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ISL1902 Datasheet(PDF) 1 Page - Renesas Technology Corp |
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ISL1902 Datasheet(HTML) 1 Page - Renesas Technology Corp |
1 / 25 page FN7981 Rev 2.00 Page 1 of 25 March 20, 2013 FN7981 Rev 2.00 March 20, 2013 ISL1902 Full-Featured, Dimmable AC Mains LED Driver with PFC DATASHEET The ISL1902 is a high-performance, critical conduction mode (CrCM), single-ended controller used for single-stage conversion of the AC mains to a constant current source with power factor correction (PFC). This controller may be used in virtually any single-ended topology, isolated or non-isolated, including Boost, SEPIC, Flyback, and Forward converters. Operation in CrCM allows near zero-voltage switching (ZVS) for improved efficiency while maximizing magnetic core utilization. The ISL1902 is compatible with both leading and trailing edge modulated AC mains dimmers as well as analog signal and ambient light sensor controlled dimming methods. The LED string may be dimmed either by modulation of the DC current or PWM dimming. In-rush current limiting minimizes current spikes caused by leading edge dimmers and prevents dimmer malfunction when one or more LED fixtures are connected. Two control loops are provided to improve transient response since one loop must have restricted bandwidth to allow PFC. The second control loop may be configured for higher bandwidth to respond to input transients quickly and prevent them from propagating to the load and appearing as flashing/flickering. The ISL1902 LED driver controller provides all of the features required for high-performance dimmable LED ballast designs. Applications • Industrial and commercial LED lighting • Architectural lighting LED drivers • AC or DC input LED ballasts Features • Excellent LED current regulation over line, load, and temperature • 0 - 100% dimming with leading-edge (triac) and trailing-edge dimmers • Analog control signal dimming • Configurable for PWM or DC Current Dimming Control of LEDs • Dual control loops for PFC and fast transient response • Compatible with ambient light sensors for uniform lamp-to-lamp performance • 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 • Active pre-load to eliminate power-off “afterglow” • OFFREF feature sets dimming turn-off-threshold to improve fixture performance matching • In-rush protection control for each AC half-cycle minimizes audible noise and eliminates dimmer resonance • Input or Output Overvoltage Protection (OVP) • Over-Temperature Protection (OTP) • Bias Supply Under Voltage Lockout (UVLO) • -40°C to +125°C operation • Pb-free (RoHS compliant) FIGURE 1. TYPICAL APPLICATION - DIMMING PERFORMANCE FIGURE 2. TYPICAL APPLICATION - POWER FACTOR 0 100 200 300 400 500 600 700 800 0 20 40 60 80 100 AC CONDUCTION ANGLE (%) 0.90 0.92 0.94 0.96 0.98 1.00 80 130 180 230 INPUT VOLTAGE (VRMS) OBSOLETE PRODUCT NO RECOMMENDED REPLACEMEN T contact our Technical Support Cent er at 1-888-INTERSIL or www.intersil.com /tsc |
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