LT3753 - Active Clamp Synchronous Forward Controller

The LT®3753 is a current mode PWM controller optimized for an active clamp forward converter topology, allowing up to 100V input operation.

A programmable volt-second clamp allows primary switch duty cycles above 50% for high switch, transformer and rectifier utilization. Active clamp control reduces switch voltage stress and increases efficiency. A synchronous output is available for controlling secondary side synchronous rectification.

The LT3753 is available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.

Features
  • Input Voltage Range: 8.5V to 100V
  • Programmable Volt-Second Clamp
  • High Efficiency Control: Active Clamp, Synchronous Rectification, Programmable Delays
  • Short-Circuit (Hiccup Mode) Overcurrent Protection
  • Programmable Soft-Start/Stop
  • Programmable OVLO and UVLO with Hysteresis
  • Programmable Frequency (100kHz to 500kHz)
  • Synchronizable to an External Clock
Typical Application
LT3753 Typical Application
Applications
  • Industrial, Automotive and Military Systems
  • 48V Telecommunication Isolated Power Supplies
Packaging
LT3753 Package Drawing
Order Information
Part NumberPackageTempPrice(1-99)Price (1k)*
LT3753EFE#PBFTSSOP-38E$4.29$3.19
LT3753EFE#TRPBFTSSOP-38E$3.25
LT3753HFE#PBFTSSOP-38H$5.13$3.80
LT3753HFE#TRPBFTSSOP-38H$3.86
LT3753IFE#PBFTSSOP-38I$4.70$3.51
LT3753IFE#TRPBFTSSOP-38I$3.57
LT3753MPFE#PBFTSSOP-38MP$12.69$9.80
LT3753MPFE#TRPBFTSSOP-38MP$9.86
Demo Boards
Part NumberDescriptionPrice
DC2050ALT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 36V ≤ VIN ≤ 72V; VOUT = 5V @ 20A$200.00
DC2306ALT3753EFE Isolated Demo Board | Forward Converter, 10V ≤ VIN ≤ 54V; VOUT = 48V or 54V (Jumper Selectable) @ 1.5A$200.00
DC2324A-ALT3753EFE Demo Board | Isolated Forward Converter, 36V ≤ VIN ≤ 72V; VOUT = 24V @ 5AContact Factory
DC2324A-BLT3753EFE Demo Board | Isolated Forward Converter, 18V ≤ VIN ≤ 36V; VOUT = 24V @ 5AContact Factory
DC2324A-CLT3753EFE Isolated Demo Board | Sync Forward Controller with Active Clamp, 9V ≤ VIN ≤ 18V; VOUT = 24V @ 4AContact Factory
Datasheet
Reliability Data
Press Release
CAD Symbol
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