LT8331 datasheet(22/30 Pages) LINER

tên linh kiện	LT8331

Giải thích chi tiết về linh kiện	Low IQ Boost/SEPIC/ Flyback/Inverting Converter with 0.5A, 140V Switch

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LT8331

8331fa

For more information www.linear.com/LT8331

The ESR can be minimized by using high quality X5R or

X7R dielectric ceramic capacitors. In many applications,

ceramic capacitors are sufficient to limit the output volt-

age ripple.

The RMS ripple current rating of the output capacitor

needs to be greater than:

IRMS(COUT) > 0.3 • ∆IL2

Inverting Converter: Selecting the DC Coupling

Capacitor

The DC voltage rating of the DC coupling capacitor (CDC,

as shown in Figure 10) should be larger than the maximum

input voltage minus the output voltage (negative voltage):

VCDC > VIN(MAX) – VOUT

CDC has nearly a rectangular current waveform. During

the switch off-time, the current through CDC is IIN, while

approximately –IO flows during the on-time. The RMS

rating of the coupling capacitor is determined by the fol-

lowing equation:

IRMS(CDC) >IO(MAX) •

DMAX

− DMAX

A low ESR and ESL, X5R or X7R ceramic capacitor works

well for CDC.

APPLICATIONS INFORMATION

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