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VPT INC.
DVTR2800S

DVTR2800S

Product catalog summary

Overview
The DVTR series of DC-DC converters are designed for high-reliability applications, suitable for operation across the full military temperature range (-55°C to +125°C) without power derating. These converters include unique input and output filters to minimize noise, operate at a fixed frequency of 450 kHz, and feature high-speed magnetic feedback and under-voltage lockout circuitry.

Key Features

High reliability with very low output noise.
Wide input voltage range (15 to 50 Volts) compliant with MIL-STD-704.
Output power capability up to 40 Watts.
Fault-tolerant magnetic feedback circuit without optoisolators.
Indefinite short circuit and current limit protection.
High input transient voltage tolerance (80 Volts for 1 second).
Precision seam seal hermetic package with high power density (> 40 W/in³).
Custom versions and additional environmental screening available.
Compliance with MIL-STD-461 EMC requirements when used with VPT’s EMI filters.
Available in flanged and non-flanged versions.

Specifications
Absolute Maximum Ratings

Continuous input voltage: 50 VDC.
Transient input voltage (1 second): 80 Volts.
Output power: 40 Watts.
Storage temperature: -65°C to +150°C.
Lead solder temperature (10 seconds): 270°C.

Static Input and Output Parameters

Continuous input voltage range: 15 to 50 V.
Output voltage varies by model, e.g., DVTR282R5S outputs 2.5V, DVTR2805S outputs 5V, etc.
Efficiency ranges from 63% to 84% depending on the model.

Dynamic Performance

Load step output transient and recovery times are specified for various models.
Turn-on delay and overshoot are controlled within specified limits.

Additional Specifications
The DVTR2800S series operates within a frequency range of 500 - 600 kHz and provides isolation at 500 VDC with a minimum insulation resistance of 100 MΩ. The Mean Time Between Failures (MTBF) is rated at 552 kHrs at 55°C.

Performance Details
Dynamic Performance

Load step output transients range from 850 to 1200 mVPK, with recovery times between 250 to 400 μSec.
Line step output transients range from 1500 to 2800 mVPK, with recovery times between 350 to 600 μSec.
Turn-on delay is between 10 to 20 mSec with a maximum overshoot of 50 mVPK.

Efficiency Performance
Efficiency curves are provided for different input voltages (16V, 28V, 40V) and output power levels, showing efficiency percentages across various models.

Design and Configuration
Block Diagram
The block diagram includes components such as under-voltage shutdown, PWM control, voltage and current amplifiers, and primary and secondary housekeeping supplies.
Connection and Inhibit Drive Diagrams
Detailed connection diagrams are provided for standard and isolated inhibit drive configurations, including optional capacitors for turn-on delay.
Output Voltage Trim
The output voltage can be adjusted by connecting a resistor between specific pins, with a maximum trim range of +10%.

Compliance and Testing
EMI Performance
EMI performance curves are shown with and without EMI filters, indicating the impact on performance.
Environmental Screening
The document outlines various tests conducted per MIL-STD-883, including temperature cycling, constant acceleration, and burn-in tests.

Ordering and Contact Information
Ordering Information
The ordering code structure is explained, detailing product series, input/output voltages, package options, and screening codes.
Contact Information
For quotations or orders, contact VPT Inc. Sales Department via phone, fax, or email.

Catalog excerpts

DVTR2800S SeriesHIGH RELIABILITY HYBRID DC-DC CONVERTERS DESCRIPTION The DVTR 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 DVTR 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 40 Watts Output Power • Fault Tolerant Magnetic Feedback Circuit • Output Voltage Trim Up +10% • 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 Seam Seal Hermetic Package • High Power Density: > 40 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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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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DVTR2800S Series BLOCK DIAGRAM PIN 1 UNDER VOLTAGE SHUTDOWN PRIMARY HOUSEKEEPING SUPPLY VOLTAGE AND CURRENT AMPLIFIERS SECONDARY HOUSEKEEPING SUPPLY CONNECTION DIAGRAM

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DVTR2800S 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 Figure 6 – Converter with EMI Filter

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The output voltage can be trimmed up by connecting a resistor between the +S pin (PIN 6) and the OUT COM pin (PIN 4). The maximum trim range is +10%. The appropriate resistor values versus the output voltage are given in the trim table below. The -S pin should be connected to the OUT COM pin. (Continued on next page)

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Notes: 1. Connect R-TRIM = 400Q from +VOUT (PIN 5) to +S (PIN 6).

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DVTR2800S 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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DVTR2800S Series EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) VIN = 16V Efficiency (%) vs. Output Power (W) Efficiency (%) vs. Output Power (W)

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DVTR2800S Series EMI PERFORMANCE CURVES (TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified) Figure 18 – DVTR2800S without EMI Filter Figure 19 – DVTR2800S with EMI Filter

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Figure 20 - Non-Flanged, Seam Seal Package and Pinout

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Figure 21 - Flanged, Seam Seal Package and Pinout

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DVTR2800S SeriesENVIRONMENTAL SCREENING (100% Tested Per MIL-STD-883 as referenced to MIL-PRF-38534) Test 1. Contact Sales for more information concerning additional environmental screening and testing options desired. 2. 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. 3. 100% R&R testing with all test data included in product shipment. 4. Not required per MIL-PRF-38534. Test is performed for additional product quality assurance. 5. Non-QML products may not meet all requirements...

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DVTR2800S

DVTR2800S

Catalog excerpts

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