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參數(shù)資料
| 型號： | ISL6551IRZ |
| 廠商： | INTERSIL CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | ZVS Full Bridge PWM Controller |
| 中文描述： | DUAL SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC28 |
| 封裝： | 6 X 6 MM, ROHS COMPLIANT, PLASTIC, MO-220VJJC, QFN-28 |
| 文件頁數(shù)： | 9/26頁 |
| 文件大?。?/td> | 604K |
| 代理商： | ISL6551IRZ |
9
FN9066.5
January 3, 2006
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.
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
ON
.
F (VDD UVLO) -
The IC is turned off when the VDD is below
the turn-off threshold VDD
OFF
. Hysteresis VDD
HYS
is
incorporated in the undervoltage lockout (UVLO) circuit.
LATSD
ON/OFF
ILIM_OUT
SOFT
START
DRIVER
ENABLE
SOFT-START
SHUTDOWN
PKILIM < BGREF
PKILIM > BGREF
FAULT
FAULT
OFF
OVER
CURRENT
LATCHED
OFF/ON
LATCH
RESET
UNDER VOLTAGE
LOCKOUT
VDD
ON
VDD
OFF
LATCH RESET BY
REMOVING VDD
VDD
A
B
C
D
E
F
LATCH CANNOT BE RESET BY ON/OFF
ISL6551
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