ISL6721A_14 Datasheet, PDF (3/24 Pages) Intersil Corporation – Flexible Single-ended Current Mode PWM Controller

Functional Block Diagram
ISL6721A
VCC
LGND
ISET
ISENSE
5k
START/STOP
UV COMPARATOR
+
-
VREF
5.00 V
1%
ENABLE
BG ^+-
THERMAL
PROTECTION
RESTART
DELAY
0.8
VREF
+
Σ
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 DCHG ^ON
OVERCURRENT
SHUTDOWN
DELAY
SS CHG
SLOPE
0.1
COMP
SS
SS CLAMP
+
-
VFB
2.5V
ERROR
AMPLIFIE
R
+
-
PWM
COMPARATOR
+
-
1/3
100nS START
BLANKING
SS LOW
-
+
FAULT
LATCH
SS LOW 270mV
COMPARATOR
SQ
RQ
SET DOMINANT
VREF
UV COMPARATOR
4.65V _-
+
BG
VREF
VREF
SS
15µA
VREF
20K
3.0V
1.5V ^12k
30K
RTCT
VREF
OSCILLATOR
COMPARATOR
-
+
1mA
ON
+
4V
-
-
2V
+
ON
Bi-Directional
Synchronization
OSC IN
CLK OUT
NO EXT SYNC
EXT SYNC BLANKING
SYNC IN
SYNC OUT
VREF
SQ
RQ
BLANKING
COMPARATOR
3.0V
-
+
+
-
2.50V
-
+
1.93V
36k
OV
UV
VC
GATE
PGND
SYNC
100
4.5k
3
FN6797.0
August 23, 2011