Half-bridge PWM controller with integrated auxiliary bias supply and regulated pre-biased start-up


Product details


Topology Full-Bridge, Half-Bridge, Push-Pull Control method Feedforward, Voltage Duty cycle (Max) (%) 50 UVLO thresholds on/off (V) Programmable/1.25V Frequency (Max) (kHz) 2000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 2 Features Current Limiting, Frequency Synchronization, HV Start-up, Input Line Monitor, Integrated Switch, Leading Edge Blanking, Multi-topology, Pre-Bias Start-Up, Soft Start, Synchronization Pin, Thermal Shutdown, Wide DC input Rating Catalog open-in-new Find other PWM controllers & resonant controllers

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WQFN (RJB) 28 25 mm² 5 x 5 open-in-new Find other PWM controllers & resonant controllers


  • High integration controller for small form factor, high-density DC-DC power converters
  • Integrated 100-V, 100-mA auxiliary bias supply
  • Fully regulated pre-biased start-up
  • Enhanced cycle-by-cycle current limiting with pulse matching for low and high primary FETs
  • Optimized maximum duty cycle for primary-side FETs
  • Voltage-mode control with input voltage feed-forward
  • 100-V high-voltage start-up regulator
  • Configurable latch, OVP operation
  • Integrated 100-V, 2-A MOSFET drivers for primary-side FETs
  • Programmable dead-time between primary-side and synchronous rectifier (SR) FETs
  • Create a custom design using the LM5036 with the Excel Calculator Tool or WEBENCH® Power Designer

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The LM5036 device is a PWM controller, with integrated auxiliary bias supply, offering high power density for industrial isolated power applications. It contains all the features necessary to implement half-bridge power converters, using voltage-mode control, with input voltage feed-forward. This device is intended to operate on the primary side of an isolated converter with DC input voltage up to 100-V. LM5036 includes features that improve power density and reliability while reducing system cost:

  • An integrated fly-buck converter as auxiliary bias supply. Provides bias power for both primary and secondary circuits, with a minimum of external components.
  • Fully regulated pre-bias start-up. Eliminates output voltage over-shoot or dips even when starting into a pre-charged output capacitor.
  • Enhanced cycle-by-cycle peak current limit with pulse matching. LM5036 limits both positive and negative current. Pulse matching ensures equal pulse width for low and high side devices, to avoid transformer saturation. Output current limit is approximately constant across the full range of input voltage.

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Technical documentation

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Type Title Date
* Datasheet LM5036 Half-Bridge PWM Controller with Integrated Auxiliary Bias Supply datasheet (Rev. B) May 31, 2018
User guide LM5036EVM-294 Evaluation Module Mar. 29, 2018

Design & development

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Hardware development


The LM5036EVM-294 is an EVM for a half-bridge PWM controller with an integrated auxiliary bias supply.  This EVM accepts a DC input up to 75 V, delivers a nominal output voltage of 12 VDC, an output current of 8 A, and a current limit of 10 A.

  • Integrated 100V auxiliary bias supply
  • Fully regulated pre-biased start-up
  • Enhanced cycle-by-cycle current limiting with pulse matching
  • Programmable latch operation
  • Optimized maximum on-time for primary-side switches
  • Integrated 100V high voltage startup regulator

Design tools & simulation

SNVMBP8.ZIP (1687 KB) - PSpice Model
SLUC654A.ZIP (418 KB)

Reference designs

54-Vdc input, 12-V 4-A output half-bridge reference design
PMP40500 — This 12-V, 42-A output half-bridge reference design is for bus converters in wired networking campus and branch switches. The design features high efficiency and various fault protections (over-current, short-circuit). The guide provides a efficiency comparison using 3kVrms basic and functional (...)
document-generic Schematic

CAD/CAE symbols

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WQFN (RJB) 28 View options

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