ZXRD1050PQ16 datasheet(21/28 Pages) DIODES

Part #	ZXRD1050PQ16

Description	HIGH EFFICIENCY SIMPLESYNC??PWM DC-DC CONTROLLERS

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Manufacturer	DIODES [Diodes Incorporated]

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SimpleSync

TM and Shoot-Through

Steady state operation under constant load gives

an excellent indication of the ZXRD series

performance and also demonstrates how well

SimpleSync

TM

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).

Fig3. Main & Synchronous gate waveforms

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.4 0.5A Main & VOUT Waveforms

Fig.5 4A Main & VOUT Waveforms

Fig.2. Startup Waveform for 3.3V output .

21

ZXRD1000 SERIES

ISSUE 4 - OCTOBER 2000

Similar Part No. - ZXRD1050PQ16

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