Dual-Output Isolated Fly-Buck Reference Design With an Ultra-Small Coupled Inductor

(ACTIVE) PMP15005

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Key Document

Description

PMP15005 uses the LM5160 in a Fly-Buck™ topology with the primary and secondary output both set to 5V nominal. The circuit accommodates a voltage input range from 14V to 36V, ideal for the 24-V nominal input rail. While the primary side is set at 5.4V nominally using the feedback resistors, the secondary isolated side sees 5V, which is based on Coilcraft’s LPD8035V series coupled inductor set at a turns-ratio of 1:1. The maximum operating current on both the primary and secondary rails are set at 225mA each.  The switching frequency is set at 300 kHz nominal.

Features
  • 14V to 36Vin, +5V @225mA (dual) output, 2.25W (one non-isolated primary and one isolated secondary
  • ~85% peak efficiency
  • Compact and cost effective isolated solution with an off-the-shelf coupled inductor instead of custom transformer
  • Solution size: 32 x 22 mm (1.25 x 0.9 inch); max component height: 3.5mm
  • 3.5mm max height of coupled inductor helps in height-constraint applications

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Bill of Materials (BOM)

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Parametrics
 PMP15005.1
(Output Voltage 1)
PMP15005.2
(Output Voltage 2)
Vin (Min) (V)1414
Vin (Max) (V)3636
Vout (Nom) (V)55
Iout (Max) (A).225.225
Output Power (W)1.1251.125
Isolated/Non-IsolatedIsolatedNon-Isolated
Input TypeDCDC
TopologyFlybuckFlybuck

TI Devices (3)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM5160  LM5160 Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM5160-Q1  Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
LM5160A  LM5160A Wide Input 65V, 2A Synchronous Buck / Fly-Buck™ Converter  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM5160 Download Download
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LM5160-Q1 Download Download
LM5160A Download Download

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Technical Documents

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User guides (1)
Title Abstract Type Size (KB) Date Views TI Recommends
PDF 778 25 Jul 2016 21
Design files (6)
Title Abstract Type Size (KB) Date Views
ZIP 302 25 Jul 2016 11
PDF 343 25 Jul 2016 6
ZIP 337 25 Jul 2016 6
PDF 65 25 Jul 2016 6
PDF 59 25 Jul 2016 7
PDF 92 25 Jul 2016 14

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