TI-LM5041B.pdf
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LM5041B
www.ti.com
SNVS605 –MAY 2009
LM5041B Cascaded PWM Controller
Check for Samples: LM5041B
1
FEATURES
DESCRIPTION
The LM5041B PWM controller contains all of the
2
• Internal Start-up Bias Regulator
features necessary to implement either current-fed or
• Programmable Line Under-Voltage Lockout
voltage-fed push-pull or bridge power converters.
(UVLO) with Adjustable Hysteresis
These “Cascaded” topologies are well suited for
• Current Mode Control
multiple output and higher power applications. The
LM5041B includes these four control outputs: the
• Internal Error Amplifier with Reference
buck stage controls (HD and LD) and the push-pull
• Cycle-by-cycle Over-Current Protection
control outputs (PUSH and PULL). Push-pull outputs
• Leading Edge Blanking
are driven at 50% nominal duty cycle at one half of
the switching frequency of the buck stage and can be
• Programmable Push-Pull Overlap or Dead
configured for either a specified overlap time (for
Time
current-fed applications) or a specified non-overlap
• Internal 1.5A Push-Pull Gate Drivers
time (for voltage-fed applications). Push-pull stage
• Programmable Soft-Start
MOSFETs can be driven directly from the internal
gate drivers while the buck stage requires an external
• Programmable Oscillator with Sync Capability
driver such as the LM5102. The LM5041B includes a
• Precision Reference
high-voltage start-up regulator that operates over a
• Thermal Shutdown
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
APPLICATIONS
propagation delays of less than 100 ns. Additional
• Telecommunication Power Converters
features include line Under-Voltage Lock-Out
• Industrial Power Converters
(UVLO), Soft-Start, an error amplifier, precision
voltage reference, and thermal shutdown.
• Multi-Output Power Converters
The differences between LM5041, LM5041A and
PACKAGES
LM5041B are as follows: In the LM5041A and the
LM5041B version, the hiccup mode over-current
• TSSOP-16
protection is not employed and the VCC bias
• WSON-16 (5x5 mm) Thermally Enhanced
regulator is not disabled by a low state at the SS pin.
In the LM5041B version, both the high and low side
buck stage gate drivers are forced to a low state
when the controller is disabled. In the LM5041 and
the LM5041B version, the buck stage controller is
disabled by either a low state at the UVLO pin or a
low state at the SS pin. Also in the LM5041B version,
the REF pin 5V regulator is not disabled by a UVLO
pin low state.
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
2All trademarks are the property of their respective owners.
PRODUCTION DATA information is current as of publication date.
Copyright © 2009, Texas Instruments Incorporated
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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