UCC28C53_V01 datasheet(37/48 Pages) TI

37 / 48 page

CH1: Output Voltage AC Coupled, 200 mV/div

CH4: Output Current, 1 A/div

Figure 9-10. Output Voltage During 0.9-A to 2.7-A

Load Transient

Figure 9-11. Output Voltage Ripple at Full Load

(100 mV/div)

Figure 9-12. Output Voltage Behavior at Full Load Start-up (5 V/div)

10 Power Supply Recommendations

The absolute maximum supply voltage is 30 V of UCC28C52 , including any transients that may be present. If

this voltage is exceeded, device damage is likely.

Because no clamp is included in the device, the supply pin must be protected from external sources which could

exceed the 30-V level.

To prevent false triggering due to leading edge noises, an RC current sense filter may be required on CS. Keep

the time constant of the RC filter well below the minimum on-time pulse width.

To prevent noise problems with high-speed switching transients, bypass VREF to ground with a ceramic

capacitor close to the IC package. A minimum of 0.1-µF ceramic capacitor is required. Additional VREF

bypassing is required for external loads on the reference. An electrolytic capacitor may also be used in addition

to the ceramic capacitor.

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UCC28C53, UCC28C54, UCC28C55

UCC28C56H, UCC28C57H, UCC28C57L, UCC28C59

SLUSER8 – JUNE 2022

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UCC28C53 数据表(PDF) 37 Page - Texas Instruments