LM5041 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Cascaded PWM Controller

LM5041
www.ti.com
SNVS248D – AUGUST 2003 – REVISED MARCH 2013
LM5041 Cascaded PWM Controller
Check for Samples: LM5041
FEATURES
1
•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
PACKAGES
• TSSOP-16
• WSON-16 (5x5 mm) Thermally Enhanced
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 specified overlap time (for
current-fed applications) or a specified 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.
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.
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