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LM5115A

Texas Instruments

Secondary Side Post Regulator/DC-DC Converter

LM5115A www.ti.com SNVS467B – DECEMBER 2006 – REVISED MARCH 2013 LM5115A Secondary Side Post Regulator/DC-DC Converte...


Texas Instruments

LM5115A

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Description
LM5115A www.ti.com SNVS467B – DECEMBER 2006 – REVISED MARCH 2013 LM5115A Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down Tracking Check for Samples: LM5115A FEATURES 1 2 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 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 Package DESCRIPTION The LM5115A 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. LM5115A can be also used as a standalone DC/DC synchronous buck controller (Refer to Standalone DC/DC Synchronous Buck Mode 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 LM5115A drives external high-side and low-side NMOS power switches configured as a synchronous bu...




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