ISL8843 Datasheet, PDF (2/12 Pages) Intersil Corporation – Industry Standard Single-Ended Current Mode PWM Controller

Functional Block Diagram
V_DD
GND
START/STOP
UV COMPARATOR
+
V_DD OK
-
BG ^+-
2.5V
A
A=0.5
V_REF
5.00 V
ENABLE
VREF FAULT ^-
+
VREF
UV COMPARATOR
4.65V ↓ 4.80V ↑
BG
CS
+
100mV
-
PWM
COMPARATOR
5%
FB
COMP
+
-
ERROR
AMPLIFIER
2R
VF Total = 1.15V
R
1.1V 3%
CLAMP
VREF
100K
2.9V
1.0V
100 nS
FALLING EDGE
DELAY
150K
RTCT
ON
OSCILLATOR
COMPARATOR
< 10nS
-
+
CLOCK
8.4mA
ON
SQ
36K
RQ
RESET
DOMINANT
P/N
8843
UVLO ON/OFF
8.4 / 7.6V
VREF
OUT