Features • Self-synchronization to main channel output • Free-run mode for buck regulation of DC input • Leading edge pulse width modulation • Voltage-mode control with current injection and input line feed-forward • 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 or thermally enhanced LLP-16 packages Description The LM25115 controller contains all of the features necessary to implement multiple output power converters utilizing 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. 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 LM25115 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 LM25115A▲ With Power-Up/Power-Down Tracking LM5025▲ Active Clamp Voltage Mode Pwm Controller LM5025A▲ Active Clamp Voltage Mode Pwm Controller LM5115▲ Wider Vin Range (up To 75V) LM5115A▲ Wider Vin Range (up To 75V) 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
	LM25115 Secondary Side Post Regulator Controller	727 Kbytes	30-Nov-05

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Design Tools

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Article - High PoE Made Easy

Reliability Metrics

Part Number	Process	EFR Reject	EFR Sample Size	PPM	LTA Rejects	LTA Device Hours	FITS	MTTF (Hours)
LM25115MT	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25115MTX	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25115SD	ABCD150XV1	0	3868	0	0	2595000	2	736338335
LM25115SDX	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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