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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LT3751EUFD датащи(PDF) 17 Page - Linear Technology |
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LT3751EUFD датащи(HTML) 17 Page - Linear Technology |
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17 / 28 page  LT3751 17 3751f Figure 9. Maximum Switching Frequency PEAK PRIMARY CURRENT (A) 3751 F09 10.000 0.010 0.100 1.000 0.001 1 10 100 fMAX = 50kHz fMAX = 100kHz fMAX = 200kHz APPLICATIONS INFORMATION Table 1. Recommended Transformers MANUFACTURER PART NUMBER SIZE L × W × H (mm) MAXIMUM IPRI (A) LPRI (μH) TURNS RATIO (PRI:SEC) Coilcraft www.coilcraft.com DA2033-AL DA2034-AL GA3459-BL GA3460-BL 17.4 × 24.1 × 10.2 20.6 × 30 × 11.3 32.65 × 26.75 × 14 32.65 × 26.75 × 14 5 10 20 50 10 10 5 2.5 1:10 1:10 1:10 1:10 Midcom www.midcom.com 750032051 750032052 750310349 750310355 28.7 × 22 × 11.4 28.7 × 22 × 11.4 36.5 × 42 × 23 36.5 × 42 × 23 5 10 20 50 10 10 5 2.5 1:10 1:10 1:10 1:10 Sumida www.sumida.com C8117 C8119 PS07-299 PS07-300 23 × 18.6 × 10.8 32.2 × 27 × 14 32.5 × 26.5 × 13.5 32.5 × 26.5 × 13.5 5 10 20 50 10 10 5 2.5 1:10 1:10 1:10 1:10 TDK www.tdk.com DCT15EFD-U44S003 DCT20EFD-U32S003 DCT25EFD-U27S005 22.5 × 16.5 × 8.5 30 × 22 × 12 27.5 × 33 × 15.5 5 10 20 10 10 5 1:10 1:10 1:10 Figure 9 defines the maximum boundary-mode switching frequency when operating at a desired output power level and is normalized to LPRI/POUT (μH/Watt). The relation- ship of output power, boundary-mode frequency, IPK, and primary inductance can be used as a guide throughout the design process. RVTRANS & RDCM Selection RVTRANS sets the common-mode reference voltage for both the DCM comparator and VOUT comparator. Select RVTRANS from the design guide in Figure 10. The RVTRANS pin is connected to an internal 40μA current source. Pin current increases as the pin voltage is taken higher than the internal 60V zener clamp. Choose 25k for VTRANS voltage below 12V. Choose 40k for VTRANS voltage between 12V and 60V. For VTRANS voltage greater than 60V, choose RVTRANS to limit RVTRANS pin voltage to less than 60V (i.e. 55V). RVTRANS = VTRANS –55V 40 μA RDCM needs to be properly designed in relation to RVTRANS. Improper selection of RDCM can lead to undesired switch- ing operation at low output voltages. RDCM = 0.45 •RVTRANS Figure 10. Suggested RVTRANS Resistance 3751 F10 150k 125k 50k 75k 100k 25k 10 20 30 40 VTRANS (V) 50 60 80 70 SUGGESTED RVTRANS RESISTANCE |
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