LM5041_14 Datasheet, PDF (1/21 Pages) Texas Instruments – Cascaded PWM Controller

LM5041
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SNVS248C – MAY 2004 – REVISED MAY 2004
LM5041 Cascaded PWM Controller
Check for Samples: LM5041
FEATURES
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•2 Internal Start-up Bias Regulator
• Programmable Line Under-Voltage Lockout
(UVLO) with Adjustable Hysteresis
• Current Mode Control
• Internal Error Amplifier with Reference
• Dual Mode Over-Current Protection
• Leading Edge Blanking
• Programmable Push-Pull Overlap or Dead
Time
• Internal 1.5A Push-Pull Gate Drivers
• Programmable Soft-start
• Programmable Oscillator with Sync Capability
• Precision Reference
• Thermal Shutdown
APPLICATIONS
• Telecommunication Power Converters
• Industrial Power Converters
• Multi-Output Power Converters
• +42V Automotive Systems
DESCRIPTION
The LM5041 PWM controller contains all of the features necessary to implement either current-fed or voltage-fed
push-pull or bridge power converters. These “Cascaded” topologies are well suited for multiple output and higher
power applications. The LM5041’s four control outputs include: the buck stage controls (HD and LD) and the
push-pull control outputs (PUSH and PULL). Push-pull outputs are driven at 50% nominal duty cycle at one half
of the switching frequency of the buck stage and can be configured for either a guaranteed overlap time (for
current-fed applications) or a guaranteed both-off time (for voltage-fed applications). Push-pull stage MOSFETs
can be driven directly from the internal gate drivers while the buck stage requires an external driver such as the
LM5102. The LM5041 includes a high-voltage start-up regulator that operates over a wide input range of 15V to
100V. The PWM controller is designed for high-speed capability including an oscillator frequency range up to 1
MHz and total propagation delays of less than 100ns. Additional features include: line Under-Voltage Lockout
(UVLO), soft-start, an error amplifier, precision voltage reference, and thermal shutdown.
Packages
• TSSOP-16
• LLP-16 (5x5 mm) Thermally Enhanced
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2004, Texas Instruments Incorporated