Design Tools

Power Factor Corrector

Design softwares are available to support all ST Power Factor Corrector controllers:

	L4981A
	L4981B
	L6561
	L6562

In high performance and high power applications the fixed frequency average current method, based on L4981A/B, is recommended.

The transition mode PWM (fixed on-time, variable frequency) using the L656x controllers is a friendly low cost approach for low-medium power application. L6562 is recommended for new designs.
Even though different topologies can be realized for power factor correction, these tools support the boost topology.
The boost inductor located between the mains bridge and the switch minimizes the noise generated at the input and therefore the requirements on the EMI filter.

PFC program is the design aid for L4981x and L6561: Download

L6562 program is the design aid dedicated to L6562 IC: Download

VIPer Switch Mode Power Supply Design

The VIPer Switch Mode Power Supply Design Software helps the user to design a switch mode power supply in flyback topology with both the first and second generation of VIPer devices.

The software starts by showing a typical switch mode power supply in flyback topology.

The designer can insert the input parameters, the output parameters and the VIPer needed for his own design and the software will give the billing of material (BOM) both in a graphic and a text version and will calculate the dissipated power of the complete converter as a sum of the dissipated power of all the engaged components.

The design tool calculates:

	the primary inductance
	the number and dimension of winding turns with the conditions of power dissipated in the transformer
	leakage inductance
	primary capacitance
	window factor utilization
	saturation flux density margin
	paralleled wires set by the designer

It also suggests the transformer geometry core and ferrite grade according to the internal core and ferrite grade database.

Download

Allows the user to perform a feasibility analysis for the preliminary design of a switch mode power supply in buck topology (positive output voltage) and buck-boost topology (negative output voltage).

Based on the input parameters, output parameters and the VIPer selected, the software will provide the bill of materials (BOM) in both text and graphic format. It will also calculate the total dissipated power as a sum of all the engaged components.

The design tool includes a detailed software guide for the step-by-step power supply design.

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