Input:

Output:

Current:

Package:

18-36 V

50 V

Half-brick

Technical Specification

APPLICATION CONSIDERATIONS

Input System Instability: This condition can occur because

any DC-DC converter appears incrementally as a negative

resistance load. A detailed application note titled “Input System

Instability” is available on the SynQor website which provides

an understanding of why this instability arises, and shows the

preferred solution for correcting it.

Application Circuits: Figure C below provides a typical circuit

diagram which details the input filtering and voltage trimming.

Input Filtering and External Input Capacitance: Figure D

below shows the internal input filter components. This filter dra-

matically reduces input terminal ripple current, which otherwise

could exceed the rating of an external electrolytic input capacitor.

The recommended external input capacitance is specified in the

Input Characteristics section on the Electrical Specifications page.

More detailed information is available in the application note

titled “EMI Characteristics” on the SynQor website.

Output Filtering and External Output Capacitance:

Figure D below shows the internal output filter components. This

filter dramatically reduces output voltage ripple. However, some

minimum external output capacitance is required, as specified in

the Output Characteristics section on the Electrical Specifications

page. No damage will occur without this capacitor connected,

but peak output voltage ripple will be much higher.

External

Input

Filter

Trim

or

ON/OFF

Regulation

Stage

Isolation

Stage

Current

Sense

Electrolytic

Capacitor

Figure C: Typical application circuit (negative logic unit, permanently enabled).

Product # IQ24500HZx10

Phone 1-888-567-9596

www.synqor.com

Doc.# 005-HZC2450 Rev. D

06/16/09

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