UCC28C53_V01 datasheet(36/48 Pages) TI

36 / 48 page

GCLOSED

:s; = H

OPEN

:s;×

lCTR×ROPTO

RLED

p×lRCOMPp

RFBG

p×F

1 +

ks×C

COMPp × RCOMPp

nRCOMPz +@ 1

s × CCOMPz

RFBU

(53)

The final closed-loop bode plots are show in Figure 9-6 and Figure 9-7. The converter achieves a crossover

frequency of approximately 1.8 kHz and has a phase margin of approximately 67°.

TI recommends checking the loop stability across all the corner cases including component tolerances to ensure

system stability.

frequency (Hz)

100

1000

10000

100000

-40

-20

D003

Figure 9-6. Converter Closed-Loop Bode Plot –

Gain

frequency (Hz)

100

1000

10000

100000

-180

-135

-90

-45

D001

D004

Figure 9-7. Converter Closed-Loop Bode Plot –

Phase

9.2.3 Application Curves

Figure 9-8. Primary Side MOSFET Drain to Source

Voltage at 240-V AC Input (100 V/div)

Figure 9-9. Primary Side MOSFET Drain to Source

Voltage at 120-V AC Input (100 V/div)

UCC28C53, UCC28C54, UCC28C55

UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59

SLUSER8 – JUNE 2022

www.ti.com

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