50 Watt Power Hold-Up: HUGD-50

High-Reliability DC-DC Converter

High-Reliability DC-DC Converter

1 x 1.5 inch footprint


High-Reliability DC-DC Converter HUGD-50 Datasheet



• Uniquely compact module for power hold-up solutions up to 50W
• Reduce capacitance size by 80%
• High efficiency (98%)
• Compatible with 9-36 or 16-40VDC converters
• Monitoring signals included
• Programmable inrush current limitation


The Gaia Converter Hold up device HUGD-50 provides a state-of-the-art solution to the problem of maintaining electronic system operational during input bus drop-out for 50ms, 200ms or more. The HUGD-50 module provides an alternative solution to reduce the amount of capacitance needed by charging the hold up capacitor at a high voltage (typically 38V) while limiting the input current.

The HUGD-50 is connected between the line source and DC/DC modules. If an EMI filter and /or a pre-regulator are used, the HUGD-50 is connected between them and the converters. Basically the HUGD-50 charges the external capacitor to 38V while powering the DC/DC converters. If the power fails, the HUGD-50 generates a signal and the converters are powered from the external capacitor. The HUGD-50 can be used either with 16-40V or 9-36V input voltage DC/DC converters since the «power fail voltage» is externally adjustable by the user between 8.8V and 15.3V

High-Reliability DC-DC Converter


Gaia's HUGD-50 High-Reliability Hold-Up module is designed for higher operating temperatures of -40 to +105°C (optional -55°C) for typical military & airborne applications:


Available Options (see specs for details):
• T = -55°C Start-Up Temperature
• S = Screening & Serialization
• L = Leaded Process

Modes of Operation

The HUGD-50 features 3 modes of operations:

Charging operation mode: when the input voltage ramps-up and reaches the start-up charge threshold (which is set at 1Vdc above the "power fail voltage"), the HUGD-50 begins to charge the external capacitor at 38 Vdc while powering the dc/dc converter. The charging current is controlled and externally adjustable between 100mA and 2A by a resistor. The capacitor charging time depends on the charging current. When the capacitor voltage reaches 35V,the signal (active low, open-drain) «capacitor charged» is activated and the HUGD-50 enters in the normal operation mode.

Normal operation mode: in normal operation mode when the capacitor is charged and the input bus is between the "output power fail" and 40VDC, the HUGD-50 only consumes little power to keep the capacitor charged (i.e. less than 1W). The voltage drop between input and output is lower than 150mV in the worst case(50W power and 9 VDC input voltage) The HUGD-50 will operate indefinitely in this state until the input voltage drops below the "power fail voltage" threshold.

Power fail mode: when the input voltage drops below the "power fail voltage" threshold, a "power fail" signal is activated and the HUGD-50 disconnects input from output and connects the hold-up capacitor to the output. At this point the DC/DC converters are powered by the capacitor. When its voltage finally discharges to a value slightly above the "power fail voltage" threshold value, a "capacitor discharged" flag is activated.

3D/Step Files

Mechanical Drawings, 3D/Step files:

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