Hi-Rel Grade, DC/DC Hold-Up, 50 W

General Characteristics

  • Additional functions : monitoring signals, programmable charging current limitation, programmable power fail threshold
  • Charger switching frequency : 200
  • Galvanic isolation input/output : non isolated
  • Power range : from 4 W to 50 W
  • Protections : reverse polarity
  • Leaded on option

Key Features

  • Compatible with 9-36 or 16-40 Vdc converters
  • Dedicated to DO-160, MIL-704
  • Reduce capacitance value by 80%
  • Unique product for hold-up solutions

Series Description
The GAIA Converter Hold up device HUGD-50 provides a state-of-the-art solution to the problem of maintaining electronic system in operation during input bus drop-out for enough time. Usually this approach uses very large capacitors because they are only charged at the voltage at which power fails. The GAIA Converter 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 must be 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 16-40 V or 9-36 V input voltage DC/DC converters since the "power fail voltage" is externally adjustable by the user between 8.8 V and 15.3 V. 
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 1 Vdc 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 100 mA and 2 A by a resistor. The capacitor charging time depends on the charging current. When the capacitor voltage reaches 35 V, 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 40 Vdc, the HUGD-50 only consumes power to keep the capacitor charged (i.e.less than 1 W). The voltage drop between input and output is lower than 150 mV 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.
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Product Selection

This product selection table includes all available versions. Other references may be offered – see technical datasheets.
For more information, please consult factory.

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Reference Status Output power Input voltage Max. transient input voltage Output current Case dimensions Standard electrical functions Adj. hold-up capa final voltage Hold up mode threshold voltage Operating case temp. range Case material Charger switching frequency DC resistance UVLO min Voltage drop @ I max Weight Options RoHS / SnPb
HUGD-50 Active 50 W 5.6 A 40.2 x 26.2 x 8.2 mm CC, CD, PF, REV.POL 38 Vdc non adj 9.5 to 15.3 Vdc -40 to 105 °C Metallic black anodized coating 200 KHz 20 Grams S

Output Nbr: S: Single output, B: Bi-outputs, D: Dual outputs, T: Triple outputs – Dual outputs products can be usable for single output or bi-outputs. Output Nbr E corresponds to a slave module (see DataSheet)
Case dimensions: L x W x H (maximum values in mm)
Standard electrical functions: Case: Case connection, OVLO: Input overvoltage lockout, UVLO: Input under voltage lockout, OCP: Output over current protection level, OPP: Output over power protection, OVP: Output over voltage protection level, SCP: Output short circuit protection, OTP: Over temperature protection, VIF: Pin for Input Current Ripple Reduction, SYNC: Pin for Synchronisation, TRIM: Pin for adjust ouput voltage, ITRIM: Pin for adjustement ouput current limitation, CC: Pin for capacitor charged signal, CD: Pin for capacitor discharged signal, UVLOadj: Pin for level undervoltage lockout adjust, VREF: Pin for output internal voltage reference, PF: Pin for power fail signal, SENSE: Pin for voltage regulation, REV.POL: Reverse polarity protection, SHARE: Pin for output current parallel sharing
Status NPR: Not preferred for new Design
Options: T Screening at start-up -55° C, Y High isolation 3000 Vdc, M On/Off function, S Screening and serialization, F Synchronization function, P Share function

Technical Documentation
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Materials Disclosure Disclaimer
Even though all possible efforts have been made to provide you with the most accurate information, we can not guarantee to its completeness and accuracy due to the fact that the data has been compiled based on the ranges provided and some information that may not have been provided by the subcontractors and raw material suppliers to protect their business proprietary information.