48-V / 25-A negative-to-positive synchronous buck-boost reference design for power amplifiers
PMP21943
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Key Document

Description

This reference design is a negative-to-positive synchronous buck-boost converter for power amplifier applications. The circuit is powered from the nominal -48-V system source to provide an output voltage of +48 V at 25 A. The design uses two dual synchronous boost controllers for 4-phase operation at a switching frequency of 150 kHz. Output voltage adjustment to +30 V is jumper selectable. 1- through 4-phase operation is also jumper selectable.

Features
  • Non-isolated inverting solution for higher power
  • Excellent phase current sharing for balanced thermal performance
  • Jumper selectable phase control
  • Compact design for minimum solution size
  • Jumper selectable output voltage control

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Parametrics
 PMP21943.1
(Output Voltage 1)
Vin (Min) (V)-36
Vin (Max) (V)-60
Vout (Nom) (V)48
Iout (Max) (A)25
Output Power (W)1200
Isolated/Non-IsolatedNon-Isolated
Input TypeDC
TopologyBuck Boost- Synchronous

TI Devices (7)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM4040-N  100-ppm/°C precision micropower shunt voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
LM5018  7.5-100V Wide Vin, 300mA Constant On-Time Synchronous Buck Regulator  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
LM5170-Q1  Multiphase Bidirectional Current Controller  Buck-boost & inverting  Sample & Buy View Design Kits & Evaluation Modules
LM8261  RRIO, High Output Current & Unlimited Cap Load Op Amp in SOT23-5  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TLV7021  Low power, small size comparator with open-drain output  Amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-IQ wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC21225A  4-A, 6-A, 2.5-kVRMS isolated dual-channel gate driver in LGA  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM4040-N Download Download
Download Download
Download Download
LM5018 Download Download
Download Download
LM5170-Q1 Download -
LM8261 Download Download
TLV7021 Download
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TPS709 Download
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UCC21225A Download Download

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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 2566 10 Sep 2019
Design files (6)
Title Type Size (KB) Date
ZIP 761 10 Sep 2019
ZIP 2693 10 Sep 2019
PDF 3066 10 Sep 2019
PDF 337 10 Sep 2019
PDF 108 10 Sep 2019
PDF 698 10 Sep 2019

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