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reference designLT3752-1

Analog Devices LT3752-1

LT3752/LT3752-1 - Active Clamp Synchronous Forward Controllers with Internal Housekeeping Controller

Overview

TopologyForward Converter
Input voltage150-400 V
Switching frequency100-500 kHz
Output 112 V / 16.7 A
IC revisionB

Description

The LT®3752/LT3752-1 are current mode PWM controllers optimized for an active clamp forward converter topology. A DC/DC housekeeping controller is included for improved efficiency and performance. The LT3752 allows operation up to 100V input and the LT3752-1 is optimized for applications with input voltages greater than 100V.

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 LT3752/LT3752-1 are available in a 38-lead plastic TSSOP package with missing pins for high voltage spacings.

Features

  • Input Voltage Range: LT3752: 6.5V to 100V, LT3752-1:Limited Only by External Components
  • Internal Housekeeping DC/DC Controller
  • 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 applications

  • Offline and HV Car Battery Isolated Power Supplies
  • Industrial, Automotive and Military Systems
  • 48V Telecommunication Isolated Power Supplies

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(mA)
Vaux(V)
RDC 1(Ω)
RDC 2(Ω)
RDC 3(Ω)
fswitch(kHz)
L(mH)
NPRI : NSEC : NAUX
ISAT(mA)
VT(V (AC))
L(mm)
W(mm)
H(mm)
Mount
Size
SamplesAvailability & Sample
750817020
SPECWE-OLLT Offline Flyback Transformers, 141 - 318 V (AC), 10 V
Simu­lation
Availability
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-OLLT Offline Flyback Transformers
Input Voltage 141 - 318 V (AC)
Output Voltage 110 V
Output Current 1150 mA
Auxiliary Voltage12 V
DC Resistance 124.8 Ω
DC Resistance 20.235 Ω
DC Resistance 30.4 Ω
Switching Frequency 150
Inductance4 mH
Turns Ratio9.33:1:1.17 
Saturation Current340 mA
Insulation Test Voltage4600 V (AC)
Length15 mm
Width15.75 mm
Height18.5 mm
MountTHT 
SizeEE13/6/6 
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