ISL6551IRZ Intersil, ISL6551IRZ Datasheet - Page 9

• Manufacturer Part Number: ISL6551IRZ
• Description: IC CTRLR PWM FULL BRDG ZVS 28QFN
• Manufacturer: Intersil

Specifications of ISL6551IRZ

• Pwm Type: Current Mode
• Number Of Outputs: 6
• Frequency - Max: 1MHz
• Duty Cycle: 50%
• Voltage - Supply: 10.8 V ~ 13.2 V
• Buck: No
• Boost: No
• Flyback: Yes
• Inverting: No
• Doubler: No
• Divider: No
• Cuk: No
• Isolated: No
• Operating Temperature: 0°C ~ 85°C
• Package / Case: 28-VQFN Exposed Pad, 28-HVQFN, 28-SQFN, 28-DHVQFN
• Frequency-max: 1MHz
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

Shutdown Timing Diagrams
Shutdown Timing Descriptions
A (ON/OFF) - When the ON/OFF is pulled low, the soft-start
capacitor is discharged and all the drivers are disabled.
When the ON/OFF is released without a fault condition, a
soft-start is initiated.
B (OVERCURRENT) - If the output of the converter is over
loaded, i.e., the PKILIM is above the bandgap reference
voltage (BGREF), the soft-start capacitor is discharged very
quickly and all the drivers are turned off. Thereafter, the soft-
start capacitor is charged slowly, and discharged quickly if
the output is overloaded again. The soft-start will remain in
hiccup mode as long as the overload conditions persist.
Once the overload is removed, the soft-start capacitor is
charged up and the converter is then back to normal
operation.
C (LATCHING SHUTDOWN) - The IC is latched off
completely as the LATSD pin is pulled high, and the soft-start
capacitor is reset.
D (ON/OFF) - The latch cannot be reset by the ON/OFF.
LATSD
ON/OFF
ILIM_OUT
SOFT
START
DRIVER
ENABLE
SOFT-START
SHUTDOWN
VDD
FAULT
OFF
A
9
PKILIM < BGREF
PKILIM > BGREF
OVER
CURRENT
B
ISL6551
LATCHED
C
E (LATCH RESET) - The latch is reset by removing the
VDD. The soft-start capacitor starts to be charged after VDD
increases above the turn-on threshold VDD
F (VDD UVLO) - The IC is turned off when the VDD is below
the turn-off threshold VDD
incorporated in the undervoltage lockout (UVLO) circuit.
OFF/ON
D
LATCH CANNOT BE RESET BY ON/OFF
E
LATCH RESET BY
REMOVING VDD
VDD
LATCH
RESET
FAULT
ON
OFF
. Hysteresis VDD
UNDER VOLTAGE
LOCKOUT
F
VDD
ON
OFF
.
HYS
January 3, 2006
is
FN9066.5