ISL6721 Datasheet, PDF(18/22 Page) Intersil Corporation – Flexible Single-ended Current Mode PWM Controller

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ISL6721 Datasheet, PDF (18/22 Pages) Intersil Corporation – Flexible Single-ended Current Mode PWM Controller

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ISL6721

4.375V OC fault threshold at which point the IC enters the

fault shutdown mode. Trace 2 shows the behavior of the

timing capacitor voltage during a shutdown fault. Most of the

functions of the IC are de-powered during a fault, and the

oscillator is among those functions. During a fault, the IC is

turned off until the restart delay has timed out. After the

delay, power is restored and the IC resumes normal

operation. Trace 3 is the GATE output during the soft-start

cycle and OC fault.

NOTE:

Trace 1: SYNC Output

Trace 2: RTCT Sawtooth

Trace 3: GATE Output

FIGURE 10. TYPICAL WAVEFORMS

NOTE:

Trace 1: VD-S

Trace 3: VG-S

FIGURE 12. GATE AND DRAIN-SOURCE WAVEFORMS

NOTE:

Trace 1: SS

Trace 2: RTCT Sawtooth

Trace 3: GATE Output

FIGURE 11. SOFT-START WITH OVERCURRENT FAULT

Figure 12 shows the switching FET waveforms during

steady state operation. Trace 1 is drain-source voltage and

Trace 2 is gate-source voltage.

FN9110.6

March 5, 2008

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