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42V, Secondary Side Post Regulator/Synchronous Buck Controller


Package | PIN: NHQ | 16
Temp: Q (-40 to 125)
Carrier: Cut Tape
Qty Price
1-9 $2.23
10-24 $2.01
25-99 $1.87
100-249 $1.64
250-499 $1.53
500-749 $1.30
750-999 $1.10
1000+ $1.05


  • 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

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Texas Instruments  LM25115SDX/NOPB

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.