ISL1903EVAL2Z INTERSIL [Intersil Corporation], ISL1903EVAL2Z Datasheet - Page 2

• Manufacturer Part Number: ISL1903EVAL2Z
• Description: Dimmable Buck LED Driver - AC Mains or DC Input LED Driver
• Manufacturer: INTERSIL [Intersil Corporation]

Functional Block Diagram - ISL1903
OFFREF
DELADJ
RAMP
VREF
IOUT
VDD
GND
CS+
OC
AC
OSCILLATOR
MASTER
VOLTAGE CONVERTER
DETECTOR
ISENSE
+
-
LOW PASS FILTER
AC DETECTION
DUTY CYCLE TO
PEAK
CLK
BLANKING
LEADING
REF
EDGE
200mV
BG
-
+
IOUT
DETECTOR
-
+
CRCM
AC-PRESENT
150°C TO 170°C
PRIMARY CURRENT
SENSE PROCESSOR
UVLO
+
-
SHUTDOWN
REFERENCE OUT
OTP
600mV
VERR/5
EA1
VERR
+
-
1/5
QUASI-ZVS
SS/5
PRIMARY OC
CLAMP
DELAY
F
MAX
+
-
-
1/5
+
COMPARATOR
-
GENERATOR
PWM
REFERENCE
BIAS AND
FB1
BIAS/UVLO/OTP
CLAMP
MINIMUM DIMMING LEVEL
F
INHIBIT
MIN
+
-
CONTROL
CRCM OSCILLATOR/PWM/ERROR AMPLIFIERS
PWM LATCH
S
R
Q
Q
PWM
SS
REFINBUFF
VERR
CLK
TRIANGLE WAVE
GENERATOR
REFERENCE
SS BUFFER
+
+
_
DIMMING PWM
REFINBUFF
-
+
VERR CLAMP
INHIBIT
SOFT-START/POR/OVP
REFERENCE SS
-
+
ENABLE
SS LOW
SS
FAULT LATCH
S
R
SOFT-START
Q
Q
+
300ms
-
+
- 1.50V
0.25V
DHC
PWMOUT
OUT
OVP