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LM25115

Texas Instruments
Part Number LM25115
Manufacturer Texas Instruments
Description Secondary Side Post Regulator Controller
Published Nov 7, 2021
Detailed Description LM25115 www.ti.com SNVS418A – NOVEMBER 2005 – REVISED APRIL 2013 LM25115 Secondary Side Post Regulator Controller Che...
Datasheet PDF File LM25115 PDF File

LM25115
LM25115

Overview
LM25115 www.
ti.
com SNVS418A – NOVEMBER 2005 – REVISED APRIL 2013 LM25115 Secondary Side Post Regulator Controller Check for Samples: LM25115 FEATURES 1 •2 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 WSON-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.
Typical Application Circuit INPUT FEEDBACK Main Converter PWM Controller Phase Signal Main Output 3.
3V +12V LM25115 VCC Sync HB VBIAS HO RAMP HS SS LO CO COMP CS FB VOUT PGND AGND RS Auxiliary Output 2.
0V Figure 1.
Simplified Multiple Output Power Converter Utilizing SSPR Technique 1 Please b...


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