UCC28C53_V01 datasheet(23/48 Pages) TI

23 / 48 page

9 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, as well as validating and testing their design

implementation to confirm system functionality.

9.1 Application Information

The UCCx8C5x controllers are peak current mode pulse width modulators. These controllers have an onboard

amplifier and can be used in isolated and nonisolated power supply designs. The onboard totem pole gate

driver is capable of delivering 1 A of peak current. This high-speed PWM is capable of operating at switching

frequencies up to 1 MHz. As UCCx8C5x can be used to directly substitute UCCx8C4x by drop-in, the design

steps are the same as those for UCCx8C4x. The same design example, including the layout, of UCCx8c4x is

re-used for UCCx8C5x in the below. Figure 9-1 shows a typical off-line application using UCC38C44.

C53

REF

VCC

UCC38C44

C13

R16

R12

C12

D50

C52

D51

R10

R11

C18

C1A

BR1

RT1

L50

C54

R55

R53

R56

C55

R52

SEC

COMMON

12 V

OUT

R50

C50

C51

R50

IC3

R54

5 V

OUT

IC2

1 COMP

2 FB

3 CS

4 RT/CT

OUT

GND

AC Input

100 V

– 240 V

EMI Filter

Required

Figure 9-1. Typical Off-Line Application

Figure 9-2 shows a forward converter with synchronous rectification. This application provides 48 V to 3.3 V at

10 A with over 85% efficiency, and uses the UCC38C42as the secondary-side controller and UCC3961 as the

primary-side startup control device.

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UCC28C53, UCC28C54, UCC28C55

UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59

SLUSER8 – JUNE 2022

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