Part # LM5041 datasheet

Part Manufacturer: National Semiconductor

National Semiconductor

Part Description: LM5041 Cascaded PWM Controller

Part Details:

LM5041 April 2004 Cascaded LM5041Cascaded PWM ControllerGeneral Description Features The LM5041 PWM controller contains all of the features n Internal Start-up Bias Regulator PWM necessary to implement either current-fed or voltage-fed n Programmable Line Under-Voltage Lockout (UVLO) with push-pull or bridge power converters. These "Cascaded" Adjustable Hysteresis topologies are well suited for multiple output and higher n Current Mode Control power applications. The LM5041 s four control outputs in- n Internal Error Amplifier with Reference Controller clude: the buck stage controls (HD and LD) and the push- n Dual Mode Over-Current Protection pull control outputs (PUSH and PULL). Push-pull outputs are n Leading Edge Blanking driven at 50% nominal duty cycle at one half of the switchingfrequency of the buck stage and can be configured for either n Programmable Push-Pull Overlap or Dead Time a guaranteed overlap time (for current-fed applications) or a n Internal 1.5A Push-Pull Gate Drivers guaranteed both-off time (for voltage-fed applications). n Programmable Soft-start Push-pull stage MOSFETs can be driven directly from the n Programmable Oscillator with Sync Capability internal gate drivers while the buck stage requires an exter- n Precision Reference nal driver such as the LM5102. The LM5041 includes a n Thermal Shutdown high-voltage start-up regulator that operates over a wideinput range of 15V to 100V. The PWM controller is designed Applications for high-speed capability including an oscillator frequencyrange up to 1 MHz and total propagation delays of less than n Telecommunication Power Converters 100ns. Additional features include: line Under-Voltage Lock- n Industrial Power Converters out (UVLO), soft-start, an error amplifier, precision voltage n Multi-Output Power Converters reference, and thermal shutdown. n +42V Automotive Systems Packagesn TSSOP-16 n LLP-16 (5x5 mm) Thermally Enhanced Typical Application Circuit 20074901 Simplified Cascaded Push-Pull Power Converter © 2004 National Semiconductor Corporation DS200749 Connection Diagram LM5041 20074902

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LM5041.pdf Datasheet