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LM5119 10 and 5 volt high current power supply circuit diagr

2015-03-18 06:24  
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Using the LM5119 dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply can be designed a very simple and high efficiency power supply circuit .
The control method is based upon current mode control utilizing an emulated current ramp.
Current mode control provides inherent line feed-forward, cycle- by-cycle current limiting and ease of loop compensation.
The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications.
The switching frequency is programmable from 50kHz to 750kHz. The LM5119 drives external high-side and low-side NMOS power switches with adaptive dead-time control.
This LM5229 power supply circuit will provide 10 volts output at 4A on channel 1 and 5 volts at 8A on channel 2 .

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The input voltage required by this power supply circuit project is between 14 and 55 volts .
The switching frequency of this project is 230kHz .
Some component values were chosen as a compromise between the 10V and 5V outputs to allow identical components to be used on both outputs. This design can be reconfigured in a dual-channel interleaved configuration with a single 10V output which requires identical power channels.

In this power supply electronic project circuit based on the LM5119 interleaved operation can be enabled by shorting both outputs together , and using zero ohm resistors for R22 and R21. This shorts VCC2 to FB2 and COMP2 to COMP1 respectively. Also the channel2 feedback network C14, R6, and C15 should be removed. The easy re-configuration between two channel
and single channel operation will allow insight into the benefits of interleaved operation.
High current , high power switching power supply circuit diagram using LM5119 regulator