ISL1904 Datasheet, PDF (2/21 Pages) Intersil Corporation – Dimmable AC Mains LED Driver with PFC and Primary Side Regulation

Functional Block Diagram - ISL1904
VREF
VDD
GND
UVLO
+
-
BG
OTP SHUTDOWN
150C TO 170 C
BIAS AND
REFERENCE
GENERATOR
BIAS/UVLO/OTP
DUTY CYCLE TO
VOLTAGE
CONVERTER
LOW PASS FILTER
REFERENCE OUT
MASTER
OSCILLATOR
CLK
TRIANGLE
WAVE
GENERATOR
CLK
DIMMING PWM
-
+
AC
OFFREF
IOUT
CS+
DELADJ
OC
RAMP
PEAK REF
DAECTDERECTTEOCTION
-
+
AC-PRESENT
+
-
ISENSE
PRIMARY CURRENT
SENSE PROCESSOR
IOUT
MINIMUM DIMMING
LEVEL CONTROL
+
-
INHIBIT
REFINBUFF
++_
REFERENCE SS
BUFFER
-
+
CRCM
DETECTOR
QUASI-ZVS
DELAY
FMAX
CLAMP
LEADING EDGE
BLANKING
+
600mV - _{PRIMARY OC}
FMIN
CLAMP
200mV
VERR/5 SS/5
1/5
+
--
PWM
COMPARATOR
1/5
EA1
+
-
SQ
RQ
PWM
LATCH
PWM
SS
REFINBUFF
VERR
CRCM OSCILLATOR/PWM/ERROR AMPLIFIERS
VERR
FB1
INHIBIT
REFERENCE SS
VERR CLAMP
-
+
SOFT-START/POR/
OVP
DHC
PWMOUT
OUT
+
- 1.50 V
SS
300ms
ENABLE ^SOFT-START
OVP
SS LOW ₊
-
0.25V
FAULT LATCH
SQ
RQ