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reference designLT8306

Analog Devices LT8306

60V Low IQ No-Opto Isolated Flyback Controller

Overview

TopologyFlyback Converter
Input voltage4.5-60 V
Switching frequency10-440 kHz
Output 115 V / 0.2 A

Description

The LT8306 is a micropower isolated flyback controller in a 6-lead ThinSOT™ package. By sampling the isolated output voltage directly from the primary-side flyback waveform, the part requires no third winding or opto-isolator for regulation. The output voltage is programmed with a single external resistor. Internal compensation and soft-start further reduce external component count. Boundary mode operation provides a small magnetic solution with excellent load regulation. Low ripple burst mode operation maintains high efficiency at light load while minimizing the output voltage ripple. The LT8306 drives a low side N-channel power MOSFET with 8V gate drive.The LT8306 has a wide input voltage range of 4.5V to 60V. The high level of integration and the use of boundary and low ripple burst modes result in a simple-to-use, low component count, and high efficiency application solution for isolated power delivery.

Features

  • Wide Input Voltage Range: 4.5V to 60V
  • Low Quiescent Current
  • 120μA in Sleep Mode
  • 390μA in Active Mode
  • Quasi-Resonant Boundary Mode Operation at Heavy Load
  • Low Ripple Burst Mode® Operation at Light Load
  • Minimum Load < 0.5% (Typ) of Full Output
  • VOUT Set with a Single External Resistor
  • 8V Gate Drive for External NFET
  • No Transformer Third Winding or Opto-Isolator Required for Regulation
  • Accurate EN/UVLO Threshold and Hysteresis
  • Internal Compensation and Soft-Start
  • Output Short-Circuit Protection
  • 6-Lead TSOT-23 Package
  • AEC-Q100 Qualified for Automotive Applications

Typical applications

  • Power Supplies,
  • Automotive
  • Medical
  • Industrial
  • Isolated Telecom

More information

Products

Order Code
Data­sheet
Simu­lation
Downloads
Status
Product series
VIN
VOut1(V)
IOut1(A)
VOut2(V)
IOut2(A)
VOut3(V)
IOut3(A)
VOut4(V)
IOut4(A)
Vaux(V)
L(µH)
n
ISAT(A)
LS(µH)
VT(V (AC))
Size
IC Reference
SamplesAvailability & Sample
750311911
SPECWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748, 8 - 24 V (DC), 15 V
Simu­lation
Availability
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Status Activei| Production is active. Expected lifetime: >10 years.
Product seriesWE-FB Flyback Transformer suitable for LT3573/ LT3574/ LT3575/ LT3748
Input Voltage 8 - 24 V (DC)
Output Voltage 115 V
Output Current 10.2 A
Output Voltage 215 V
Output Current 20.2 A
Output Voltage 315 V
Output Current 30.2 A
Output Voltage 415 V
Output Current 40.2 A
Auxiliary Voltage5 V
Inductance6.78 µH
Turns Ratio1:3:3:3:3:1 
Saturation Current13 A
Leakage Inductance0.2 µH
Insulation Test Voltage1500 V (AC)
SizeEE20/10/6 
IC ReferenceLT3748 
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