Product details

Topology Active-Clamp Forward, Duty cycle (Max) (%) 80 Supply voltage (Max) (V) 15 UVLO thresholds on/off (V) Programmable/1.25V Features Current Limiting, Dead Time Control, HV Start-up, Leading Edge Blanking, Programmable Max Duty Cycle, Programmable Soft Start, Supports NFET Clamp, Supports PFET Clamp, Synchronization Pin Operating temperature range (C) -40 to 125 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 3
Topology Active-Clamp Forward, Duty cycle (Max) (%) 80 Supply voltage (Max) (V) 15 UVLO thresholds on/off (V) Programmable/1.25V Features Current Limiting, Dead Time Control, HV Start-up, Leading Edge Blanking, Programmable Max Duty Cycle, Programmable Soft Start, Supports NFET Clamp, Supports PFET Clamp, Synchronization Pin Operating temperature range (C) -40 to 125 Rating Catalog Frequency (Max) (kHz) 1000 Gate drive (Typ) (A) 3
TSSOP (PW) 16 22 mm² 5 x 4.4 WSON (NHQ) 16 25 mm² 5 x 5
  • Current-Mode Control
  • Internal 100-V Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • High Bandwidth Optocoupler Interface
  • Programmable Line Undervoltage Lockout (UVLO)
    With Adjustable Hysteresis
  • Versatile Dual Mode Overcurrent Protection With
    Hiccup Delay Timer
  • Programmable Overlap or Deadtime between the
    Main and Active Clamp Outputs
  • Programmable Maximum Duty Cycle Clamp
  • Programmable Soft-Start
  • Leading Edge Blanking
  • Resistor Programmed 1-MHz Capable Oscillator
  • Oscillator Sync I/O Capability
  • Precision 5-V Reference
  • Current-Mode Control
  • Internal 100-V Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • High Bandwidth Optocoupler Interface
  • Programmable Line Undervoltage Lockout (UVLO)
    With Adjustable Hysteresis
  • Versatile Dual Mode Overcurrent Protection With
    Hiccup Delay Timer
  • Programmable Overlap or Deadtime between the
    Main and Active Clamp Outputs
  • Programmable Maximum Duty Cycle Clamp
  • Programmable Soft-Start
  • Leading Edge Blanking
  • Resistor Programmed 1-MHz Capable Oscillator
  • Oscillator Sync I/O Capability
  • Precision 5-V Reference

The LM5026 PWM controller contains all of the features necessary to implement power converters utilizing the active clamp and reset technique with current-mode control. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp and reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The device can be configured to control either a P-Channel or N-Channel clamp switch. The main gate driver features a compound configuration, consisting of both MOS and Bipolar devices, providing superior gate drive characteristics. The LM5026 can be configured to operate with bias voltages over a wide input range of 8 V to 100 V. Additional features include programmable maximum duty cycle, line undervoltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1-MHz capable oscillator with synchronization input and output capability, precision reference, and thermal shutdown.

The LM5026 PWM controller contains all of the features necessary to implement power converters utilizing the active clamp and reset technique with current-mode control. With the active clamp technique, higher efficiencies and greater power densities can be realized compared to conventional catch winding or RDC clamp and reset techniques. Two control outputs are provided, the main power switch control (OUT_A) and the active clamp switch control (OUT_B). The device can be configured to control either a P-Channel or N-Channel clamp switch. The main gate driver features a compound configuration, consisting of both MOS and Bipolar devices, providing superior gate drive characteristics. The LM5026 can be configured to operate with bias voltages over a wide input range of 8 V to 100 V. Additional features include programmable maximum duty cycle, line undervoltage lockout, cycle-by-cycle current limit, hiccup mode fault operation with adjustable timeout delay, PWM slope compensation, soft-start, 1-MHz capable oscillator with synchronization input and output capability, precision reference, and thermal shutdown.

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Technical documentation

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Type Title Date
* Data sheet LM5026 Active Clamp Current Mode PWM Controller datasheet (Rev. E) PDF | HTML 30 Nov 2015
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
EVM User's guide AN-1387 LM5026 Evaluation Board (Rev. A) 06 May 2013
Application note Operation and Benefits of Active-Clamp Forward Power Converters 22 Mar 2007

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM5026EVAL — Active Clamp Current Mode PWM Controller

LM5026 Active Clamp Current Mode PWM Controller

Not available on TI.com
Simulation model

LM5026 Unencrypted PSpice Transient Model

SNVM015.ZIP (896 KB) - PSpice Model
Reference designs

PMP22075 — High efficiency 12-V, 5-A active clamp forward with 9-V to 60-V wide input range reference design

This forward-converter reference design is designed for an isolated 60-W, 12-V intermediate bus voltage rail. It operates in a wide-input range of 9 V to 60 V. The design features LM5026, a 100-V active clamp current mode PWM controller. A self-driven secondary rectifier with UCC27511 4-A and 8-A (...)
Schematic: PDF
Reference designs

PMP11478 — 30W Active Clamp Forward Converter Reference Design

PMP11478 is an isolated active clamp forward converter accepts a voltage range of 24-36V and delivers a 12V output at 2.5A. This design uses the LM5026 active clamp current-mode controller. Output voltage regulation is maintained using an LMV431 shunt regulator and opto-coupler feedback. Schottky (...)
Schematic: PDF
Reference designs

PMP7895 — 12Vin+/-10%, 12Vout @ 1A Active Reset Flyback Converter Reference Design

The PMP7895 is an active reset flyback converter reference design.  The design accepts an input voltage of 12V+/-10%, and outputs 12V, capable of providing 1A of current to the load.
Schematic: PDF
Package Pins Download
TSSOP (PW) 16 View options
WSON (NHQ) 16 View options

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