Features • Self-synchronization to main channel output • Standalone DC/DC Synchronous buck mode • Leading edge pulse width modulation • Voltage-mode control with current injection and input line feed-forward • Operates from AC or DC input up to 75V • 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 or thermally enhanced LLP-16 packages Description The LM5115 is a versatile switching regulator controller. It has two main application configurations. The first is utilizing the Secondary Side Post Regulation (SSPR) technique to implement multiple output power converters. In the second configuration, it can be used as a standalone synchronous buck controller (Please see page 14 for more details). The SSPR technique develops a highly efficient and well regulated auxiliary output from the secondary side switching waveform of an isolated power converter. 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 LM5115 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▲ 42V Maximum Input LM25115A▲ 42V Maximum Input With Power-Up/Power-Down Tracking LM5025▲ Active Clamp Voltage Mode Pwm Controller LM5025A▲ Active Clamp Voltage Mode Pwm Controller LM5115A▲ With Power-Up/Power-Down Tracking MY BRIEFCASE                                       Click any "Briefcase" icon to add an item

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

Datasheet

Title		Size	Date	Other Language
	LM5115 Secondary Side Post Regulator / Synchronous Buck Controller	756 Kbytes	13-Jul-06

Featured Application Notes

Title		Size	Date	Other Language
	AN-1368: Application Note 1368 LM5115/5025A Evaluation Board	1364 Kbytes	5-Apr-05
	AN-1367: Application Note 1367 LM5115 HV DC Evaluation Board	943 Kbytes	18-Oct-05	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

More Application Notes

Title		Size	Date	Other Language
	AN-1542: Application Note 1542 LM5115A Evaluation Board	1789 Kbytes	17-Mar-07	中文
	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

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM5115MTC	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5115MTCX	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5115SD	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM5115SDX	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.

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