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Renesas Electronics Components Datasheet

ISL1904 Datasheet

Dimmable AC Mains LED Driver

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ISL1904
NOT RECOMMENDED FOR NEW DESIGNS
NO RECOMMENDED REPLACEMENT
contact our Technical Support Center at
1-888-INTERSIL or www.intersil.com/tsc
Dimmable AC Mains LED Driver with PFC and Primary Side Regulation
DATASHEET
FN8286
Rev 1.00
September 20, 2012
The ISL1904 is a high-performance, critical conduction mode
(CrCM), flyback controller used for single-stage conversion of
the AC mains to a constant current source with power factor
correction (PFC). The controller regulates the output current by
monitoring the primary side switching current so the feedback
signal does not cross the isolation barrier. Operation in CrCM
allows near zero-voltage quasi-resonant switching (ZVS) for
improved efficiency while maximizing magnetic core
utilization. The ISL1904 LED driver provides all of the features
required for high-performance dimmable LED ballast designs
and supports AC or DC input, isolated or non-isolated flyback
and boost topologies. This advanced BiCMOS controller
features all of the functions required to design low cost low
parts count LED driver.
Features
• Excellent LED current regulation over line, load, and
temperature
• 0 - 100% dimming with leading-edge (triac) and
trailing-edge dimmers
• Power factor correction for up to 0.995 power factor and
less than 20% harmonic content
• Critical conduction mode (CrCM) operation for
quasi-resonant high efficiency performance
• Supports universal AC mains input
• Configurable for PWM or DC current dimming control of
LEDs
• Monitors FET switching current for load regulation
• Supports isolated and non-isolated boost and flyback
topologies
• Closed loop soft-start for no overshoot
• OFFREF feature to set dimming off-point to improve fixture
performance matching
• -40°C to +125°C operation
• Pb-free (RoHS compliant)
Applications
• Industrial and commercial LED lighting
• Retrofit LED lamps with triac dimming
• Universal AC mains input LED retrofit lamps
• AC or DC Input LED ballasts
EMI Filter
AC Mains
850
1
VDD
14 DHC
5
CS+
800
750
12 AC
OUT 16
ISL1904
8 DELADJ
OC 6
13 GND
VERR 9
3 VREF
RAMP
10
FB 7
IOUT
4
700 4LEDs
5LEDs
650
6LEDs
600
550
180 190 200 210 220 230 240 250 260 270
FIGURE 1A. TYPICAL APPLICATION
LINE VOLTAGE (VRMS)
FIGURE 1B. LED CURRENT vs LINE VOLTAGE
FIGURE 1. TYPICAL APPLICATION PERFORMANCE
FN8286 Rev 1.00
September 20, 2012
Page 1 of 21


Renesas Electronics Components Datasheet

ISL1904 Datasheet

Dimmable AC Mains LED Driver

No Preview Available !

Functional Block Diagram - ISL1904
VREF
VDD
GND
UVLO
+
-
BG
OTP SHUTDOWN
150C 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


Part Number ISL1904
Description Dimmable AC Mains LED Driver
Maker Renesas
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ISL1904 Datasheet PDF






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