DC2513A: 12V @ 20A, 36 ~ 72 Vin

Summary

DC2513A is a high efficiency, high power density hybrid converter. It can deliver 12V/20A with an input voltage from 36V to 72V. This demo board features the LTC7821, which uses an architecture that merges soft-switching switched-capacitor topology with a traditional step-down converter to provide superior efficiency compared to the traditional switching architectures. It offers a high efficiency/high density and cost effective solution for non isolated intermediate bus applications in power distribution, datacom and telecom as well as emerging 48V automotive systems.

External MOSFETs switch at a 500kHz fixed frequency for this demo board and can be programmed from 200kHz to 1.5MHz. The LTC7821’s powerful 1Ω N-channel MOSFET gate drivers maximize efficiency and can drive multiple MOSFETs in parallel for higher power applications. Due to its current mode control architecture, multiple LTC7821s can be operated in a parallel, multiphase configuration with excellent current sharing and low output voltage ripple to enable much higher power applications. Other benefits include low EMI emissions due to a soft-switched front end and reduced MOSFET stress.

The LTC7821 design eliminates the inrush current typically associated with switched capacitor circuits by prebalancing the capacitors on start-up. The LTC7821 also monitors system voltage, current and temperature or faults, and uses a sense resistor for overcurrent protection. It stops switching and pulls the FAULT pin low when a fault condition occurs. An onboard timer can be set for appropriate restart/retry times.

Additional features include:

  • ±1% Output Voltage Accuracy

  • Over Temperature,

  • Clock Output for Multiphase Operation,

  • Power Good Output Signal,

  • Short-Circuit Protection,

  • Monotonic Output Voltage Start-Up,

  • Optional External Reference,

  • Undervoltage Lockout

  • Internal Charge Balance Circuitry.

Specifications

Manufacturer Linear Technology/Analog Devices
Category AC/DC and DC/DC Conversion
Sub-Category DC/DC SMPS - Single Output
Eval Board Part Number DC2513A-ND
Eval Board Supplier Analog Devices Inc.
Eval Board Normally In Stock
Topology Step Down
Outputs and Type 1 Non-Isolated
Output Voltage: Factory Set 12 V
Current Out 20 A
Voltage In 36 ~ 72 V
Efficiency @ Conditions >97%, 48V in, 12V @ 7.5 ~ 20 A
>96%, 36V in, 12V @ 2.5 ~ 20 A
>94%, 72V in, 12V @ 7 ~ 20 A
Voltage Out Range - Fixed
Features Light Load Mode
Power Good Output
Short Circuit Protection
Soft Start
Under Voltage Protection, Brown-Out
Voltage Reference
Switching Frequency 500 kHz
Standby Current [Typical] 240 µA
Quiescent Current [Typical] 500 µA
Component Count + Extras 92 + 45
Internal Switch No
Design Author Linear Technology
Application / Target Market Automotive
Industrial Power
Telecom
Standby Current [Maximum] - Not Given
Quiescent Current [Maximum] - Not Given
Main I.C. Base Part LM2595

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