sharing Parallel Connection for Multiple Converters

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.

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)

DVFL2800D Series EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) VIN = 16V Figure 13 – DVFL2815D Efficiency (%) vs. Output Power (W)

DVFL2800D Series CROSS REGULATION CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) +Io = 10%

DVFL2800D Series CROSS REGULATION CURVES (Tcase = 25°C, Full Load, Unless Otherwise Specified)

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

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