Features Internal Start-up Bias Regulator 3A Compound Main Gate Driver Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis Voltage Mode Control with Feed-Forward Adjustable Dual Mode Over-Current Protection Programmable Overlap or Deadtime between the Main and Active Clamp Outputs Volt x Second Clamp Programmable Soft-start Leading Edge Blanking Single Resistor Programmable Oscillator Oscillator UP / DOWN Sync Capability Precision 5V Reference Thermal Shutdown Description The LM5025 PWM controller contains all of the features necessary to implement power converters utilizing the Active Clamp / Reset technique. The device can be configured to control either a P-Channel clamp switch or an N-Channel clamp switch. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp / reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The active clamp output can be configured for either a guaranteed overlap time (for P-Channel switch applications) or a guaranteed deadtime (for N_Channel applications). The two internal compound gate drivers parallel both MOS and Bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1MHz and total PWM and current sense propagation delays less than 100ns. The LM5025 includes a high-voltage start-up regulator that operates over a wide input range of 13V to 90V. Additional features include: Line Under Voltage Lockout (UVLO), softstart, oscillator UP/DOWN sync capability, precision reference and thermal shutdown.

Also Recommended LM3411 Feedback Control / Optocoupler Driver For Isolated Supplies LM5025A▲ Active Clamp Voltage Mode PWM Controller LM5026▲ Current Mode Control Version LM5034▲ Dual Interleaved Active Clamp Current Mode Controller LM5110 Dual 5A Compound Gate Driver With Negative Drive Capability LM5112 High Current 7A Single Low-Side Mosfet Driver

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

Datasheets

Title		Size	Date	Other Language
	LM5025 Active Clamp Voltage Mode PWM Controller	316 Kbytes	23-Mar-04

Application Notes

Title		Size	Date	Other Language
	AN-1345: Application Note 1345 LM5025A Evaluation Board	671 Kbytes	17-Dec-04
	AN-1368: Application Note 1368 LM5115/5025A Evaluation Board	1364 Kbytes	5-Apr-05
	AN-1542: Application Note 1542 LM5115A Evaluation Board	1789 Kbytes	17-Mar-07	中文
	AN-1574: Application Note 1574 LM5073 Evaluation Board	464 Kbytes	24-Apr-07

Other Technical Documents

Title		Type	Date
	Increase Boost Regulator Efficiency With Synchronous Rectification	External Article	2010-01-15
	Operation and Benefits of Active-Clamp Forward Power Converters	Power Designer	2007-03-22
	Get Your Isolated Power Converter Off to a Smooth Start	External Article	2010-01-29
	PWM DC-DC Controllers with Built-In Start-Up Regulators Simplify Switching Power Supply Design	Technology Edge	2005-10-01
	Feedback Techniques for Crossing the Isolation Boundary	Power Designer	2007-03-22
	High PoE Made Easy	External Article	2007-09-03

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM5025MTC/NOPB LM5025MTC RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty ARROW Worldwide 552 AVNET-EM Worldwide 342 DIGI-KEY Worldwide 258 MOUSER Worldwide 176 RS COMPONENTS Worldwide 40 TAYLOR Americas 552	$1.25 each at 1K+ pcs	rail of 92
LM5025MTCX/NOPB LM5025MTCX RoHS Status	TSSOP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0 MOUSER Worldwide 2500 RSL MICRO Asia Pacific 15000	$1.25 each at 1K+ pcs	reel of 2500
LM5025SD/NOPB LM5025SD RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 1625	$1.25 each at 1K+ pcs	reel of 1000
LM5025SDX/NOPB RoHS Status	LLP	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.25 each at 1K+ pcs	reel of 4500
LM5025 MDC RoHS Status		Full production Lead Time: N/A	Contact your distributor	CALL	tray of N/A

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 LM5025.

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 LM5025 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
LM5025MTC/NOPB LM5025MTC	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	spice file	NSZXYTT LM5025 MTC
LM5025MTCX/NOPB LM5025MTCX	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	spice file	NSZXYTT LM5025 MTC
LM5025SD/NOPB LM5025SD	64.927 65.192	LLP	16	1 1	260 260	Detail	Download	spice file	NS UZXYTT 5025SD
LM5025SDX/NOPB	64.927	LLP	16	1	260	Detail	Download	spice file	NS UZXYTT 5025SD
LM5025 MDC	N/A	Unpackaged Die				spice file	-

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 LM5025.

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 LM5025 is located at RoHS Status.

Design Tools

Title	Size	Date
Article - High PoE Made Easy

Reference Design

RD-137 - LM5025 Reference Design - Active clamp forward converter with an input of 30-60V to 15V@1.5A isolated

CAD Symbols and Models Download LM5025 CAD Symbols

Models spice file

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5025 MDC	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025MTC	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025MTCX	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025SD	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5025SDX	ABCD150XV1	0	3868	0	0	2595000	2	736338335

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 LM5025.

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 LM5025 is located at RoHS Status.