ISL6722A Datasheet, PDF (3/24 Pages) Intersil Corporation – Flexible Single Ended Current Mode PWM

ISL6722A, ISL6723A
Functional Block Diagram (ISL6723A)
VCC
LGND
START/STOP
UV COMPARATOR
VREF
5V
1%
+
ENABLE
-
BG ^+-
ISET
ISENSE
5k
RESTART
DELAY
0.8
VREF
+
S
53µA _{+ 100mV}
- OC DETECT
+
OVERCURRENT
COMPARATOR
SS CHARGE
VOLTAGE CLAMP
SS CHARGED
SHTDN
SOFT-START
CHARGE 70µA
CURRENT
ON
OC
FAULT
OC
25µA
+
-
4.375V
SS DCHGON
OVERCURRENT
SHUTDOWN
DELAY
SS CHG
SLOPE
0.1
COMP
SS
SS CLAMP
+
-
VFB
2.5V
ERROR
AMPLIFIER
+
-
PWM
COMPARATOR
+
-
1/3
100nS ^START
BLANKING
SS LOW
-
+
FAULT
LATCH
SS LOW 270mV
COMPARATOR
SQ
RQ
SET DOMINANT
VREF
VREF
UV COMPARATOR
4.65V _-
+
BG
VREF
SS
15µA
VREF
20k
3.0V/
1.5V ^12k
ON
30k
RTCT
VREF
OSCILLATOR
COMPARATOR
-
+
1mA
ON
SQ
BI-DIRECTIONAL
SYNCHRONIZATION
RQ
OSC IN
CLK OUT
4V
+
-
NO EXT SYNC
-
2V
+
EXT SYNC BLANKING
SYNC IN SYNC OUT
VREF
BLANKING
COMPARATOR
3.0V
-
+
+
-
2.50V
-
+
1.45V
36k
OV
UV
VC
GATE
PGND
SYNC
100
4.5k
3
FN9237.1
July 11, 2007