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AS2333D Datasheet(PDF) 10 Page - List of Unclassifed Manufacturers |
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AS2333D Datasheet(HTML) 10 Page - List of Unclassifed Manufacturers |
10 / 10 page AS23xx Secondary Side Housekeeping Circuit ASTEC Semiconductor 100 3.1 Delaying Remote OFF: DELAY In systems which use the OFF and FAULT pins to provide remote on/off switching, the delay between the OFF pin going high and the FAULT signal going high is programmable with a capaci- tor to ground on the DELAY pin as described in 2.5 above. The POK pin, on the other hand will go high immediately after the OFF pin is open circuited or pulled high, giving the system warn- ing of the impending shutdown. The DELAY pin provides a 1 µA current source to charge the cap, and when the cap charges above 2.5 V, the FAULT pin will go high. 3.2 AC Warning Prior to Primary Drop-out In systems where the input line voltage is switched, the AC pin threshold should be set so that it causes POK to go low before the primary bulk voltage reaches drop-out and the primary PWM shuts off. The output of the AC comparator also causes the UVB pin to pull low, so that the undervoltage sensing does not trip the FAULT latch as the outputs fall below spec. Recall that the AC pin senses a divided down and filtered representation of the secondary side switching waveform, which will provide a proportional rep- resentation of the primary voltage via the turns ratio of the transformer. ASTEC reserves the right to make changes without further notice to any products described herein to improve reliability, function, or design. ASTEC does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights or the rights of others. ASTEC products are not authorized for use as components in life support devices or systems intended for surgical implant into the body or intended to support or sustain life. Buyer agrees to notify ASTEC of any such intended end use whereupon ASTEC will determine availability and suitability of its products for the intended use. ASTEC and the ASTEC logo are trademarks of ASTEC (BSR) PLC. ASTEC SEMICONDUCTOR 255 Sinclair Frontage Road • Milpitas, California 95035 • Tel. (408) 263-8300 • FAX (408) 263-8340 |
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