ECRI Microelectronics

HVSA28 Series Military Grade DC-DC Converters

1. Features (see Fig. 1 for outside view, and Table 1 for models) of HVSA28 Series High Reliability DC/DC Converters

Input DC voltage range: 18~36V, nominal input DC voltage 28V
Output power: 6W
Operating temperature (Tc): -55~+125℃
Input, output and case are isolated mutually
Insulation resistance: R≥100MΩ (DC 500V)
With the function of inhibit and short-circuit protection
Hermetically sealed metal case
Output power: 6W
Input DC voltage range: 18~36V, nominal input DC voltage 28V

Output power: 6W
Operating temperature (Tc): -55~+125℃
Input, output and case are isolated mutually
With the function of inhibit and short-circuit protection
Hermetically sealed metal case
Output power: 6W


2. Scope of application of HVSA28 Series  Military Grade DC-DC Converters

High-reliability electronic system for aviation, aerospace, etc.

Table1 Product models

HVSA28S5

HVSA28S12

HVSA28S28


3. Description of HVSA28 Series  Military Grade DC-DC Converters

HVSA28 series products, the class H DC-DC converter, are designed using the single-end forward PWM principle, after the input DC voltage is converted through pulse, it is coupled by high-frequency transformer for energy transmission, and then is output through rectification and filtration in order to achieve DC voltage conversion. The sampling signal of output voltage is coupled to pulse width modulator through the opto-coupler so as to adjust the pulse width automatically. This close-loop control makes the product have a stable output voltage.
This series product is made by the thick-film hybrid integrated process and is hermetically sealed in a metal case. Both the design and manufacture of the product satisfy the requirements of GJB2438A-2002 “General Specification for Hybrid Integrated Circuits” and specific specification of the products. Connection of input pins into HFG-CE03 power filter can improve EMC performance of the product.

4. Electrical performance (Table 2, Table 3) of HVSA28 Series  Military Grade DC-DC Converters


Table 2  Rated conditions and recommended operating conditions

Absolute max. rated value

Input voltage: 40V

Output power: 6W

Lead soldering temperature: 300℃/(10s)

Storage temperature range: -55~125℃

Inhibit voltage:≤0.2V

Recommended operating conditions

Input DC voltage range: 18~36V

Case temperature (Tc): -55~+125℃

High-reliability hybrid integrated DC/DC converter (HVSA28 series)High-reliability hybrid integrated DC/DC converter (HVSA28 series)High-reliability hybrid integrated DC/DC converter (HVSA28 series)

Application notes:

  • Upon power-on, be sure to correctly connect the positive and negative pole of the power supply to ensure correct power supply for fear of burning.
  • When carrying out the electrical performance test, the test position shall be the pins of the product.
  • Upon assembly, the bottom of the product shall fit to the circuit board closely so as to avoid damage of pins, and shockproof provision shall be added, if necessary.
  • Do not bend the pins to prevent the insulator from breaking, which affects the sealing property.
  • When the user places an order for the product, detailed electric performance indexes shall refer to the relevant enterprise standard.





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