ML4863ES MICRO-LINEAR [Micro Linear Corporation], ML4863ES Datasheet
ML4863ES
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ML4863ES Summary of contents
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GENERAL DESCRIPTION The ML4863 is a flyback controller designed for use in multi-cell battery powered systems such as PDAs and notebook computers. The flyback topology is ideal for systems where the battery voltage can be either above or below the ...
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ML4863 PIN CONFIGURATION PIN DESCRIPTION PIN NAME FUNCTION 1 V Battery input voltage IN 2 SENSE Secondary side current sense 3 SHDN Pulling this pin high initiates a shutdown mode to minimize battery drain 4 V Feedback input from transformer ...
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... Lead Temperature (Soldering 10 Sec.) ..................... 260ºC Thermal Resistance ( OPERATING CONDITIONS GND – 0.3V to 18V Temperature Range GND – 0. ML4863CS ................................................. 0ºC to 70ºC ML4863ES ............................................. –20ºC to 70ºC ML4863IS .............................................. –40ºC to 85ºC V Operating Range ................................... 3.15V to 15V IN = Operating Temperature Range (Note 1) A CONDITIONS ...
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ML4863 ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER SUPPLY I V Quiescent Current Shutdown Current Output Voltage CC CC Note 1: Limits are guaranteed by 100% testing, sampling, or correlation with worst case test conditions. ...
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FUNCTIONAL DESCRIPTION The ML4863 utilizes a flyback topology with constant on- time control. The circuit determines the length of the off- time by waiting for the inductor current to drop to a level determined by the feedback voltage (V the ...
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ML4863 FUNCTIONAL DESCRIPTION SYNCHRONOUS RECTIFIER CONTROL The control circuitry for the synchronous rectifier does not influence the operation of the main controller. The synchronous rectifier is turned on during the minimum off time, or whenever the SENSE pin is less ...
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DESIGN CONSIDERATIONS DESIGN PROCEDURE A typical design can be implemented by using the following procedure. 1. Specify the application by defining: The maximum input voltage (V The mainimum input voltage (V The maximum output current (I The maximum output ripple ...
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ML4863 DESIGN CONSIDERATIONS 3c. Specify the inductor’s DC winding resistance 90m DCR 3d. Specify the coupled inductor's turn ratio 1:1 4a. Calculate the minimum output capacitance required using equation ...
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ML4863 33µF 33µF SENSE OUT 2 20V 20V SHDN OUT 1 SHDN V FB Figure 4. 5W Multiple Output DC-DC Converter C4 33µF 20V T1 DALE LPE-6562-A145 7 9 1,5 6, NDS9955 ...
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... ORDERING INFORMATION PART NUMBER ML4863CS ML4863ES ML4863IS (Obsolete) © Micro Linear 1997 registered trademark of Micro Linear Corporation. All other trademarks are the property of their respective owners. Products described herein may be covered by one or more of the following U.S. patents: 4,897,611; 4,964,026; 5,027,116; 5,281,862; 5,283,483; 5,418,502; ...