Features Power-up/Power-down Tracking Self-synchronization to main channel output Leading edge pulse width modulation Valley current Mode control Standalone DC/DC synchronous buck mode Operates from AC or DC input up to 42V Wide 4.5V to 30V bias supply range Wide 0.75V to 13.5V output range. Top and bottom gate drivers sink 2.5A peak Adaptive gate driver dead-time control Wide bandwidth error amplifier (4MHz) Programmable soft-start Thermal shutdown protection TSSOP-16 package Description The LM25115A controller contains all of the features necessary to produce multiple tracking outputs using the Secondary Side Post Regulation (SSPR) technique. The SSPR technique develops a highly efficient and well regulated auxiliary output from the secondary side switching waveform of an isolated power converter. LM25115A can be also used as a standalone DC/DC synchronous buck controller ( Refer to Synchronous Buck section). Regulation of the auxiliary output voltage is achieved by leading edge pulse width modulation (PWM) of the main channel duty cycle. Leading edge modulation is compatible with either current mode or voltage mode control of the main output. The LM25115A drives external high-side and low-side NMOS power switches configured as a synchronous buck regulator. A current sense amplifier provides overload protection and operates over a wide common mode input range. Additional features include a low dropout (LDO) bias regulator, error amplifier, precision reference, adaptive dead time control of the gate signals and thermal shutdown.

Also Recommended LM25115▲ No Tracking LM5025▲ Active Clamp Voltage Mode Pwm Controller LM5025A▲ Active Clamp Voltage Mode Pwm Controller LM5115▲ Wider Vin Range (up To 75V) With No Tracking LM5115A▲ Wider Vin Range (up To 75V)

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

Datasheets

Title		Size	Date	Other Language
	LM25115A Secondary Side Post Regulator/DC-DC Converter with Power-Up/Power-Down Tracking	406 Kbytes	18-Mar-07

Application Notes

Title		Size	Date	Other Language
	AN-1367: Application Note 1367 LM5115 HV DC Evaluation Board	943 Kbytes	18-Oct-05	中文
	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-1875: Application Note 1875 LM5073HE Evaluation Board With Active Bridge	230 Kbytes	2-Jul-08
	AN-1574: Application Note 1574 LM5073 Evaluation Board	464 Kbytes	24-Apr-07
	AN-1628: Application Note 1628 Minimizing FET Losses For a High Input Rail Buck Converter	91 Kbytes	5-Sep-07	日本語 中文

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LM25115AMT/NOPB LM25115AMT RoHS Status	TSSOP	Full production Lead Time: 8 weeks	Distributor Region Qty ARROW Worldwide 236 DIGI-KEY Worldwide 554 MOUSER Worldwide 276 RS COMPONENTS Worldwide 9 TAYLOR Americas 236	$1.40 each at 1K+ pcs	rail of 92
LM25115AMTX/NOPB LM25115AMTX RoHS Status	TSSOP	Full production Lead Time: 8 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.40 each at 1K+ pcs	reel of 2500

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 LM25115A.

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 LM25115A 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
LM25115AMT/NOPB LM25115AMT	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSUZXYTT L25115 AMT
LM25115AMTX/NOPB LM25115AMTX	56.74 57	TSSOP	16	1 1	260 260	Detail	Download	N/A	NSUZXYTT L25115 AMT

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 LM25115A.

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 LM25115A is located at RoHS Status.

Design Tools

Title	Size	Date
Article - Hitchhiker's Ride to the World of Current Mode Control

CAD Symbols and Models Download LM25115A CAD Symbols

Models N/A

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25115AMT	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25115AMTX	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 LM25115A.

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 LM25115A is located at RoHS Status.