90V active clamp voltage mode PWM controller with P or N-channel clamp FET and 0.25V CS threshold


Product details


Topology Active-Clamp Forward, Forward Control method Feedforward, Voltage VCC (Min) (V) 8 VCC (Max) (V) 15 Duty cycle (Max) (%) 80 UVLO thresholds on/off (V) Programmable/2.5V Frequency (Max) (kHz) 1000 Operating temperature range (C) -40 to 125 Gate drive (Typ) (A) 3 Features Current Limiting, HV Start-up, Leading Edge Blanking, Soft Start, Supports NFET Clamp, Supports PFET Clamp, Thermal Shutdown 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


  • Internal Start-Up Bias Regulator
  • 3-A Compound Main Gate Driver
  • Programmable Line Undervoltage Lockout (UVLO)
    With Adjustable Hysteresis
  • Voltage Mode Control With Feed-Forward
  • Adjustable Dual-Mode Overcurrent Protection
  • Programmable Overlap or Deadtime Between the
    Main and Active Clamp Outputs
  • Volt × Second Clamp
  • Programmable Soft-Start
  • Leading Edge Blanking
  • Single Resistor Programmable Oscillator
  • Oscillator UP and DOWN Sync Capability
  • Precision 5-V Reference
  • Thermal Shutdown
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The LM5025 PWM controller contains all of the features necessary to implement power converters using the active clamp and reset technique. The device can be configured to control either a P-channel clamp switch or an N-channel clamp switch. 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 active clamp output can be configured for either a specified overlap time (for P-channel switch applications) or a specified deadtime (for N_channel applications). The two internal compound gate drivers parallel both MOS and bipolar devices, providing superior gate drive characteristics. This controller is designed for high-speed operation including an oscillator frequency range up to 1 MHz and total PWM and current sense propagation delays less than 100 ns.

The LM5025 includes a high-voltage start-up regulator that operates over a wide input range of 13 V to 90 V. Additional features include: line undervoltage lockout (UVLO), soft-start, oscillator UP and DOWN sync capability, precision reference and thermal shutdown.

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Exact equivalent in functionality and parametrics to the compared device:
LM5025A ACTIVE 90V active clamp voltage mode PWM controller with P or N-channel clamp FET and 0.5V CS threshold This product has performance improvement over LM5025.

Technical documentation

Design & development

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

Design tools & simulation

SNVM013A.ZIP (63 KB) - PSpice Model
SNVMBD8.TSC (2675 KB) - TINA-TI Reference Design
SNVMBD9.ZIP (26 KB) - TINA-TI Spice Model

Reference designs

Forward Converter (48V@0.8A) for POE Power Sourcing (PSE)
PMP7840 — This is an isolated, active clamp forward converter for Power Over Ethernet applicatioins. The circuit has an input voltage range of 8V-to-14V and a regulates the output to 48Vout @ 0.8A
Design files

CAD/CAE symbols

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

Ordering & quality

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