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LT3650IMSE-4.1 数据表(PDF) 12 Page - Linear Technology |
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LT3650IMSE-4.1 数据表(HTML) 12 Page - Linear Technology |
12 / 20 page LT3650-4.1/LT3650-4.2 12 36504142fb RSENSE: Charge Current Programming The LT3650 charger is configurable to charge at average currents as high as 2A. Maximum charge current is set by choosing an inductor sense resistor such that the desired maximum average current through that sense resistor creates a 100mV drop, or: R I SENSE MAX AVG = 01 . () where IMAX(AVG) is the maximum average charge current. A 2A charger, for example, would use a 0.05 Ω sense resistor. to 35% of IMAX, so an inductor value can be determined by setting 0.25 < ΔIMAX < 0.35. Magnetics vendors typically specify inductors with maximum RMS and saturation current ratings. Select an inductor that has a saturation current rating at or above (1+ ΔIMAX/2) • IMAX, and an RMS rating above IMAX. Inductors must also meet a maximum volt-second product require- ment. If this specification is not in the data sheet of an inductor, consult the vendor to make sure the maximum volt-second product is not being exceeded by your design. The minimum required volt-second product is: V V V Vs BAT BAT IN MAX •• () 1 − ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ () μ APPLICATIONS INFORMATION Figure 1. Programming Maximum Charge Current Using RSENSE 365042 F01 SW BOOST SENSE BAT RSENSE LT3650 MAXIMUM OPERATIONAL VIN VOLTAGE (V) 0 6 8 10 18 30 365042 F02 4 2 0 612 24 MAXIMUM OPERATIONAL VIN VOLTAGE (V) 0 16 18 30 365042 F03 12 8 4 612 24 Figure 2. 2A Charger Switched Inductor Value (RSENSE = 0.05 Ω) 25% to 35% IMAX Ripple Current Figure 3. 1.3A Charger Switched Inductor Value (RSENSE = 0.075 Ω) 25% to 35% IMAX Ripple Current Inductor Selection The primary criteria for inductor value selection in an LT3650 charger is the ripple current created in that inductor. Once the inductance value is determined, an inductor must also have a saturation current equal to or exceeding the maximum peak current in the inductor. An inductor value (L), given the desired amount of ripple current ( ΔIMAX) can be approximated using the relation: L I RV V VV V MAX SENSE BAT F BAT F = ⎛ ⎝⎜ ⎞ ⎠⎟ + () − + 10 1 Δ •• • IIN MAX F V H () + ⎡ ⎣ ⎢ ⎢ ⎤ ⎦ ⎥ ⎥ ⎛ ⎝ ⎜ ⎞ ⎠ ⎟ () μ In the previous relation, ΔIMAX is the normalized ripple current, VIN(MAX) as the maximum operational voltage, and VF is the forward voltage of the rectifying Schottky diode. Ripple current is typically set within a range of 25% |
类似零件编号 - LT3650IMSE-4.1 |
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类似说明 - LT3650IMSE-4.1 |
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