SC4524 Semtech Corporation, SC4524 Datasheet
SC4524
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SC4524 Summary of contents
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... The SC4524 can be programmed up to 1.5MHz. This allows the use of small inductor and ceramic capacitors, resulting in very compact power supplies. The SC4524 is suitable for next generation XDSL modems, set-top boxes and point of load applications. The SC4524 uses peak current-mode PWM control for www ...
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... SC4524 ° C ° ° ° C ° C ° ...
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... SC4524 µ A µ µ ...
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... SC4524 ...
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... Figure 3. Details of the Soft-Start and Overload Hiccup Control Circuit 2006 Semtech Corp SLOPE COMP + S PWM - R 1V 0.7V REFERENCE FAULT & THERMA L SHUTDOW N SLO PE COMP SLOPE COMP CLK OSCILLATOR Figure 2. SC4524 Functional Diagram + + - - 0.7V 0.7V 1.8mA 1.8mA 1V/2 V 1V/2 V 2.6mA 2.6mA 5 SC4524 VIN 2 + ISEN - 6.3mW + 20m V ...
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... Ur €ƒr …h‡ˆ…r Ã8 Ur € ƒr … h ‡ˆ…r à € ƒr … h ‡ˆ…r à € à ‡ r … … ˆ 8 à à ‡ † ‚ ‚ TT à TT SC4524 66 ...
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... & ã SC4524 # " Ã2Ã!$ƒ " A7ÃP‰ r …y‚hqÃUu…r†u‚yqà ‰ †ÃU r €ƒr …h‡ˆ…r Ur € ...
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... W ã SC4524 ...
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... D 287 = 287 = 287 = W ¼ ¼ ¼ D 287 = 287 ã à à à ÔÏ ÔÏ † à Ur €ƒr …h ‡ˆ…r Ã8 SC4524 ...
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... .+] . .+] &(6 SC4524 - - - = D 287 / ...
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... ¼ www.DataSheet4U.com = - ¼ 287 W ã ¼ ¼ , 287 = Ë Û Ì Ì Ü Ü 287 / Í Ý 287 ¼ 287 = + = m m SC4524 m D ...
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... D BST + 6: & %67 = & %67 SC4524 & % 5(&7 b Ur €ƒr …h ‡ˆ…rÃ8 b %67 ' 5(&7 ...
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... Since V OUT >2.5V) to maximize efficiency. In general efficiency T ON penalty increases as D decreases. . The energy loss b Figure 7 summarizes various ways of bootstrapping the OUT ON for a power SC4524. A fast switching PN diode (such as 1N4148 or b DBST CBST VIN VOUT D RECT = - > 2.5V CBST VIN ...
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... Figure 7(c) reduces the maximum BST pin voltage. The BST pin voltage should not exceed its absolute maximum rating of 42V. Figures 7(d) and (e) show how to bootstrap the SC4524 from a second power supply V Since the inductor current charges C circuit requires some minimum load current to get going. ...
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... Figure 9(b). 2006 Semtech Corp. Overload / Short-Circuit Protection The current limit comparator in the SC4524 limits the peak inductor current to 3.2A (typical). The regulator output voltage will fall if the load is increased above the current limit. If overload is detected (the output voltage falls below 70% of the set voltage), then the regulator will be shut off. An internal 0.8µ ...
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... W 287 w 287 287 Î Þ Ë Û Ì Ì Ü Ü Ï ß ÔÏ Í Ý Ð à 287 ( ) + ¼ + >> >> & SC4524 & ...
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... Figure 10. Simplified Control Loop Equivalent Circuit OUT OUT Control-to-Output Transfer Function . OUT V OUT ESR R OUT C11 COMP v OUT SC4524 www.semtech.com ...
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... I5 >> 5 ÔÏ SC4524 287 ...
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... N Û ™ Ì Ü Ì Ü ¼ Í Ý ¼ ¼ p ™ ¼ p ™ ¼ www.DataSheet4U.com ã ¼ ™ ¼ ¼ ™ ™ SC4524 ...
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... G‚h qà 8ˆ… …r ‡Ã6 G‚h qà 8ˆ… …r ‡Ã6 SC4524 (IILFLHQF È Ã ’ ...
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... 0° 8° 0° 8° aaa .004 0.10 bbb .010 0.25 ccc .008 0. GAGE PLANE 0. (L1) A DETAIL A -H- DIMENSIONS DIM INCHES MILLIMETERS (.205) (5.20 .134 3.40 E .201 5.10 F .101 2.56 G .118 3.00 P .050 1.27 X .024 0.60 Y .087 2.20 Z .291 7.40 SC4524 www.semtech.com ...