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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LM3530 датащи(PDF) 36 Page - Texas Instruments |
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LM3530 датащи(HTML) 36 Page - Texas Instruments |
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36 / 50 page  > L ¨ x x x OUT SW V f 2 ¨ © § - SW_MAX I ¸¸ ¹ · x OUT MAX LED V I _ x IN V K ( ) - x IN OUT IN V V V I = L VIN x (VOUT - VIN) 2 x fSW x L x VOUT L IN OUT LED PEAK 'I + V V × K I = I LM3530 SNVS606L – JUNE 2009 – REVISED DECEMBER 2014 www.ti.com 9.2.2.6 Inductor Selection The LM3530 is designed to work with a 10-µH to 22-µH inductor. When selecting the inductor, ensure that the saturation rating for the inductor is high enough to accommodate the peak inductor current. Equation 14 and Equation 15 calculate the peak inductor current based upon LED current, VIN, VOUT, and efficiency. (14) where: (15) When choosing L, the inductance value must also be large enough so that the peak inductor current is kept below the LM3530 switch current limit. This forces a lower limit on L given by Equation 16. (16) ISW_MAX is given in , efficiency (η) is shown in the Application Curves, and ƒSW is typically 500 kHz. Table 15. Suggested Inductors MANUFACTURER PART NUMBER VALUE SIZE (mm) RATING (mA) DC RESISTANCE ( Ω) (µH) TDK VLF3014ST-100MR82 10 2.8 × 3 × 1.4 820 0.25 TDK VLF3010ST-220MR34 22 2.8 × 3 × 1 340 0.81 TDK VLF3010ST-100MR53 10 2.8 × 3 × 1 530 0.41 TDK VLF4010ST-100MR80 10 2.8 × 3 × 1 800 0.25 TDK VLS252010T-100M 10 2.5 × 2 × 1 650 0.71 Coilcraft LPS3008-103ML 10 2.95 × 2.95 × 0.8 520 0.65 Coilcraft LPS3008-223ML 22 2.95 × 2.95 × 0.8 340 1.5 Coilcraft LPS3010-103ML 10 2.95 × 2.95 × 0.9 550 0.54 Coilcraft LPS3010-223ML 22 2.95 × 2.95 × 0.9 360 1.2 Coilcraft XPL2010-103ML 10 1.9 × 2 × 1 610 0.56 Coilcraft EPL2010-103ML 10 2 × 2 × 1 470 0.91 TOKO DE2810C-1117AS-100M 10 3 × 3.2 × 1 600 0.46 9.2.2.7 Diode Selection The diode connected between SW and OUT must be a Schottky diode and have a reverse breakdown voltage high enough to handle the maximum output voltage in the application. Table 16 lists various diodes that can be used with the LM3530. For 25-V OVP devices a 30-V Schottky is adequate. For 40-V OVP devices, a 40-V Schottky diode should be used. Table 16. Suggested Diodes MANUFACTURER PART NUMBER VALUE SIZE (mm) RATING Diodes Inc B0540WS Schottky SOD-323 (1.7 × 1.3) 40 V/500 mA Diodes Inc SDM20U40 Schottky SOD-523 (1.2 × 0.8 × 0.6) 40 V/200 mA On Semiconductor NSR0340V2T1G Schottky SOD-523 (1.2 × 0.8 × 0.6) 40 V/250 mA On Semiconductor NSR0240V2T1G Schottky SOD-523 (1.2 × 0.8 × 0.6) 40 V/250 mA 36 Submit Documentation Feedback Copyright © 2009–2014, Texas Instruments Incorporated Product Folder Links: LM3530 |
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