LM5041AMTCX Datasheet, PDF (1/22 Pages) Texas Instruments – LM5041A Cascaded PWM Controller

LM5041A
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SNVS350B – MARCH 2005 – REVISED MARCH 2013
LM5041A Cascaded PWM Controller
Check for Samples: LM5041A
FEATURES
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• Internal Start-up Bias Regulator
• Programmable Line Under-Voltage Lockout
(UVLO) with Adjustable Hysteresis
• Current Mode Control
• Internal Error Amplifier with Reference
• Cycle-by-cycle 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 LM5041A 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
LM5041A’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 an overlap time (for current-fed
applications) or a 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 LM5041A 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.
The two differences between the LM5041 and the
LM5041A are: No second level current limit in the 'A'
version No softstart (SS) shutdown comparator in the
'A' version.
PACKAGES
• TSSOP-16
• WSON-16 (5 mm × 5 mm) Thermally Enhanced
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