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LT3650IMSE-4.2PBF 数据表(PDF) 13 Page - Linear Technology |
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LT3650IMSE-4.2PBF 数据表(HTML) 13 Page - Linear Technology |
13 / 20 page LT3650-4.1/LT3650-4.2 13 36504142fb Rectifier Selection The rectifier diode in an LT3650 battery charger provides a current path for the inductor current when the main power switch is disabled. The rectifier is selected based upon forward voltage, reverse voltage, and maximum current. A Schottky diode is required, as low forward voltage yields the lowest power loss and highest efficiency. The rectifier diode must be rated to withstand reverse voltages greater than the maximum VIN voltage. The minimum average diode current rating (IDIODE(MAX)) is calculated with maximum output current (IMAX),maximum operational VIN, and output at the precondition threshold (VBAT(PRE)): I IV V V DIODE MAX MAX IN MAX BAT PRE IN MA () () ( ) ( • > − () X X A ) () For example, a rectifier diode for a 4.2V, 1.5A charger with a 20V maximum input voltage would require: Ior I DIODE MAX DIODE MAX () () .• ( . ) ,: > − > 15 20 29 20 1..3A CLP: System Current Limit The LT3650 contains a PowerPathTM control feature to support multiple load systems. The charger adjusts output current in response to a system load if overall input supply current exceeds the programmed maximum value. Maximum input supply current is set by choosing a sense resistor (RCLP) such that the desired maximum current through that sense resistor creates a 50mV drop, or: R I CLP MAX IN = 005 . () where IMAX(IN)isthemaximuminputcurrent.A1.5Asystem limit, for example, would use a 33m Ω sense resistor. The LT3650 integrates the CLP signal internally, so average current limiting is performed in most cases without the need for external filter elements. APPLICATIONS INFORMATION Figure 4. RCLP Sets the Input Supply Current Limit 365042 F04 CLP SYSTEM LOAD INPUT SUPPLY VIN RCLP LT3650 365042 F05 0.5A 1.0A 1.5A LT3650 INPUT CURRENT (IVIN) SYSTEM LOAD CURRENT Figure 5. CLP Limit: Charger Current vs System Load Current with 1.5A Limit PowerPath is a trademark of Linear Technology Corporation. |
类似零件编号 - LT3650IMSE-4.2PBF |
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类似说明 - LT3650IMSE-4.2PBF |
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