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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP8733 датащи(PDF) 61 Page - Texas Instruments |
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LP8733 датащи(HTML) 61 Page - Texas Instruments |
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61 / 85 page  SW_B0 VIN_B0 VIN_B1 VANA VIN FB_B0 VOUT_B0 LOAD SDA SCL nINT CLKIN (GPO2) GNDs EN GPO SW_B1 FB_B1 PGOOD VOUT_LDO1 VOUT_LDO0 VIN_LDO0 VIN_LDO1 VOUT_LDO0 VOUT_LDO1 Copyright © 2017, Texas Instruments Incorporated COUT_BUCK0 COUT_BUCK1 COUT_LDO1 COUT_LDO0 CIN_LDO1 CIN_LDO0 CIN_BUCK0 CIN_BUCK1 CANA L0 L1 CPOL_BUCK 61 LP8733-Q1 www.ti.com SNVSB64 – SEPTEMBER 2018 Submit Documentation Feedback Copyright © 2018, Texas Instruments Incorporated Typical Applications (continued) (1) Operating temperature range is up to 125°C including self temperature rise. Figure 30. Single Dual-phase Buck Output Configuration 8.2.1 Design Requirements 8.2.1.1 Inductor Selection The inductors L0 and L1 are shown in the Typical Applications. The inductance and DCR of the inductor affects the control loop of the buck regulator. TI recommends using inductors similar to those listed in Table 8. Pay attention to the saturation current and temperature rise current of the inductor. Check that the saturation current is higher than the peak current limit and the temperature rise current is higher than the maximum expected rms output current. Minimum effective inductance to ensure good performance is 0.22 μH at maximum peak output current over the operating temperature range. DC resistance of the inductor must be less than 0.05 Ω for good efficiency at high-current condition. The inductor AC loss also affects conversion efficiency. Higher Q factor at switching frequency usually gives better efficiency at light load to middle load. Shielded inductors are preferred as they radiate less noise. Table 8. Recommended Inductors MANUFACTURER PART NUMBER VALUE DIMENSIONS L × W × H (mm) RATED DC CURRENT ISAT maximum (typical) / ITEMP maximum (typical) (A) DCR typical / maximum (m Ω) TOKO DFE252012PD- R47M 0.47 µH (20%) 2.5 × 2 × 1.2 5.2 (–) / 4 (–)(1) — / 27 Tayo Yuden MDMK2020TR47M MV 0.47 µH (20%) 2 × 2 ×1.2 4.2 (4.8) / 2.3 (2.45) 40 / 46 |
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