LM25115A Series

42V, Secondary Side Post Regulator/Synchronous Buck Controller with Power-Up/Power-Down Tracking

Catalog

42V, Secondary Side Post Regulator/Synchronous Buck Controller with Power-Up/Power-Down Tracking

Part	Applications	Mounting Type	Voltage - Input [Max]	Package / Case	Current - Supply	Operating Temperature [Max]	Operating Temperature [Min]	Voltage - Supply [Min]	Voltage - Supply [Max]	Supplier Device Package	Package / Case [x]	Package / Case [y]
Texas Instruments LM25115SD/NOPB	Secondary-Side Controller	Surface Mount	42 V	16-WFDFN Exposed Pad	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-WSON (5x5)
Texas Instruments LM25115MT/NOPB	Secondary-Side Controller	Surface Mount	42 V	16-TSSOP	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-TSSOP	0.173 in	4.4 mm
Texas Instruments LM25115AMT	Secondary-Side Controller	Surface Mount	42 V	16-TSSOP	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-TSSOP	0.173 in	4.4 mm
Texas Instruments LM25115MTX/NOPB	Secondary-Side Controller	Surface Mount	42 V	16-TSSOP	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-TSSOP	0.173 in	4.4 mm
Texas Instruments LM25115MT	Secondary-Side Controller	Surface Mount	42 V	16-TSSOP	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-TSSOP	0.173 in	4.4 mm
Texas Instruments LM25115AMT/NOPB	Secondary-Side Controller	Surface Mount	42 V	16-TSSOP	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-TSSOP	0.173 in	4.4 mm
Texas Instruments LM25115MTX	Secondary-Side Controller	Surface Mount	42 V	16-TSSOP	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-TSSOP	0.173 in	4.4 mm
Texas Instruments LM25115SDX	Secondary-Side Controller	Surface Mount	42 V	16-WFDFN Exposed Pad	4 mA	125 °C	-40 °C	4.5 V	30 VDC	16-WSON (5x5)

Catalog

42V, Secondary Side Post Regulator/Synchronous Buck Controller with Power-Up/Power-Down Tracking

Key Features

• Self-synchronization to Main Channel OutputFree-run Mode for Buck Regulation of DC InputLeading Edge Pulse Width ModulationVoltage-mode Control with Current Injection and Input Line Feed-forwardOperates from AC or DC Input up to 42VWide 4.5V to 30V Bias Supply RangeWide 0.75V to 13.5V Output Range.Top and Bottom Gate Drivers Sink 2.5A PeakAdaptive Gate Driver Dead-time ControlWide Bandwidth Error Amplifier (4MHz)Programmable Soft-startThermal Shutdown ProtectionTSSOP-16 or Thermally Enhanced WSON-16 PackagesAll trademarks are the property of their respective owners.Self-synchronization to Main Channel OutputFree-run Mode for Buck Regulation of DC InputLeading Edge Pulse Width ModulationVoltage-mode Control with Current Injection and Input Line Feed-forwardOperates from AC or DC Input up to 42VWide 4.5V to 30V Bias Supply RangeWide 0.75V to 13.5V Output Range.Top and Bottom Gate Drivers Sink 2.5A PeakAdaptive Gate Driver Dead-time ControlWide Bandwidth Error Amplifier (4MHz)Programmable Soft-startThermal Shutdown ProtectionTSSOP-16 or Thermally Enhanced WSON-16 PackagesAll trademarks are the property of their respective owners.

Description

The LM25115A 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. LM25115A can be also used as a standalone DC/DC synchronous buck controller (Refer to 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 LM25115A 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. The LM25115A 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. LM25115A can be also used as a standalone DC/DC synchronous buck controller (Refer to 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 LM25115A 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.