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LM3478EVM-FLY

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LM3478EVM-FLY

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Overview

The LM3478EVM-FLY evaluation module showcases a primary-side regulated flyback controller for wide input voltage range with fixed switching frequency of 400kHz. The PCB achieves high conversion efficiency and has 2 layers with components populated on 1 side.

Features
  • Primary-side regulated flyback controller
  • Isolated 20V output voltage rail
  • 14W output power
  • Auxiliary winding regulated to 5V
  • Programmable switching frequency
  • Programmable cycle-by-cycle current limiting
  • Shutdown pin
DC/DC controllers
LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current
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Evaluation board

LM3478EVM-FLY — LM3478 evaluation module

Supported products & hardware
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LM3478EVM-FLY — LM3478 evaluation module

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Calculation tool

LM3478-88-BOOST-CALC — LM3478-88 quick start calculator for boost

Supported products & hardware

Supported products & hardware

Products
DC/DC controllers
LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
Hardware development
Evaluation board
LM3478EVAL — High Efficiency Low-Side N-Channel Controller for Switching Regulator LM3478EVM-FLY — LM3478 evaluation module

LM3478-88-BOOST-CALC — LM3478-88 quick start calculator for boost

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Version: 1.1.0
Release date: Feb 14, 2025
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LM3478-88_Quickstart_Calculator_Boost_V1_1_0.zip  — 3474 K

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Products
DC/DC controllers
LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
Hardware development
Evaluation board
LM3478EVAL — High Efficiency Low-Side N-Channel Controller for Switching Regulator LM3478EVM-FLY — LM3478 evaluation module

Release Information

The LM3478-88 quick start calculator for boost tool supports the initial calculation of the boost power stage and of the necessary external components for a boost converter using LM3478 or LM3488 as regulation IC.

Version 1.1.0

What's new

  • Fixed Rsense calculation
Calculation tool

LM3478-88-FLYBACK-CALC — LM3478-88 quick start calculator for Flyback

Supported products & hardware

Supported products & hardware

Products
DC/DC controllers
LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
Hardware development
Evaluation board
LM3478EVAL — High Efficiency Low-Side N-Channel Controller for Switching Regulator LM3478EVM-FLY — LM3478 evaluation module

LM3478-88-FLYBACK-CALC — LM3478-88 quick start calculator for Flyback

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Version: 1.1.0
Release date: Feb 14, 2025
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download

LM3478-88_Quickstart_Flyback_V1_1_0.zip  — 4913 K

SHA-256 checksum
Products
DC/DC controllers
LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
Hardware development
Evaluation board
LM3478EVAL — High Efficiency Low-Side N-Channel Controller for Switching Regulator LM3478EVM-FLY — LM3478 evaluation module

Release Information

The LM3478-88 quick start calculator for Flyback topology supports the initial calculation of the power stage and of the necessary external components for a Flyback converter using LM3478 or LM3488 as regulation IC.

What's new

  • Fixed Rsense and Rt calculation
Calculation tool

LM3478-88-SEPIC-CALC — LM3478-88 quick start calculator for SEPIC

Supported products & hardware

Supported products & hardware

Products
DC/DC controllers
LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
Hardware development
Evaluation board
LM3478EVAL — High Efficiency Low-Side N-Channel Controller for Switching Regulator LM3478EVM-FLY — LM3478 evaluation module

LM3478-88-SEPIC-CALC — LM3478-88 quick start calculator for SEPIC

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Version: V1.0.0
Release date: Oct 31, 2024
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download

LM3478-88_Quickstart_Calculator_SEPIC_V1_0_0.zip  — 1096 K

SHA-256 checksum
Products
DC/DC controllers
LM3478 — 2.97~40V Wide Input Range Boost/SEPIC/Flyback DC-DC Controller LM3478Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 10-µA shutdown current LM3488 — 2.97V to 40V Wide Vin Low-Side N-Channel Controller for Switching Regulators LM3488Q-Q1 — 40-V wide VIN low-side N-channel controller for switching regulators with 5-µA shutdown current
Hardware development
Evaluation board
LM3478EVAL — High Efficiency Low-Side N-Channel Controller for Switching Regulator LM3478EVM-FLY — LM3478 evaluation module

Release Information

The LM3478-88 quick start calculator for SEPIC tool supports the initial calculation of the SEPIC power stage and of the necessary external components for a SEPIC converter using LM3478 or LM3488 as regulation IC.

What's new

  • Initial version
Certification

LM3478EVM-FLY-DOC-CERT — LM3478EVM-FLY EU Declaration of Conformity (DoC)

Supported products & hardware

Supported products & hardware

Hardware development
Evaluation board
LM3478EVM-FLY — LM3478 evaluation module

LM3478EVM-FLY-DOC-CERT — LM3478EVM-FLY EU Declaration of Conformity (DoC)

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Version: 1.0.0
Release date: Apr 24, 2026
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Hardware development
Evaluation board
LM3478EVM-FLY — LM3478 evaluation module

Documentation

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DoC_LM3478EVM-FLY.pdf

LM3478EVM-FLY Declaration of Conformity (DoC)

Release Information

LM3478EVM-FLY Declaration of Conformity (DoC)
TI's Standard Terms and Conditions for Evaluation Items apply.

Technical documentation

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Top documentation Type Title Format options Date
* EVM User's guide LM3478 Evaluation Module PDF | HTML Sep 4, 2026

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