SLAAE40 September   2021 DAC61402 , DAC61408 , DAC61416 , DAC71416 , DAC81404 , DAC81408 , DAC81416

 

  1.   Design Objective
  2.   Design Description
  3.   Power-Supply Scheme
  4.   Detailed Design Procedure for LM51571
  5.   Detailed Design Procedure for LM25576
  6.   Design Simulations
    1.     Transient Simulation Results
  7.   Design Featured Devices
  8.   Design References

Power-Supply Scheme

To generate the 24-V VCC supply, use LM51571 in boost configuration. The LM5157x-Q1 device is a wide input range, non-synchronous boost converter with integrated 50-V, 6.5-A (LM5157-Q1) or 50-V, 4.33-A (LM51571-Q1) power switch. The device can be used in boost, SEPIC, and flyback topologies.

The –24-V VSS supply is generated by using the LM25576 in an inverting buck boost configuration. Operating with an input voltage range of 6 V to 42 V, the LM25576 delivers 3 A of continuous output current with an integrated 170-mΩ N-Channel MOSFET