Evaluation Board For The Ad9834 Direct Digital Synthesizer

Posted on Feb 6, 2014

This paper describes the design of a low ’cost 90 W flyback switching power supply for a multi ’sync color monitor. In order to minimize the screen interference from the switching noise, the power supply CAN be automatically synchronized at the fixed frequency of the horizontal scanning frequency (15 to 32 kHz) of the color monitor. The line and

Evaluation Board For The Ad9834 Direct Digital Synthesizer
Click here to download the full size of the above Circuit.

load regulations of the power supply are excellent. Also, a new universal input ’voltage adaptor enables the power supply to operate at two input voltage ranges, 90 ’130 Vac or 180 ’260 Vac. It CAN minimize the ripple current requirement of the input bulk capacitors and the stresses on the power Switch The design demonstrates how to use recently introduced components in a low ’cost power supply. The state ’of ’the ’art perforated emitter epi ’collector bipolar Power Transistor MJE18004 and opto ’isolator MOC8102 are utilized. MC3423P UC3842A (for MTP4N90) UC3843A (for MJE18004 MC3423P TL431CLP MOC8102 MTP4N90 MCR102 MAC229A8 MJE18004 2N3906 1N4001 1N5819 1N5398 MUR140 MUR180 MBR160 1N4735A 6. 2 V 1N4740A 10 V (for MJE18004 1N4747A 20 V (for MTP4N90) 1N5953A 150 V (optional) 1N5956A 200 V

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