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ISL1904 Schematic ( PDF Datasheet ) - Intersil

Teilenummer ISL1904
Beschreibung Dimmable AC Mains LED Driver
Hersteller Intersil
Logo Intersil Logo 




Gesamt 21 Seiten
ISL1904 Datasheet, Funktion
Dimmable AC Mains LED Driver with PFC and Primary
Side Regulation
ISL1904
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)
Applicationswww.DataSheet.net/
• 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
700 4LEDs
5LEDs
650
6LEDs
3 VREF
RAMP
10
FB 7
IOUT
4
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
August 10, 2012
FN8286.0
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Datasheet pdf - http://www.DataSheet4U.co.kr/






ISL1904 Datasheet, Funktion
Typical Application - Dimmable Inverting Boost-Buck (Single Winding Flyback)
DIMMER
AC
MAINS
EMI
FILTER
1 VDD
OUT 16
2 OFFREF PWMOUT 15
3 VREF
DHC 14
4 IOUT
GND 13
5 CS+ISL1904 AC 12
6 OC
OVP 11
7 FB
RAMP 10
8 DELADJ VERR 9

6 Page









ISL1904 pdf, datenblatt
ISL1904
Electrical Specifications Recommended operating conditions unless otherwise noted. Refer to “Functional Block Diagram -
ISL1904” on page 2 and “Typical Application schematics” beginning on page 3. VDD = 17V, RRAMP = 54kΩ, CRAMP = 470pF, TA = -40°C to
+125°C, Typical values are at TA = +25°C; Boldface limits apply over the operating temperature range, -40°C to +125°C. (Continued)
PARAMETER
TEST CONDITIONS
MIN MAX
(Note 7)
TYP
(Note 7)
UNITS
Unbiased Output Voltage Clamp
Frequency
VDD = 6V, ILOAD = 3mA
- - 1.9
291 320 349
V
Hz
Maximum Duty Cycle
REFIN = 0.5V
- - 100 %
Minimum On-Time
REFIN = 0V
- - 0.5 µs
OVP
OVP Threshold
1.46
1.50
1.54
V
OVP Hysteresis
10 20 27 µA
Input Bias Current
-1.0 - 1.0 µA
OVP Clamp Voltage
THERMAL PROTECTION
IOVP = 1mA
5.4 - 7.0 V
Thermal Shutdown
(Note 8)
150 160 170
°C
Hysteresis
(Note 8)
- 25 - °C
NOTES:
7. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization
and are not production tested.
8. Limits established by characterization and are not production tested.
Test Waveforms and Circuits
8V
1 VDD
OUT 16
2 OFFREF PWMOUT 15
3 VREF
DHC 14 0 TO 1V 120Hz
4 IOUT
GND 13
ISL1904
5 CS+
AC 12
6 OC
OVP 11
1nF
7 FB
RAMP 10
8 DELADJ VERR 9
5k 470pF
www.DataSheet.net/
OUT
OR
PWMOUT
tR
90%
10%
tF
54k
FIGURE 2. RISE/FALL TIME TEST CIRCUIT
FIGURE 3. RISE/FALL TIMES
12
FN8286.0
August 10, 2012
Datasheet pdf - http://www.DataSheet4U.co.kr/

12 Page





SeitenGesamt 21 Seiten
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