LM5026

ACTIVE

100-V active clamp current mode PWM controller with P or N-channel clamp FET and CS restart timer

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Product details

Parameters

Topology Active-Clamp Forward, Forward Control method Current VCC (Min) (V) 8 VCC (Max) (V) 15 Duty cycle (Max) (%) 80 UVLO thresholds on/off (V) Programmable/1.25V Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 3 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 Rating Catalog open-in-new Find other PWM controllers & resonant controllers

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 WSON (NHQ) 16 25 mm² 5 x 5 open-in-new Find other PWM controllers & resonant controllers

Features

  • 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
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Description

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
* Datasheet LM5026 Active Clamp Current Mode PWM Controller datasheet (Rev. E) Nov. 30, 2015
Selection guides Power Management Guide 2018 (Rev. R) Jun. 25, 2018
User guides AN-1387 LM5026 Evaluation Board (Rev. A) May 06, 2013
Application notes Operation and Benefits of Active-Clamp Forward Power Converters Mar. 22, 2007

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
149
Description

LM5026 Active Clamp Current Mode PWM Controller

Features
  • Current Mode Control
  • Internal 100V Start-up Bias Regulator
  • 3A Compound Main Gate Driver
  • High Bandwidth Opto-coupler Interface
  • Programmable Line Under-Voltage Lockout (UVLO) with Adjustable Hysteresis
  • Versatile Dual Mode Over-Current Protection with Hiccup Delay Timer
  • Programmable Overlap or Deadtime (...)

Design tools & simulation

SIMULATION MODELS Download
SNVM015.ZIP (896 KB) - PSpice Model

Reference designs

REFERENCE DESIGNS Download
High efficiency 12-V/5-A active clamp forward with wide input range 9-V to 60-V reference design
PMP22075 — This forward converter reference design was designed for an isolated 60W intermediate bus voltage rail 12V. It operates in a wide input range 9V to 60V. It features LM5026—100V active clamp current mode PWM controller. A self-driven secondary rectifier with UCC27511 4A/8A driver was used for (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
30W Active Clamp Forward Converter Reference Design
PMP11478 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 (...)
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
12Vin+/-10%, 12Vout @ 1A Active Reset Flyback Converter Reference Design
PMP7895 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.
document-generic Schematic document-generic User guide
REFERENCE DESIGNS Download
Wide Input Active Clamp Forward Converter with Isolated Output
PMP7892 PMP7892 is an isolated active clamp forward converter capable of 42W output power. 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 rectifiers allow for holdup of 10ms using (...)

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 16 View options
WSON (NHQ) 16 View options

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