ISL78840ASEH Datasheet, PDF (3/15 Pages) Intersil Corporation – Radiation Hardened, High Performance Industry Standard Single-Ended Current Mode PWM Controller

Functional Block Diagram
VDD
GND
CS
START/STOP
UV COMPARATOR
+
VDD OK
-
+-
2.5V
A
A = 0.5
VREF
5V
ENABLE
PWM
COMPARATOR
+
100mV
-
V_REF FAULT _-
+
V_REF
UV COMPARATOR
4.65V 4.80V
FB
COMP
+
-
ERROR
AMPLIFIER
2R
VF TOTAL = 1.15V _R
1.1V
CLAMP
ONLY
ISL78841A,
ISL78845A
Q
T
Q
V_REF
SQ
36k
RQ
RESET
DOMINANT
100k
150k
RTCT
2.9V
1.0V
ON
OSCILLATOR
COMPARATOR
<10ns
-
+
CLOCK
8.4mA
ON
V_REF
OUT