ISL6721ABZ-T Datasheet, PDF (2/22 Pages) Intersil Corporation – Flexible Single-ended Current Mode PWM Controller

ISL6721
Functional Block Diagram
VCC
LGND
ISET
START/STOP
UV COMPARATOR
VREF
5V
1%
+
ENABLE
-
BG ^+-
THERMAL
PROTECTION
RESTART
DELAY
0.8
SS CHARGE
VOLTAGE CLAMP
SS CHARGED
SOFT-START
CHARGE 70µA
CURRENT
ON
OVERCURRENT
SHUTDOWN
DELAY
25µA
+
-
4.375V
ON
ISENSE
5k
SLOPE
VREF
+
S
53µA _{+ 100mV}
0.1
COMP
SS
SS CLAMP
+
-
VFB
2.5V
ERROR
AMPLIFIER
+
-
- OC DETECT
+
OVERCURRENT
COMPARATOR
Q
Q
50µs
RETRIGGERABLE
ONE SHOT
SQ
RQ
OC LATCH
SS LOW -
+
SS LOW 270mV
FAULT COMPARATOR
LATCH
SQ
PWM
COMPARATOR
+
-
1/3
100ns START
BLANKING
RQ
SET DOMINANT
VREF
UV COMPARATOR
4.65V _-
+
BG
VREF
VREF
SS
15µA
VREF
20k
30k
RTCT
VREF
3.0V
1.5V ^12k
ON
OSCILLATOR
COMPARATOR
-
+
1mA
ON
BI-DIRECTIONAL
SYNCHRONIZATION
OSC IN
CLK OUT
4V
+
-
NO EXT SYNC
-
2V
+
EXT SYNC BLANKING
SYNC IN SYNC OUT
VREF
SQ
RQ
BLANKING
COMPARATOR
3.0V
-
+
+
-
2.50V
-
+
1.45V
36k
OV
UV
VC
GATE
PGND
SYNC
100k
4.5k
2
FN9110.6
March 5, 2008