ISL6721ABZ Intersil, ISL6721ABZ Datasheet - Page 18

• Manufacturer Part Number: ISL6721ABZ
• Description: IC CTRLR PWM SGL ENDED 16-SOIC
• Manufacturer: Intersil

Specifications of ISL6721ABZ

• Pwm Type: Current Mode
• Number Of Outputs: 1
• Frequency - Max: 1MHz
• Duty Cycle: 100%
• Voltage - Supply: 9 V ~ 18 V
• Buck: Yes
• Boost: Yes
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: Yes
• Operating Temperature: -40°C ~ 105°C
• Package / Case: 16-SOIC (3.9mm Width)
• Frequency-max: 1MHz
• Peak Reflow Compatible (260 C): Yes
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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.
Figure 12 shows the switching FET waveforms during
steady state operation. Trace 1 is drain-source voltage and
Trace 2 is gate-source voltage.
NOTE:
NOTE:
Trace 1: SS
Trace 2: RTCT Sawtooth
Trace 3: GATE Output
Trace 1: SYNC Output
Trace 2: RTCT Sawtooth
Trace 3: GATE Output
FIGURE 11. SOFT-START WITH OVERCURRENT FAULT
FIGURE 10. TYPICAL WAVEFORMS
18
ISL6721
NOTE:
Trace 1: V
Trace 3: V
FIGURE 12. GATE AND DRAIN-SOURCE WAVEFORMS
D-S
G-S
March 5, 2008
FN9110.6