ZXRD1033NQ16TC 데이터 시트보기 (PDF) - Zetex => Diodes

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ZXRD1033NQ16TC

HIGH EFFICIENCY SIMPLESYNC PWM DC-DC CONTROLLERS

Zetex => Diodes 

ZXRD1000 SERIES

Output Voltage Ripple

Output voltage ripple is shown in Fig.4 and Fig. 5

for load currents of 0.5A and 4A respectively.

Output voltage ripple will be dependant, to a very

large extent, on the output capacitor ESR. (see

Applications Section for ripple calculation).

Fig.2. Startup Waveform for 3.3V output .

SimpleSyncTM and Shoot-Through

Steady state operation under constant load gives

an excellent indication of the ZXRD series

performance and also demonstrates how well

SimpleSyncTM w o r k s. T he Si mp le Sy n cTM

technique drives the synchronous MOSFET gate

using the overwinding on the main inductor. It

also uses the high speed suppression characteristics

of the ferrite bead to prevent shoot through

currents. Fig.3 shows the gate waveforms for the

main and synchronous MOSFET devices (Zetex

ZXM64N02X).

Fig.4 0.5A Main & VOUT Waveforms

Fig3. Main & Synchronous gate waveforms

Fig.5 4A Main & VOUT Waveforms

ISSUE 4 - OCTOBER 2000

21

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