DC1580A Demonstration Circuit: LTC3856EUH High Efficiency Polyphase Buck Converter
The DC1580A is a high-efficiency polyphase synchronous buck converter using the LTC3856EUH, providing a 1.5V output at up to 50A from a 4.5V to 14V input range.
Overview
This document describes the design and operation of demonstration circuit 1580A, featuring the LTC3856EUH dual-phase synchronous buck controller. The converter is designed for an input range of 4.5V to 14V, delivering a regulated 1.5V output at currents up to 50A. The circuit supports stage shedding to enhance light-load efficiency and utilizes adaptive voltage positioning (AVP) for improved transient response. Users can configure the board for either sense resistor or inductor DCR current sensing, with temperature compensation for accurate current limiting. The switching frequency is pre-set to 400kHz but can be adjusted between 250kHz and 770kHz.
Use Cases
- Telecom and datacom systems
- Industrial and medical instruments
- DC power distribution systems
- Computer systems
Topics
Referenced Parts
LTC3856EUH
Analog Devices
The demo board uses the LTC®3856EUH controller.
B0530W
Diodes Inc.
D4 B0530W
A914BYW-150
Murata
L3 15uH A914BYW-150
SUD50N03-09P
Vishay Siliconix
Q9 SUD50N03-09P
50A
Maxim
14V input range. It can supply 50A maximum load
| LT1616ES6 | Analog Devices | U2 LT1616ES6 |
| CMDSH-3 | Central Semiconductor | D1 CMDSH-3 |
| RJK0305DPB | Renesas | Q1 RJK0305DPB |
| RJK0330DPB | Renesas | Q8 RJK0330DPB |
| LTC3856EUH | Analog Devices | The demo board uses the LTC®3856EUH controller. |
| B0530W | Diodes Inc. | D4 B0530W |
| A914BYW-150 | Murata | L3 15uH A914BYW-150 |
| SUD50N03-09P | Vishay Siliconix | Q9 SUD50N03-09P |
| 50A | Maxim | 14V input range. It can supply 50A maximum load |