LM5115A Datasheet | National Semiconductor

LM5115A Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down Tracking .. January 2007 LM5115A Secondary Side Post Regulator/DC-DC Converter with Power-up/Power-down Tracking General 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 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 patible 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 buck regulator. A current sense amplifier provides overload protection and operates over a wide mon 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. 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 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 Typical Application Circuit FIGURE 1. Simplified Multiple Output Power Converter Utilizing SSPR Technique © 2007 National Semiconductor Corporation .national. Co...