50/100-W Flyback reference design for audio applications PMP21516 (ACTIVE)

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Key Document

Description

This reference design implements a dual-output flyback using the cost effective LM5021 AC-DC Current-Mode PWM Controller. Universal line input is converted to both 24-V and 6-V outputs. The TLV1117 Fixed LDO Voltage Regulator converts the 6-V output to 3.3 V and can handle 0.2 A of current. The supply is designed for sustained operation at 50 W and is rated for peaks up to 100 W, which is ideal for the power requirements of audio signals.

Features
  • Universal line input to 24-V 2.25-A/4.5-A isolated output
  • Secondary output through an LDO outputs 3.3-V/200-mA with reduced noise
  • Up to 89% efficiency at full load without the need for a synchronous rectifier
  • Operates at 50 W of sustained power and 100 W peaks

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Schematic/Block Diagram

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Design Files

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Parametrics
 PMP21516.1
(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)264
Vout (Nom) (V)24
Iout (Max) (A)4.5
Output Power (W)108
Isolated/Non-IsolatedIsolated
Input TypeAC
TopologyFlyback- Non Sync

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5021  AC-DC current mode PWM controller  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available
TL431  Adjustable precision shunt regulator  Voltage references  Sample & Buy Not Available
TLV1117  Single Output LDO, 800mA, Fixed and Adj., Internal Current limit, Thermal Overload Protection  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5021 Download Download
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TL431 Download Download
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TLV1117 Download -
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 3185 04 Feb 2019
Design files (3)
Title Type Size (KB) Date
PDF 127 04 Feb 2019
PDF 62 04 Feb 2019
PDF 241 04 Feb 2019

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