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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM3410XMFE датащи(PDF) 26 Page - Texas Instruments |
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LM3410XMFE датащи(HTML) 26 Page - Texas Instruments |
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26 / 49 page  4 FB VIN AGND 5 6 3 2 1 VIN C1 DIM C2 L1 PGND PGND C3 VO SW L2 D1 R1 LED1 VOUT D = ¨ © § (VIN x K) +VOUT ¸ ¹ · VOUT VIN = 1 - D D x K ¸ ¹ · ¨ © § 1 + + ¸ ¹ · ¨ © § RL1 ¸ ¸ ¹ · ¨ ¨ © § D2 D 2 ' ¨ © §RON ¸ ¹ · ¸ ¸ ¹ · ¨ ¨ © § D D 2 ' 1+ + ¸¸ ¹ · RL2 VD VOUT ¨¨ © § K = ROUT ROUT ROUT ¨ ¨ ¨ ¨ ¨ ¨ © § ¸ ¸ ¸ ¸ ¸ ¸ ¹ · VOUT ROUT = ILED LM3410, LM3410Q SNVS541G – OCTOBER 2007 – REVISED MAY 2013 www.ti.com (66) Therefore: (67) One can see that all variables are known except for the duty cycle (D). A quadratic equation is needed to solve for D. A less accurate method of determining the duty cycle is to assume efficiency, and calculate the duty cycle. (68) (69) Table 7. Efficiencies for Typical SEPIC Applications VIN 2.7V VIN 3.3V VIN 5V VOUT 3.1V VOUT 3.1V VOUT 3.1V IIN 770mA IIN 600mA IIN 375mA ILED 500mA ILED 500mA ILED 500mA η 75% η 80% η 83% SEPIC Converter PCB Layout The layout guidelines described for the LM3410 Boost-Converter are applicable to the SEPIC OLED Converter. Figure 28 is a proper PCB layout for a SEPIC Converter. Figure 28. HB/OLED SEPIC PCB Layout 26 Submit Documentation Feedback Copyright © 2007–2013, Texas Instruments Incorporated Product Folder Links: LM3410 LM3410Q |
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