LM5115 Datasheet | Texas Instruments

.ti. SNVS343E - MARCH 2005 - REVISED MARCH 2013 LM5115 Secondary Side Post Regulator / Synchronous Buck Controller Check for Samples: LM5115 Features - 2 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 WSON-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 Standalone DC/DC Synchronous Buck Mode 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 patible 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 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. Typical Application Circuit INPUT FEEDBACK Main Converter PWM Controller Phase Signal Main...