UCC28056DBVT datasheet(29/55 Pages) TI2

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InRMSMin

ONMAX0

BST0

OutMax

255

110%

InRMSMin

InMax

OutMax

InEqMin

110% P

BST

InEqMin1

ONMAX0

FF1

2 L

u BST

InEqMin0

ONMAX0

2 L

UCC28056

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SLUSD37E – OCTOBER 2017 – REVISED NOVEMBER 2019

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9.2.1 Design Requirements

For this design example, use the parameters listed in the table below as the input parameters.

Table 1. System Design Specifications

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNITS

INPUT CHARACTERISTICS

AC Voltage range

265

VAC

AC Voltage frequency

OUTPUT CHARACTERISTICS

Output Power, POutMax

85 VAC to 265 VAC

165

9.2.2 Detailed Design Procedure

9.2.2.1 Custom Design With WEBENCH® Tools

Click here to create a custom design using the UCC28056 controller with the WEBENCH® Power Designer.

1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.

2. Optimize the design for key parameters (efficiency, footprint,cost) using the optimizer dial.

3. Compare the generated design with other possible solutions from Texas Instruments.

The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time

pricing and component availability.

In most cases, these actions are available:

•

Run electrical simulations to see important waveforms and circuit performance

•

Run thermal simulations to understand board thermal performance

•

Export customized schematic and layout into popular CAD formats

•

Print PDF reports for the design, and share the design with colleagues

Get more information about WEBENCH tools at www.ti.com/WEBENCH.

9.2.2.2 Power Stage Design

The first step in the power stage design is to calculate the PFC inductor value needed to achieve the

specification, then the ratings for all other power components can be computed.

9.2.2.2.1

Boost Inductor Design

The minimum equivalent resistance presented, to the Line, by the input of the Boost PFC stage changes

according to the current Line Feed-Forward setting. RInEqMin0 and RInEqMin1 present the minimum equivalent input

resistance for the first two Line Feed-Forward levels.

(13)

(14)

Equation 15 calculates the maximum input power that can be drawn from a given Line voltage. The maximum

input power is set to 110% of POutMax to account for power stage efficiency.

(15)

Equation 16 calculates the Boost inductance value required to ensure that maximum load can be delivered from

minimum Line voltage.

(16)

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