LM5045 datasheet(25/46 Pages) TI

25 / 46 page

LM5045

www.ti.com

SNVS699H – FEBRUARY 2011 – REVISED JANUARY 2015

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LM5045 is a highly integrated PWM controller that contains all of the features necessary for implementing

full-bridge topology power converters using either current mode or voltage mode control. The device targets DC-

DC converter applications with input voltages of up to 100 Vdc and output power in the range 100 W to 1 kW.

8.2 Typical Application

The following schematic shows an example of a 100W full-bridge converter controlled by LM5045. The operating

input voltage range is 36 V to 75 V, and the output voltage is 3.3 V. The output current capability is 30 A. The

converter is configured for current mode control with external slope compensation. An auxiliary winding is used to

raise the VCC voltage to reduce the controller power dissipation.

Figure 19. Evaluation Board Schematic

8.2.1 Design Requirements

PARAMETERS

VALUE

Input operating range

36 V to 75 V

Output voltage

3.3 V

Measured efficiency at 48 V

92% at 30A

Frequency of operation

420 kHz

Board size

2.28 x 1.45 x 0.5 inches

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LM5045 Datasheet(PDF) 25 Page - Texas Instruments