Features 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 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 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 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 . Applications Telecommunication Power Converters Industrial Power Converters Multi-Output Power Converters +42V Automotive Systems

Also Recommended LM3411 Feedback Control / Optocoupler Driver For Isolated Supplies LM5041▲ Base Part, Hiccup Mode Over Current Protection, UVLO Or SS Low Disables Buck Stage Controller LM5041B▲ Gate Drivers Disabled On SS Low Or UVLO LM5102 100V High-Side / Low-Side Dual Mosfet Driver

Typical Application click for larger image	Block Diagram click for larger image
Typical Performance click for larger image

Datasheets

Title		Size	Date	Other Language
	LM5041A Cascaded PWM Controller	721 Kbytes	26-May-05

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM5041AMTC/NOPB LM5041AMTC RoHS Status	TSSOP	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 104 AVNET-EM Worldwide 220 DIGI-KEY Worldwide 102 MOUSER Worldwide 184 RS COMPONENTS Worldwide 6 TAYLOR Americas 104	$2.15 each at 1K+ pcs	rail of 92
LM5041AMTCX/NOPB LM5041AMTCX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.15 each at 1K+ pcs	reel of 2500
LM5041ASD/NOPB LM5041ASD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.15 each at 1K+ pcs	reel of 1000
LM5041ASDX/NOPB LM5041ASDX RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$2.15 each at 1K+ pcs	reel of 4500

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM5041A.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM5041A is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LM5041AMTC/NOPB LM5041AMTC	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM5041A MTC
LM5041AMTCX/NOPB LM5041AMTCX	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSUZXYTT LM5041A MTC
LM5041ASD/NOPB LM5041ASD	64.927 65.192	LLP	16	1 1	260 260	Detail	Download	N/A	NS UZXYTT 5041ASD
LM5041ASDX/NOPB LM5041ASDX	64.927 65.192	LLP	16	1 1	260 260	Detail	Download	N/A	NS UZXYTT 5041ASD

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM5041A.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM5041A is located at RoHS Status.

Design Tools

Title	Size	Date
Application DC/DC Converter Featuring the Cascaded Power Converter Topology

CAD Symbols and Models Download LM5041A CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5041AMTC	ABCD150	0	42680	0	0	6394000	1	1814314958
LM5041AMTCX	ABCD150	0	42680	0	0	6394000	1	1814314958
LM5041ASD	ABCD150	0	42680	0	0	6394000	1	1814314958
LM5041ASDX	ABCD150	0	42680	0	0	6394000	1	1814314958

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LM5041A.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LM5041A is located at RoHS Status.