65W Active clamp flyback with Si FETs reference design for a high power density 5-20V AC/DC adapter
PMP21479
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Key Document

Description

This reference design uses the UCC28780 active clamp flyback controller to generate a 20-V/15-V/9-V/5-V adjustable output voltage. The maximum power rating is 65 W at 20-V output and up to 3 A at all other output voltage settings. This design reaches a peak efficiency of over 93% using silicon FETs, due to zero voltage switching (ZVS) and recaputuring the leakage energy.  The high efficiency enables a small form factor and a high power density.

Features
  • Zero voltage switching (ZVS) provides high efficiency (93.5% peak value)
  • Low, no load power consumption (33 mW)
  • Supports outputs of 5V/3A, 9V/3A, 15V/3A, and 20V/3.25A
  • Conducted emissions (EMI) data provided in test report
  • Small size (48mm x 48mm x 25mm) provides high power density (18W/in^3)

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Schematic/Block Diagram

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Design Files

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Parametrics
 PMP21479.1
(Output Voltage 1)
Vin (Min) (V)85
Vin (Max) (V)265
Vout (Nom) (V)20
Iout (Max) (A)3.25
Output Power (W)65
Isolated/Non-IsolatedIsolated
Input TypeAC
TopologyFlyback- Active Clamp

TI Devices (6)

Order samples, get tools and find more information on the TI products in this reference design.

Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ATL431  2.5V low-Iq adjustable precision shunt regulator  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
CSD17575Q3  30V, N ch NexFET MOSFET™, single SON3x3, 3.2mOhm  MOSFETs  Sample & Buy Not Available
TPS7B4250-Q1  Automotive 50mA 40V Voltage-Tracking LDO With 5mV Tracking Tolerance  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC24612  High-frequency multi-mode synchronous rectifier controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
UCC27712  620-V, 1.8-A, 2.8-A High-Side Low-Side Gate Driver with Interlock  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules
UCC28780  Adaptive zero voltage switching active-clamp flyback controller  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ATL431 Download Download
CSD17575Q3 VSON-CLIP (DQG)| 8 Download Download
TPS7B4250-Q1 Download Download
UCC24612 Download Download
UCC27712 Download Download
UCC28780 Download
Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 14717 13 Mar 2019
Design files (4)
Title Type Size (KB) Date
PDF 1165 13 Mar 2019
PDF 221 13 Mar 2019
PDF 307 13 Mar 2019
PDF 246 13 Mar 2019

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