LT8302
LT8302-3

RECOMMENDED FOR NEW DESIGNS

42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch

Data Sheet (Rev. G) Product Selection Table
Part Models
34
1ku List Price
Starting From $4.09
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Part Details

  • 3V to 42V Input Voltage Range
  • 3.6A, 65V Internal DMOS Power Switch
  • Low Quiescent Current:
    • 106µA in Sleep Mode
    • 380µA 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
  • No Transformer Third Winding or Opto-Isolator Required for Output Voltage Regulation
  • Accurate EN/UVLO Threshold and Hysteresis
  • Internal Compensation and Soft-Start
  • Temperature Compensation for Output Diode
  • Output Short-Circuit Protection
  • Thermally Enhanced 8-Lead SO Package
  • AEC-Q100 Qualified for Automotive Applications
LT8302
LT8302-3
42VIN Micropower No-Opto Isolated Flyback Converter with 65V/3.6A Switch
LT8302 Application Circuit LT8302 Pin Configuration LT8302 Performance Graph
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Design Note 1

Technical Articles 3

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Hardware Ecosystem

Parts Product Life Cycle Description
Ideal Diode Bridge 1
LT4320
LT4320-1
Ideal Diode Bridge Controller
Surge Stopper, Overvoltage, and Overcurrent Protection 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 4

Models for the following parts are available in LTspice:

  • LT8302
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
DC2821A

LT8302ES8E Demo Board|No-Opto Isolated Flyback 4V ≤ VIN ≤ 28V VOUT = 12V at up to 1.4A

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Product Details

Demonstration circuit 2821A is a compact no-opto isolated flyback converter featuring the LT8302. The DC2821A outputs 12V, and maintains ±1% (typ) regulation with a load current from 5mA up to 1.4A and over an input voltage from 4V to 28V. The output current capability increases with the input voltage.

Transformer leakage inductance causes a voltage spike on the primary side after the power switch turns off. To limit this leakage inductance spike within the MOSFET voltage rating of 65V, an RC snubber and a TVS clamp are installed to damp the ringing and clamp the MOSFET drain voltage to a safe level.

The demo circuit can be easily modified for different applications using predesigned transformers.

The LT8302 data sheet gives a complete description of the part, operation and application information. The data sheet must be read in conjunction with the quick start guide for DC2821A.

eval board
schematic 5
DC2906A

LT8302 Demo Board | Isolated Triple Output 5V, ±15V Flyback Converter

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Product Details

Demonstration circuit 2906A is an isolated triple output flyback converter featuring the LT8302. The DC2906A operates over a wide input voltage range of 4.5V to 28V and samples the primary-side flyback waveform to regulate the secondary side output voltages. It generates three isolated output rails: 5V at 400mA+ and ±15V at 100mA+. Line and load regulation (combined) is within ±10%. 

DC2906A showcases the high power density, high efficiency and good regulation that is possible due to the LT8302's high level of integration.

eval board
schematic 6
schematic 7
schematic 8
schematic 9
schematic 10
DC2014A

LT8302ES8E Isolated Demo Board | 10V ≤ VIN ≤ 30V, VOUT = 5V at 2.2A

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Product Details

Demonstration circuit 2014A is a micropower No-Opto isolated flyback converter featuring the LT8302. This demo circuit outputs 5V, and maintains tight regulation with a load current from 10mA to 2.2A over an input voltage from 10V to 30V. The output current capability increases with the input voltage.


 
DC2821A
LT8302ES8E Demo Board|No-Opto Isolated Flyback 4V ≤ VIN ≤ 28V VOUT = 12V at up to 1.4A
DC2821A Evaluation Board DC2821A Evaluation Board - Top View DC2821A Evaluation Board - Bottom View DC2821A_UG-1366 Application Circuit
DC2906A
LT8302 Demo Board | Isolated Triple Output 5V, ±15V Flyback Converter
DC2906A
DC2014A
LT8302ES8E Isolated Demo Board | 10V ≤ VIN ≤ 30V, VOUT = 5V at 2.2A
DC2014A Demo Board DC2014A Demo Board DC2014A Demo Board DC2014A Demo Board DC2014A - Schematic

Reference Designs

Figure 1. CN0509 Wide Range Isolated Device Charger Simplified Schematic
Figure 1. CN0509 Wide Range Isolated Device Charger Simplified Schematic
EVAL-CN0509-EBZ (Angle View)
EVAL-CN0509-EBZ (Top View)
EVAL-CN0509-EBZ (Bottom View)
CN0509 Circuits from the lab

Wide Input Voltage Range, Dual USB Port Charger

View Detailed Reference Design

Features and Benefits

  • Wide DC input voltage range (5V - 100V) USB Charger
  • Reverse polarity protection
  • Dual port charging capable with one Dedicated charging port (DCP)
CN0509
Wide Input Voltage Range, Dual USB Port Charger
Figure 1. CN0509 Wide Range Isolated Device Charger Simplified Schematic
EVAL-CN0509-EBZ (Angle View)
EVAL-CN0509-EBZ (Top View)
EVAL-CN0509-EBZ (Bottom View)

Latest Discussions

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RE: LT8302 oscillating output
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RE: LT8302 Not Workin
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