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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LTC1435ACS датащи(PDF) 16 Page - Linear Technology |
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LTC1435ACS датащи(HTML) 16 Page - Linear Technology |
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16 / 20 page  16 LTC1435A APPLICATIONS INFORMATION 4. Does the (+) plate of CIN connect to the drain of the topside MOSFET(s) as closely as possible? This capaci- tor provides the AC current to the MOSFET(s). 5. Is the INTVCC decoupling capacitor connected closely betweenINTVCC and the power ground pin? This capaci- tor carries the MOSFET driver peak currents. 6. Keep the switching node SW away from sensitive small- signal nodes. Ideally the switch node should be placed at the furthest point from the LTC1435A. 7. SGND should be exclusively used for grounding exter- nal components on COSC, ITH, VOSENSE and SFB pins. 8. If operating close to the minimum on-time limit, is the sense resistor oriented on the radial axis of the induc- tor? See Figure 8. COSC TG 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 LTC1435A 100pF 1000pF CC1 CC2 RC COSC CSS + 4.7 µF DB D1 CB 0.1 µF CIN M1 M2 L1 R1 R2 RSENSE – + + – VOUT VIN 1435A F10 BOLD LINES INDICATE HIGH CURRENT PATHS COUT RUN/SS ITH SFB SGND VOSENSE SENSE– SENSE+ SW VIN INTVCC BG PGND EXTVCC BOOST ITH TG 1 2 3 5 6 10 11 15 12 14 16 13 78 COSC 43pF CC 1000pF CC2 220pF 50pF RC 10k CSS 0.1 µF SENSE– SENSE+ LTC1435A 1000pF + 4.7 µF CF 0.1 µF DB CMDSH-3 0.22 µF M2 Si4410 D1 MBRS140T3 L1 3.3 µH M1 Si4410 RSENSE 0.015 Ω 4.7 Ω + CIN 10 µF 30V × 2 VIN 4.5V TO 22V + COUT 820 µF 4V × 2 VOUT 1.3V TO 2.0V 7A PGND BG COSC VIN VOSENSE BOOST 1435A TA07 SGND RUN/SS SW INTVCC VID 0 1 2 3 GND FROM µP SENSE LTC1706-19 FB 3 6 4 2 1 8 7 5 VCC Intel Mobile CPU VID Power Converter Figure 10. LTC1435A Layout Diagram TYPICAL APPLICATIONS |
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