DVHF+2800T 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 DVHF 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 15 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 Sales Information: Phone: (425) 353-3010 Fax: (425) 353-4030 E-mail: [email protected]

SPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS

DVHF+2800T SeriesSPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS 1. This note intentionally not used. 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. 6. Up to 70% of the total auxiliary power or current can be drawn from either of the auxiliary outputs. 7. Synchronization is TTL signal with Vsync max = 6V. 8. -Vaux is 5% Load to Full Load at -55°C. 9. Correction factor...

SPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS

DVHF+2800T SeriesSPECIFICATIONS (Tcase = -55°C to +125°C, Vin = +28V ± 5%, Full Load5, Unless Otherwise Specified) ABSOLUTE MAXIMUM RATINGS 1. This note intentionally not used. 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. 6. Up to 70% of the total auxiliary power or current can be drawn from either of the auxiliary outputs. 7. Synchronization is TTL signal with Vsync max = 6V. 8. -Vaux is 5% Load to Full Load at -55°C. 9. Correction factor...

DVHF+2800T Series BLOCK DIAGRAM PRIMARY HOUSEKEEPING SUPPLY TRANSFORMER ISOLATED ERROR SIGNAL FEEDBACK VOLTAGE ERROR AMPLIFIERS TRANSFORMER ISOLATED POWER FEEDFORWARD SECONDARY HOUSKEEPING SUPPLY

DVHF+2800T 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)

DVHF+2800T Series EMI FILTER HOOKUP DIAGRAM Figure 6 – Converter with EMI Filter

DVHF+2800T Series EFFICIENCY PERFORMANCE CURVES (TCASE = 25°C) VIN = 15V Figure 7 – DVHF+28512T Efficiency (%) vs. Output Power (W) Figure 8 – DVHF+28515T Efficiency (%) vs. Output Power (W)

DVHF+2800T Series CROSS REGULATION CURVES (TCASE = 25°C, Full Load, Unless Otherwise Specified) +Iaux = 10% Figure 9 – DVHF+28x12T -Vaux (V) vs. -Iaux (A) Figure 10 – DVHF+28x15T -Vaux (V) vs. -Iaux (A)

DVHF+2800T Series EMI PERFORMANCE CURVES (TCASE = 25°C, VIN = +28V ± 5%, Full Load, Unless Otherwise Specified) Figure 11 – DVHF+2800T without EMI Filter Figure 12 – DVHF+2800T with EMI Filter

DVHF+2800T SeriesPACKAGE SPECIFICATIONS (NON-FLANGED) NDTESi 1. DIMENSIONAL LIMITS ARE +0.005' UNLESS OTHERWISE STATED. 2. CASE TEMPERATURE IS MEASURED DN THE CENTER OF THE BASEPLATE, 3. MATERIALS! CASE! STEEL, GDLD OVER NICKEL PLATED. CDVERj STEEL, NICKEL PLATED, PINS: ALLOY 52, GDLD DVER NICKEL PLATED, PIN SEALS! GLASS Figure 13 - Non-Flanged Package and Pinout

DVHF+2800T SeriesPACKAGE SPECIFICATIONS (FLANGED) Pin Figure 14 - Flanged Package and Pinout

DVHF+2800T 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...

DVHF+2800T SeriesORDERING INFORMATION DVHF+ Notes: 1. Contact the VPT Inc. Sales Department for availability of Class H (/H) and KL1 (/KL1) qualified products. 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. -KL1 products are identical in every way with Class K products in compliance with MIL-PRF-38534 revision L and later revisions except they contain elements evaluated to the requirements of MIL-PRF-38534 revision K and previous revisions. These devices are not...